CHEAP IROC-Z 10 Bolt Upgrade + RPO Codes/Axle Tags Explained!
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- Опубликовано: 22 авг 2024
- In this video, we go over buying and decoding the perfect 10 bolt rear end for the 1986 IROC-Z Camaro!
The new rear end is out of a 1991 Z28, and has GU5/G92, and G80 RPO Codes, as well as the preferred PBR (J65) rear disc brakes. It's a PERFECT setup, and I was lucky to find it.
Stay tuned for more! The next videos we will again be working on the cars!
Axle Code Information:
www.thirdgen.o...
FAQ about 10 Bolts:
www.thirdgen.o...
This information is applicable to the third generation (1982-1992) Pontiac Firebird/Trans Am/Formula, and Chevrolet Camaro RS/Z28.
Watch more videos in the Iroc-Z series below:
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Fixing & Cleaning up a NASTY Iroc-Z! SAVE & BUILD or SELL it?
• Fixing & Cleaning up a...
Transforming a MOLDY IROC-Z Camaro CHEAP + Fixing it up!
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Buying the Barn Find Iroc-Z:
• I Bought A DISGUSTING ...
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I found good deals on a couple of good used parts for this car and saved a ton of money! I'll get to working on the car next. I have plenty to do now!
Sorry can I ask are you doing budget build?
This was one of the best things I did for my 83 Camaro. I switched from 3:08 to a 3:42 1997 TA 10 bolt with limited slip and disc brakes. Also went with 1989 Corvette "salad shooter" aluminum 17" wheels, fills the wheel wells and steps up to 17" wheels, and fits perfect. Massive improvement in driving / stopping.
I am here just following the build and learning. I have always wanted a 3rd Gen. Great videos
Welcome to the channel! Hope to have some good info on here for you guys.
My 1990 IROC has G80, G92, and J65 RPO CODES.
This makes the car super rare as the limited slip, with the performance gear ratio and 4 wheel disc breaks was a 1LE standard, but rarely ordered on non 1LE cars
That's a good combo of options! Auto or manual trans car?
Nice, I did not know that. My 92 5.7L N10 Formula has those three codes (G80, G92, J65). Good to know.
My 90 is the same t5 3.42 g80 g92
@@claypaul2012 sweet. That's as good as it gets IMO. I think just the middle-earlier third gens were available with a 3.73 ratio if I'm not mistaken? You have a good combo.
@@Toyaddict81 FYI - I've read somewhere that if you had G80, J65 brakes were mandatory. Dont quote me on that but it might be a thing. I'd have to find where I read that again. Could be wrong.
1:46 I did that and to my surprise...I couldn’t be any happier. Nah in all seriousness though, epic opening. Keep up the great work!
This is the kind of videos I live for. Cool cars, footage of them running and burning rubber with some metal in the background at a reasonably low volume (just so I can hear the engine roar). Great video dude. Fuckin' A.
Thanks bud. The garage burnout is a rare moment, but it felt right lol. Glad got enjoyed the video.
If it feels right, it's sometimes always probably right. 34,23% of the times at least. Yep.
I had a 97 Frankenmaro. It was probably five Camaros parted out to make one. No wait, it was four Camaro parts cars and a WS6 Trans Am. I put the Trans Am WS6 factory 3.73 geared rear end on a V6 Camaro. The exhaust you got will work wonderfully for your car! I wouldn’t worry about the booger welds too much nobody will really see them and you can get a sleeve made to put the two pieces back together using a muffler clamp or weld it back together. It will be better than what you have and sound awesome! Not that you need me to tell you that. You have a great build and I’m glad to see I wasnt the only one who swapped the rear end for posi-traction and rear disk brakes!
Just bought a 92 rs its a little rough, but will make a great toy. This series has been very useful, and now you have a new viewer. I will be watching the rest of your videos. Right now though keep the 3rd gen stuff coming.
Great video. I like seeing third gen IROCs being restored as they becoming more common now. I have an 89 IROC-Z , original owner and I'm starting to work on it again. Great info on the rear axle. I'll check the RPO code to find out what gear ratio I really have. All I know is that I do have a limited slip differential. Keep these videos coming on the IROC!
Sweet! Your RPO codes should tell you exactly what rear gear ratio your car has whether it be a manual or automatic transmission Check out the Tech Board on Thirdgen.org. Your info will be listed under the "1989 Camaro" page.
