The pedal on a diesel isn’t a throttle, its a speed selector. The pedal position tells the governor or ECU in your case what RPM to run at, and the gov/ECU controls the fuel to achieve and maintain that commanded RPM. You halved the final ratio, so you halved the engine RPM and pedal position necessary to maintain a given speed. At 30K, your gearing should be delivering ~13,400# of thrust from the tires. That should be enough to pull you up 26.5 deg in first gear at peak torque. Your performance would be ~10% better with the original diffs Driving an engine at greater than peak torque RPM is like driving with an exhaust brake on. Thats where a large chunk of that 37% fuel increase is coming from, and why most report that their fan rarely cycles, you no longer have all that excess fuel burn heat to dissipate… great video!
I would like to see the engine rpm and speed displayed together while driving in top gear. I subscribed. Thank you for the good information. This is Korea.
NICE! My 1083 will do at least 83 mph. Yeah it was stupid...but somebody had to do it. And I have not heard the BIG FAN since I installed the hubs. The truck is SO much more user friendly. Also, I talked to an Allison tech and he says he can reflash the TCM to start off in 1st gear. Which would be really helpful. It's on the list...
Coming from a 4x4 off road background I can say the benefit of gear reduction hubs is that they reduce the torque applied to the driveline from large dia tires. So doing this will double the torque on the differentials and ujoints and transfer case. This will also cause the engine to actually lug below the PowerBar and likley increase your fuel milage. This would only be a benefit if in most driving situations you find that your engine is reving at the top or above recommended rpm range on road. My worry will be breaking drive axels or ujoints when offloading in low range as they are now being asked to do double the load they were designed to do. But I doubt you would actually drive your litteral house as hard off road as the vehicle is capable. CHEERS AND SAFE TRAVELS Steve h.
Thank you for your comments. I suspect you are right, and also right I probably won't test it to the extremes. Did do some way more aggressive off road this week that I had planned to do and it held up good.
This is great. I have been on the fence about converting my A1, 1078 with hwy gears and been waiting for someone to do it first. Thanks for documenting the process and the final in-depth review.
Just binge watched the entire series. Absolutely fantastic! I am curious if you are willing to share how much your total (beginning to end) cost for the entire build is? This seems right up my alley. Something I am interested in doing myself.
Very cool Michael. Great video and information. It looks relatively easy and straight forward as I’m sure it took a few to where it made it that way. All of those machined parts I can see why it was $3,000. I’m assuming that’s for all 6 hubs. Thanks for sharing with us and taking the time to
Great video with detail. I am not convinced the eco hubs are for me due to my 307 gear change and 14R-20 tires and lower hop 3116 engine. But I would love to have that fuel efficiency gain.
Hey Mike I just finished binge watching all the videos in this series. I am impressed with your truck and all the work you did. it turned out fantastic. On your in cab video, you showed the AC center console. Did the folks you bought the truck from install the AC or did someone else and is the AC system of the installers design? You mentioned you're not a mechanic in this video and you weren't sure of the reason for the shims etc. That's okay I think I can explain if you'd like. If you remove the shim, you'll notice a nut behind it. That's the wheel bearing nut and like on most cars they use a cotter pin to keep the nut from backing off. In this particular hub, it used the 2 pins and inner gear that you removed to keep the wheel bearing nut from loosening. The inner gear was splined to the spindle to keep it from turning. So you can see that there was no way for the bearing nut to come loose. Keeping the inner gear splined to the spindle allowed the axle, (which you called the drive shaft and were careful not to pullout) to turn the outer gear which was floating. The outer gear came in contact with the 4 planetary (spider) gears which spun on the cross. As the planetary gears were being turned by the outer gear and rotating on the cross but being held stationary by the inner gear the only thing they could do was move the cross and it does it at a 2:1 ratio. The cross was held in place by the hub and the tire is attached to the hub. So the cross is what drives the truck down the road. Phew, that's a lot, so now we'll get back to the shim. The shim is used to take up or set the backlash between the inner outer and planetary gears. I know you used the recommended silicone sealant on the hubs, but I found a much better product It's an International Harvester brand silicone sealant T-442. On those Eco gears, all they need to do is machine out the inside diameter of the part the snap ring hits, problem solved. If they say it will make the part weaker there's plenty of room to make the outer diameter bigger and not interfere with the 12 bolts holding it on. Thanks for sharing your truck build.
do a video of the RPMs when cursing at 75mph and do a speed test for us. something like getting onto the highway from an off ramp would be helpful. thanks
@@drivetheglobe do a video on that tachometer. I'm looking at getting one of these truck and trying to figure out what's all involved to get everything done right.
Mike includes my contact info in the kit for reprogramming your ECM. Give me a call at my shop and I can talk to you about that. 3126 or C7 truck? I'm in Oregon if you want to stop in. Only takes about an hour.
