How to Regear your jeep XJ/JK/JL/JT/ZJ/WJ
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- Опубликовано: 30 янв 2025
- Works for jeeps and all axle setups
we made a video to help Jeep owners make the right decision.
What Does a New Set of Gears Do?
One of the most common modifications done to Wranglers is installing a lift kit and a larger set of tires. Something many people forget about when they install a larger set of tires is the drivetrain was geared to provide a balance between torque and top speed. When it comes to gear ratios the higher the number the more times the driving member needs to turn. For example, the first gear on an AX-15 transmission has a gear ratio of 3.83:1 and fifth gear has a gear ratio of 0.79:1.
Gears with lower numbers are referred to as taller and higher numbers are referred to as shorter. Taller gearing provides a higher top speed and better fuel economy while shorter gearing provides more low end torque and better acceleration. Taller gearing is better for daily driving especially if you are planning on doing a lot of highway driving or are simply going to run small tires. Shorter gearing is needed for large tires and also aids in rock crawling by increasing low end torque.
How Does Gearing Work?
The gearing of your axles is set by the number of teeth on the ring and pinion gears. This determines how many times your driveshaft will have to rotate to spin the wheels once. A 4.10:1 gear ratio, for example, would mean that your driveshaft would have to spin 4.10 times to spin the wheels once.
The stock gear ratio tends to vary depending on the year and package your Jeep has. Some of the possible ratios include 3.07, 3.55, 3.73, and 4.10. Wranglers that are equipped with the Rubicon package typically come with the 4.10 gear set in their Dana 44 axles. The chart below shows the relationship between gear ratios and tire size. The numbers across the top are gear ratios, the numbers down the left side are tire sizes in inches, and the 4 digit numbers in the white boxes show RPM.
Why Should I Regear?
If you do a lot of highway driving on small to mid sized tires, it may be practical to regear to a taller setup to increase your top speed and fuel economy. If you are planning on doing a lot of off-roading or are only upgrading to a larger set of tires, you should probably install shorter gears.
When larger tires are installed, you have several things working against you: the diameter of the tire, rotational mass, rolling resistance, and the added weight of the tires. The diameter of your tires directly affects how hard your drivetrain has to work in order to move the vehicle, what you need to keep in mind is the axle is going to be turning your wheels. The axle shafts are just over an inch in diameter, and they have to turn whatever tires are on your Wrangler. This means that with a 30 inch tire you need to apply 30 times more force to the axle in order to turn the wheel. By regearing to a shorter gear, you will increase the amount of force that is being sent to the axle, this allows your Jeep to move the tires with less of a strain on the engine.
How Much it Costs to Regear Your Jeep
Replacing your Jeep's ring and pinion gears is more than simply purchasing a ring and pinion set. There are a number of bearings, seals, bolts, and the differential cover gaskets to worry about. If you're replacing the gears in both front and rear differentials, your overall cost will be understandably more. An entire gear overhaul kit will run you anywhere from $600-$1,200.
Certain differentials can only accommodate certain size ring gears. Generally, the higher numerically you go in gears, the bigger the ring gear. Should you need to upgrade the differential's carrier, this is the time to decide if you want to upgrade to lockers. No reason to do the work twice should you decide on lockers later. A new differential carrier will run about $700-$1,000.
Labor will always vary by region and shop, but you expect a ring and pinion gear installed to be approximately $500-$700 per axle. The being said, a complete regear job is several thousand dollars, done properly.
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Thanks! Did my first gear change 3.07 to 4.10! Took my time; very happy with results. Many thanks for your great guidance, thoughts & videos!
What tire size do you run and how does it feel on the road/hiway now? I have stock 3.07 still on 33s, was planning to go to 4.56 but not sure if that's overkill for a DD
This video is excellent, I’ve watched a bunch cause I’m getting ready to re gear a Dana 44 in my 66 F100. Your video gets right to the point. Information is well explained and will be a great help. Thanks.
You made this look easy, but I really want to regear my JT xD. Got some 35's on it and I need that 4.10 lol.