That decoding stuff is awesome cant wait to see it all together
Sweet. Glad you stuck around to check it out! Hope some of that helps people out. Theres links in the description for people to check out.
Finally a new exhaust for this car, can't wait to hear how it sounds when it's done....Headers yes, would like to see the installation process and hear your knowledge on headers. Been enjoying the IROC videos. I have a 87 GTA myself.
Been waiting for the right stuff to pop up. I'll figure out what to about headers and a y-pipe next. I only want to do it all once lol
Keep doing what you’re doing!! Finding deals on parts is half the fun in my book and decoding what you find will just help the next guy ......
Agreed! That's a lot of the fun. Being able to find deals on parts is awesome and a great way to save some money.
In the garage. Full send. 👍🏻
Good to see the camaro receiving some upgrades. Finding that 10 bolt was a nice find. RPO code on mine says 3.42 but after watching this video, I'll definitely want to confirm.
Your RPO codes should tell the tale if anything. If it says you have a 3.42, you probably do or should. They just don't seem to be nearly as common as taller gears.
Unfortunately, mine are paired up with drums. Looking forward to swapping those one day.
Only just found your channel with this 3rd gen Iroc build. Love seeing all aspects of the build
Sweet! More videos to come on it. It needs a lot of work, so there's no shortage of content to make lol
Love the intro garage burnout lol
Man it looks cold over there. Anywho Parts collecting plus 🔧wrenching on it keep up the great work
Winter time here. The snow and cold is a bummer, that's for sure.
That is a great upgrade for the IROC, those gears will really wake it up and you get the good brakes with everything going together like factory. I just painted my rear axle with POR 15 two weeks back, was not bad at all even on the car. If you do POR 15 just remember that stuff needs something to bite into and doesn't like smooth surfaces but they say the metal prep helps with that, I did the 3 step process and it looks good. I am also looking forward to the headers install.
Interesting, I didnt know that about por15. I'll keep that in mind if I go that way. Thinking I'll end up bead blasting the housing first, so maybe something like an enamel paint would be better in my case?
@@Greenlightfilming In the instructions rusted metal is best but sand blasted is considered good as well. I noticed on my axle that the few smooth/not rusted areas needed more paint and you could feel it not biting as well as on rust. Also the POR15 starter kit for like $25 will have almost enough for the whole job, I had a leftover 14oz can that I used a little from to finish the second coat which also goes much farther than first coat IMO. That metal prep spray would be key on non rusty surfaces. Maybe check out Eastwood chassis paint as well?
3.23 was stock in my 91 gta, I put a 3.73 in and it woke it up! speedo is off by about 10-15 mph on the highway
Yep! That's a pretty big change as speed increases.
This video is real similar to what I’m getting ready to do. I have a 91’ RS that I’ve LS swapped and now getting ready to get rid of the open diff 3:08 gear rear for a G80 GU5 rear from a 99 firebird. I got the complete rear with disc brakes for $100. I’d like to take the LSD diff from the 4th gen rear and just swap it into the original 3rd gen rear to keep the correct width, but I’m for sure if it can be done yet.
Nice job on the IROC , glad to see you are bringing it back to life. I need to pull the 10 bolt in my 00 SS and replace it before spring
That's not all that big of a job once you get started. That usually seems to be the hardest part for me lol
You are correct, 10 bolt can really be a weak link when you start adding HP. But I think it will be more then able to handle that car unless you really start doing some big mods like more cubes and or FI. I ditched the 10 bolt in my 97 Comp T/A ages ago for a Moser 12 Bolt with 4:10 Gears, 33 spline axles with a c-clip eliminator kit. Rear end had a full spool for a while but it lost its novelty and I got tired of people telling me there was something wrong with my car during slow speed turns. Even had a "Mechanic" at an exhaust shop who installed my WB 02 Bung because my welder was down try telling me. "Something is wrong, it feels like your rear end is binding up. When I pulled your car out. You might want to have that looked at." He looked at me with a blank expression when I told him it has a full spool. Then repeated what he just told me like he thought I didn't know what I was talking about. At any rate because I'm more into canyon carving and road course racing (Work for a Pro IMSA Race Team) I ditched the full spool in favor of a Moser Detroit Trutrack and have never looked back. That thing is a Monster of a LSD
I had a Flowmaster muffler on my old lt1 z-28 Camaro and it sounded great. Different engine of course, but you should love it.