I don't think so- at least based on where I am willing to take such a large truck and my house. I have done a little already on some pretty steep loose rock stuff and it was fine in first gear.
can you post how you fixed the speedo to show the correct speed. I would like to see how the hub oil goes back in. this is the 1st time I've heard about needing that C clip at the end of the install. why is that C clip needed?? thanks
I have not corrected the speedo yet. Have not quite figured out how. The C clip I believe holds the axle shaft from moving in and out. There is no C clips on the front.
Definitely makes sense by removing the planetary/spider gears that the vehicle would yield better fuel mileage and increased speed by reducing the friction points . Perhaps the main purpose for the complicated gears is to manage turns on such a heavy truck. However , after 2800 miles seems like so far the benefits outweigh whatever features the spider gears provided.
I think the gears were put in by the military to hit some certain spec that was in the requisition. Not sure what that was but thats what I figure. For most of us I think these are all positive.
@@drivetheglobe The truck specs required that it be able to navigate an 18" vertical wall. Thus the tire size - to ride up over an 18" wall the wall must hit the tires below the center line sufficiently to climb it easily. The gear reduction is for that, and for the boundary conditions of the largest MTV (M1089 wrecker for example) pulling it's full rated capacity up the steepest possible grade. A combined weight of about 90k pounds. For such a load the hub reductions would very likely be required to even get the whole mess moving up a grade.
Hello Michael, thanks for the detailed technical videos! Just wondering, how many miles do you expect to get out of the Goodyear MVTs before needing to replace them due to tread wear?
The rears I find last alot longer. I think the set on my last truck went at least 30k. The fronts, especially if you do highway driving are more like 12-15k
Can't answer that as I have never had that set up. I believe that the eco hubs were designed as an alternative to spending the money on all new highway gears though.
Hi, I saw the episode that deals with changing the hubs, 75 miles per hour maybe in your dreams and if so then maybe for a few seconds downhill. And even then, it's very, very unsafe, and with a vehicle that weighs 15 tons, you should also have some responsibility regarding your data advertises. Do not forget that among your scouts there are many off-road truck drivers. another thing that I wanted to write to you for a long time, you don't drive the globe as you present yourself, you drive and travel especially in the USA, there are those here who have traveled through Asia on the Silk Road, crossed Russia to Siberia, visited all the countries of Northeast Asia, iran, all of Europe, africa and more and more so, I think you need to practice some modesty. besides that you have a nice channel, personally your bike trips are not interesting and you can also see that they have much less views. I hope you can accommodate a negative review as well, good luck.
Thank you for your comments. I am very direct so hope that is OK. Yes- the truck will easily travel at a consistent 75 miles per hour (except uphill) . I very rarely do as I tend to avoid highways. I'm not sure why you would consider that unsafe. Semi rigs routinely drive at that speed and are far heavier. I respectfully would like to correct you on the driving the globe part. I have traveled to over 120 countries on 5 continents including almost every country in Africa, the middle east, Europe and much of Central America. I am not sure why you would say that I have not just because it hasn't been in the past 3 years? The bike trips are followed by far less people, however, the viewership is also far more interested based on a much higher total minutes watched result. So for those who don't like cycling- just skip those videos. Thanks again for watching- but most importantly get out there and travel.
I have an LMTV with the 3.07 conversion and mine will go 75mph. I have the eco hubs ordered and hope to drive 80 as the tires are rated for that. Go find another channel to watch ya tool.
The pedal on a diesel isn’t a throttle, its a speed selector. The pedal position tells the governor or ECU in your case what RPM to run at, and the gov/ECU controls the fuel to achieve and maintain that commanded RPM. You halved the final ratio, so you halved the engine RPM and pedal position necessary to maintain a given speed. At 30K, your gearing should be delivering ~13,400# of thrust from the tires. That should be enough to pull you up 26.5 deg in first gear at peak torque. Your performance would be ~10% better with the original diffs Driving an engine at greater than peak torque RPM is like driving with an exhaust brake on. Thats where a large chunk of that 37% fuel increase is coming from, and why most report that their fan rarely cycles, you no longer have all that excess fuel burn heat to dissipate… great video!
I love hearing from the engineer mind!! Thank you for that summary.
Its the gas pedal. Just like its always been. Whether in my Jeep, my army truck or my Tesla...its still a gas pedal.
I would like to see the engine rpm and speed displayed together while driving in top gear.
I subscribed.
Thank you for the good information.
This is Korea.
Will do! Video coming soon.
NICE! My 1083 will do at least 83 mph. Yeah it was stupid...but somebody had to do it.
And I have not heard the BIG FAN since I installed the hubs.
The truck is SO much more user friendly.
Also, I talked to an Allison tech and he says he can reflash the TCM to start off in 1st gear. Which would be really helpful.
It's on the list...
Nice to know. I hear the big fan once in awhile on big hills, but probably a 10th of the time I used to.