It’s not bad at all just time consuming
I did this once and swore never again... Well now I've got an lsd for my dana 30 and I'm rethinking it lol. Good video's, I wish they existed when I was doing this the first time.
It wears you out but in the end it’s worth it
I'm running 235/15 tires now and was wondering how low of gearing I can and still use my lunchbox locker????
Do you have lift.
Great video. Does heating the bearings damage them at all?
Isn’t that pinion marked from the factory with the depth measurement? A straight edge and caliper seems like it would have been easier. Then you can get the pinion in and set. Then move on to the carrier.
Love the vids man!!!
Where do you get the shims for behind the inner pinion bearing race? My kit only has pinion head shims.
I hope you see this and answer 1991 xj dana 30 hp does it have a crush sleeve or not if cant find any real data some kits pictured have a crush sleeve some don't I betting there using stock photos I would like to know for sure so I can buy a eliminator
Edit i called a few places and older xj/yj dana 30 hp uses shims no crush sleeve
Hi Ronnie can you please 🙏 tell me what gears I should run on a 2000 XJ automatic & with 33” tires and I can tell you mainly on road use & I will never go any bigger on the tires thanks 🙏
Use this equation: (New tire diameter / Old tire diameter) x Old gear ratio = new gear ratio. So, my Jeep currently has 33" tires on it. The OG tires were approximately 27", and the original gear ratio was 2.73. So, the equation set up is (33/27) x 2.73 = 3.34. Match that "new gear ratio number to the closest gear set ratio available (round up) and you'll bring your Jeep back to (close, at least) original specs. So, I could go with 3.31, but I ran a little higher and went with 3.73. Just my 2 cents, others might have different opinions.
Where do you get the new carrier? I have a JK 2012.
Thanks for the info. How come you didn’t include patterns in the vid?
I have a separate video on patterns and what’s right and how I run them. If you wanna see the pattern I got it’s on my Facebook
I have a 99 cherokee aw4 trans with 4.10 gears running 33s. Do you think it's worth it to regear to 4.56?
Do you high way drive to you plan on going 35s?
@Cherokee Ronnie So it's not a daily driver, more of dad wagon/weekend warrior for trails. I don't do hardcore stuff like rock crawling but more intermediate trails. I do plan on adding lockers. I plan on a few long trips like to go up to moab but not difficult trails. I have 4.5 in lift with 33s and I know 35s would probably benefit me more, but with the new 33s I just got and the amount of time I actually drive it will probably take years before there worn down. I bought the jeep used and thought it had stock gearing, but when I inspected it, it ended up being 4.10s. So I didn't know if I should spend more money and regear again.
I wish the rear end was exactly the same on Cherokee that what you just take the shims out-of-the-box of slapping in the rear end
@@ky0611what size rims and tire do you run.
@@nathanmccumber8965 15x8 wheel on 33s by 12.5 tires
Doesn't tightening pinion nut (with crush-sleeve) require an INSANE amount of torque -- nearly 300 ft-lbs? How did you accomplish this?
Started with a impact rest with a torque wrench
@@cherokeeronnie video shows a LARGE needle-type torque wrench (100 ft-lb & more). Don't you need a SMALLER one, to check for 16-20 in-lb..for pinion pre-load?
It’s in inch pounds I use this one because I use it for other stuff but the one I recommend that works way better and for beginners is in the video on my channel. I been doing gears for awhile I know what the drag is supposed to feel like anyway
Would you be interested in doing another one? I live kinda close by,at the lake in maryland, my jeep is 5 speed 98 4.0 think its dana35
@@kyleradtke4190 the dana 35s are notoriously weak and probably not worth putting a lot of money/time into. You'd be better off just replacing the axle with a dana 44 or Chrysler 8.25 or a Ford 8.8 maybe. You could potentially find one that already has the right gearing/locker that you want anyway.
But if you don't plan to offroad much or run bigger tires then the dana 35 is fine.
Needs more info on how to adjust for pinion depth etc.
Watch the whole play list I explain
This seems hard. I’m not mechanically inclined, though I want to learn
Is that a 4 lb dead blow hammer?
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