I've been digging up dirt and rock to get to a water main in my front yard with a shovel and hands for the last five days in a T-shirt. I actually put the a/c on in the truck yesterday. My Quick Jack arrived yesterday.....be some time before I put it together.
I’m absolutely certain you have corrected your self on all 85-92 f- body 10 bolt
I have an 87 350 and put a set a 3:70‘s in the back and wakes up the whole car!
Gears really do make a huge difference in a car!
You can get 350 up to 410 gears with limited slip deferential or Detroit Locker if you really want it try it
I'd consider getting something like a 3.73 gear set for the car. Want to keep the RPM's down on the highway.
Great start to the video, mad.
Im gonna check my cars axle tomorrow. 😎
Grat video, like the Firebird. Lots of information. Help's me working on my 3rd gen Firebird. Keep up the awesome work!
Sweet, thanks man! Glad it's helping you out. If anything hopefully it's some entertainment.
As always brother you delivered!!!! That was a good idea switching out the whole rear end!! You save a lot of money there!! The POR15 will be a nice touch once you sand her down. I am excited about this particular project! It going to be cool!!!!😎
Thanks man, appreciate it. I'll end up blasting the whole axle housing and finishing it something like that. Hope it saves money in the long run lol
Love seen the parts hunt. We all do it, and it’s exciting to me. As far as the exhaust, definitely massage it in to place. And if you are welding, just mount it a bit highest in the rear, get some 3’ ninety degree elbows and weld them on to make new tips. They point down and are hidden behind the rear bumper. Kind of like the early camaros.
That's an excellent suggestion. The tips are the biggest thing I hate on these kits. I'll look into that, thanks for the tip! I'll be making it all fit anyways. The tips are no biggie
It's helping me with my 3rd gen with thinking of ideas to do to it
Glad to hear that
Limited Slip Deferential is a great upgrade either 10 bolt 8.2 or 8.5 or 12 bolt GM Rear end or even 9inch Ford Rear end since most people who want to use it
I never realized how big a difference the gear ratio makes until I went from a 3.23 in my 88 to a 2.73 in my 97. Even with 40 more hp, the 97 always felt like a dog. Looking forward to seeing this swap and the "new" exhaust.
It's a huge difference. When people go from a 2.73 to a 3.73 it has to feel like 100hp haha
Jesus Christ just re-weld it tac it in place Pull it down and re-welded you got this brother
4th gen rear will bolt up but are a little wider. Also 4th rear gen rear disc setup will bolt on a 3rd gen rear disc.
you got a like from the burn out lol lol
Not my most mature moment but it felt right. Thanks bud lol
Good luck reading the codes. They’re dot peened on the forward side of the (passenger?) axle tube near the pumpkin. They’re very faint and with the rust you have they’re most likely gone. I could barely read my 1990’s axle code in 1998 and it’s been garaged since new with no winter’s.
I have 87 iroc with a carb thank for the info
No worries, thanks for checking it out!
I found a posi rear end at a salvage yard a few years ago and it a strange set up it was only produced one year 1988 the strangest thing about it the disk brake are pointing in opposite directions and you can not find the calibers anywhere. So I had to have a them rebuilt.
I personally pull the cover off of every rearend I do, count the teeth, and do the math. That way you know exactly what you have. I have rebuilt hundreds of rearends, and changed the gear ratio in probably 40% of those, so the code on the tube would be worthless. 1989 was the change over year. My son's has 26 spline, and my cousins has 28 spline axels. I put 3.42's in both of them. My son already grenaded his 700r4, so I'm waiting on him to blow that 7.5 10 bolt all to hell, then we'll put a 9 inch in it. Keep that exhaust you bought. New aftermarket 3rd gen exhaust is getting scarce.
Maybe you'll know this then. That number I referenced on the ring gear. Those are the number of teeth on the ring and pinion right? That's the same numbers you would get manually counting them?
@@Greenlightfilming Yes. Most GM ring gears on the automotive rearends have anywhere from 39 to 41 teeth on them. A 41 tooth ring gear and 10 tooth pinion would be 4.10 gears. Ring and pinions must be kept as a set. Never mix and match. They're 'lapped in' at the manufacturer.
I just service my differential a couple months ago and painted the diff cover red to go with my car red n black theme it definitely makes da rear end look much better,u could paint ur cover white or maybe silver to go with the Iroc door decals just a suggestion
I'll probably paint it black like the rest of the rear end housing if I dont score a used TA cover with girdle studs. I forget what they are called. Lol
@@Greenlightfilming That works too,keep up the great content brother loving the direction of the channel
Great video, man! epic garage burnout! I'm living on a prayer on my 9 bolt....big decision this year which way I go.
Maybe ride it til its broken? Idk, just thought. Some guys have great luck with them.
@@Greenlightfilming yep! I can certainly appreciate that strategy! Probably fine until it sees slicks or dead hooks lol
8.8 ford ...
I upgraded the differential in my 92 RS with a Zexel Torsen unit from a 4th gen SS. I later upgraded the brakes with an LS1 disk setup and changed the spring inside the proportioning valve with a heavier spring so the rear brakes engage sooner. Couldn't be happier with the setup especially with C5 big brakes in he front. The calipers for the front are from a 2006 GTO which are essentially C6 calipers minus the raised Corvette logo. Upgraded the lines to Kore3 braided steel all around. The difference from stock is night and day. The 10.5" stock front brakes with rear drums are a joke IMHO. Should never have been equipped with the from the factory PERIOD.
Its anecdotal, but I went from a 3.23 to a 3.42 in my 00 z28 and couldn't tell a difference beside my tach being slightly higher. Especially because it's a manual car I'd put at least a 3.73 in it minimum if not a 4.11. As far as coating the rear end, I'd look at some VHT wrinkle black, if the one I bought wasnt already painted silver that's what I would have used and still wish I would have taken the time to do.
Yes, parts finding and decoding. Also just curious to see what you will do with the exhaust system?
I'll probably change the tips and fix it up. Looking for the right headers/y-pipe too.
I am looking for another 92 (25 th anniversary) edition rs
Good deal. Check out the third gen pages on Facebook. They pop up once in awhile on there as long as you are willing to travel.
I love your channel and by the way, I do a burnout in every garage I own.
The proper way to christen a garage
Cool video!! I got a 92 Z28 with the same axle so I'm looking forward to seeing you in stall it and thanks for the info its a big help. I had to put new brake calipers on my and i don't know if you know this or not but the e brake springs on the calipers are a pain in the but to take on and off well aleast it was for me.
I've heard the ebrake springs are a pain in the butt to work with. The axle swap itself is very straight forward. In this case, I'll have to do some work with brake lines which isnt the end of the world.
I think $500 was a steep price for a stock 10 bolt even if it had the brakes (9 time out of 10 if it came with brakes and its been sitting for a while the calipers are frozen which just adds to the cost )
a better route could be a 4th gen rear.. there super cheap maybe $250 or less for a complete rear and easier to find (93-97 they use the same brake set up and pop out the ring and pinion gear for the limited slip unit and swap over your gear set a little more work but cheaper ).
That said:
Over the years everyone wants the 3.42 rears but , the 3.23 rears from the auto cars are a better deal one because the autos don't send a ton of shock wave through the rear ... also the 3.23 rears are stronger due to the thicker ring gear. also you have to beware of the different limit slip units used over the years some are the clutch style and some or the strange setup with the weights i forget whats its called but those units are junk
I did feel that the price was on the high end given its overall condition, I agree with you there. That being said, it's a perfect platform to clean up and swap into the car.
I had considered a 4th gen rear, but hate how a third gen looks with a 4th gen rear in it. Wheels poke and I dont like it at all. They are way more affordable and much easier to find. The are no stronger than this one as they are pretty much the same with 28 spline axles and having and Auburn LSD. I believe its shared in 1993-1997 cars too. If I can find a good 98-02 Zexel Torsen I will use it because it's should fit my axles and carrier being it's a 3.23 ratio.
I think the oddball you are referring to is called a "Gov Lock" or "Government Lock"? Think those are on earlier cars and more prone to breaking. This rear has an auburn diff.
As far as the brakes go, the previous owner drove it. I have photos of the rotors being pretty clean before he parked and pulled it. Might get lucky there. Might need replacements, idk haha. Hoping for the best there.
@@Greenlightfilming yes the goc lock omg what junk lol lol parts from the 93-97 (brakes and internals are the same and can be used in the 3rd gen housing (keep your ring gear and use the limit slip unit from the 4th gen just stating this for anyone who is looking to do the same as you who can't find a good 3rd gen rear .. good channel keep up the good work
Oh ok I see what you mean now. In the back of my head I'm thinking if doing what you recommended with putting 4th gen stuff on this housing.
You went to manitowoc for third gen parts? See plate in your corvette wisconsin im about 25min north of Milwaukee nice to see videos from someone local
Nice video good info, you really did your homework.
I did a good amount. Always more to learn about this stuff. I just scratched the surface to figure out what's is best for this car and my situation
A 323 is a good gear for what you have I think it will be a plus bc of that t5 with a 350. Yes sir you going to have a nice set up.
That's sort of the aim I've got for the car so far. Hoping to make it the perfect drivers car with the right combination of parts.
@@Greenlightfilming hey you making it a nice ride. Any upgrades are better than it once was. Your doing a nice job on it. Keep up the good work.👌👍 I look forward to future videos.
Oh yeah
👍👍👍
Every time I watch his videos I wish I never sold my 85 iroc 😭
I believe that, I looked at about 20 third gens over several years, looking for one with NO RUST, but I finally found my 83 cheap, and UN-molested all original, with the short lived GM plastic hood. Now slowly on to the proper resto-mod. God I love these cars.
PS. Keep up the trans am videos!
I've got one coming soon
What mods would you recommend for a 1989 IROC-Z 5.7L
Being it's an automatic car, I would recommend headers and a higher stall torque converter. If you are street driving the car 99% of the time I'd probably just stick to headers. It take a LOT to wake up the TPI cars unfortunately. It all depends on your budget and goals at that point.
you have done well. a bit corroded, but lol, i am in CA. anyways, if you want a quick car, ditch the 3.23 ring & pinion for a 3.73 or a 4.11
I have 2 73 LSD with drums those breaks were a pain shoes EZ not having the tool for the wheel cylinders clips 30min job turn into 2hrs of cussing the front was 1 hr new rotors bearing calipers and lines pads. I wish you much luck man it going to be nice grocery getter when you're done
Hoping so! Sorry to hear you had such a battle with your car. Theres been many times I've had to walk away from stuff like that haha.
@@Greenlightfilming yeah it having cooling issue I've changed pump thermostat may need a radiator it's has Flo it'll collapses the upper and lower hose with rpm so I think the radiator is clogged keep in mind I put maybe 600 miles on it after the brake job that was in October but it's been sitting for 6 year so it to be expect it
Looks like it has a lot of miles
Oh, it was driven.
Are you just smoking the clutch in the opening shot?!
Um, no lol. That's tire smoke
at first I saw the thumb nail without reading the title and said oh he's Seafoaming the motor...
Lol! I can see how you would think that. I should probably do that to the engine to be honest
@@Greenlightfilming through the pvc valve vacuum hose, bet people will think your garage is on fire...
Imagine... My 91 formula with the R6P package came from from the factory with the g80 rear disc, 3.42:1 r posi axle. I feel so superior lol (╭ರ_⊙ )
You're gonna roast your clutch, transmission, breaks and rotors. Nice burn out though.
Lol, it was worth it. Gotta make some memories in life. Luckily it's all replaceable!
You need to put 3:42
I think it had a 3.23 in it. I can't recall without looking back at the first video ha.
Headers! Do it! ☺️
I'm having some trouble deciding on what's going to work with this car the best. Any idea if pre-86 cylinder heads are any different than the 86+ stuff for headers?....
@@Greenlightfilming not sure if cylinder heads are different. I wouldn’t think so.
I know the valve cover bolts differ, just don't know if the heads do. I should send you a pic of the #8 cylinder manifold bolt. It actually goes "through" a flange of some sort. Its bizarre. Doeant go into the cylinder head. Maybe it's an LG4 thing?.... idk
@@Greenlightfilming Any 3rd gen header will work. The exhaust bolt spacing and height never changed on the small block. An extra hole was added during the smog years, but is irrelevant. I put Hooker headers on my son's, and used a Doug's headers Y-pipe. The headers have a 3 inch flange, but the Y-pipe is 2 1/2 at exit. Everything bolted right up and aligned right up with his 3 inch intermediate pipe. I had a piece made to connect them together.
Go.3:73 for the iroc!!
I'm considering that. Not sure it's worth the cost at this time. If I go with a t56 down the road the gears will be shorter.
3:42 3:42 3:42
All cars have open differential including the 80's cars
wrong
342 or 373
Those would be good choices for sure. I'd lean towards a 3.73 if I do a gear change.
All 7.5"/7.625" GM 10-bolt rearends are GARBAGE.
I've never broken one, and really beat on a dozen of them.
@@Greenlightfilming Yeah right...
What a child....
Lol, yeah......