Coming from a 4x4 off road background I can say the benefit of gear reduction hubs is that they reduce the torque applied to the driveline from large dia tires. So doing this will double the torque on the differentials and ujoints and transfer case. This will also cause the engine to actually lug below the PowerBar and likley increase your fuel milage. This would only be a benefit if in most driving situations you find that your engine is reving at the top or above recommended rpm range on road. My worry will be breaking drive axels or ujoints when offloading in low range as they are now being asked to do double the load they were designed to do. But I doubt you would actually drive your litteral house as hard off road as the vehicle is capable. CHEERS AND SAFE TRAVELS Steve h.
Thank you for your comments. I suspect you are right, and also right I probably won't test it to the extremes. Did do some way more aggressive off road this week that I had planned to do and it held up good.
This is great. I have been on the fence about converting my A1, 1078 with hwy gears and been waiting for someone to do it first. Thanks for documenting the process and the final in-depth review.
Appreciate it. Thanks for watching.
Great video Michael. Thank you for sharing your content.
Thank you!
Just binge watched the entire series. Absolutely fantastic! I am curious if you are willing to share how much your total (beginning to end) cost for the entire build is? This seems right up my alley. Something I am interested in doing myself.
Thanks for watching. I would say in the $160-180 range. Will do a video on that eventually.
Great video! Seems like these could also be a great combo with the original diff gear set. 👍🏻
For sure! I think that is really the way they were designed. Certainly a more affordable upgrade option.
Awesome video! I was always wondering the level of effort to install Eco Hubs. Appreciate the near-real-time presentation. Thanks for making this!
Thank you. Yeah, realistically about 45 minutes a wheel. and most of that is cleaning.
Very cool Michael. Great video and information. It looks relatively easy and straight forward as I’m sure it took a few to where it made it that way. All of those machined parts I can see why it was $3,000. I’m assuming that’s for all 6 hubs. Thanks for sharing with us and taking the time to
Thanks as always for watching. Yes, that is for 6 wheels.
Great video with detail. I am not convinced the eco hubs are for me due to my 307 gear change and 14R-20 tires and lower hop 3116 engine. But I would love to have that fuel efficiency gain.
Yeah. That might be a lot. Hope you guys are doing well. See you on the road soon somewhere.
You always intelligent God gave men wisdom isent that great friend 👍🙏
I appreciate that, thank you for watching.
Would like to hear you thoughts after some offroad diving too.
Definitely will follow up with that. I did do
A little on some loose rock steep section and it was fine in first gear.
Hey Mike I just finished binge watching all the videos in this series. I am impressed with your truck and all the work you did. it turned out fantastic. On your in cab video, you showed the AC center console. Did the folks you bought the truck from install the AC or did someone else and is the AC system of the installers design?
You mentioned you're not a mechanic in this video and you weren't sure of the reason for the shims etc. That's okay I think I can explain if you'd like. If you remove the shim, you'll notice a nut behind it. That's the wheel bearing nut and like on most cars they use a cotter pin to keep the nut from backing off. In this particular hub, it used the 2 pins and inner gear that you removed to keep the wheel bearing nut from loosening. The inner gear was splined to the spindle to keep it from turning. So you can see that there was no way for the bearing nut to come loose. Keeping the inner gear splined to the spindle allowed the axle, (which you called the drive shaft and were careful not to pullout) to turn the outer gear which was floating. The outer gear came in contact with the 4 planetary (spider) gears which spun on the cross. As the planetary gears were being turned by the outer gear and rotating on the cross but being held stationary by the inner gear the only thing they could do was move the cross and it does it at a 2:1 ratio. The cross was held in place by the hub and the tire is attached to the hub. So the cross is what drives the truck down the road. Phew, that's a lot, so now we'll get back to the shim. The shim is used to take up or set the backlash between the inner outer and planetary gears. I know you used the recommended silicone sealant on the hubs, but I found a much better product It's an International Harvester brand silicone sealant T-442. On those Eco gears, all they need to do is machine out the inside diameter of the part the snap ring hits, problem solved. If they say it will make the part weaker there's plenty of room to make the outer diameter bigger and not interfere with the 12 bolts holding it on. Thanks for sharing your truck build.
As I always say- love hearing from the engineering minds. That makes alot of sense. Thanks for all of the support.
do a video of the RPMs when cursing at 75mph and do a speed test for us. something like getting onto the highway from an off ramp would be helpful. thanks
Working on that. I just installed an accurate tachometer so I could do that.
@@drivetheglobe do a video on that tachometer. I'm looking at getting one of these truck and trying to figure out what's all involved to get everything done right.
@@King_TuTT I will include that
Excellent video, but I would be concerned about blowing metal bits and grit into the bearings.
Hard to tell from the video but I was pretty careful of that. Thanks for watching.
@@drivetheglobe 👍😎
Mike includes my contact info in the kit for reprogramming your ECM. Give me a call at my shop and I can talk to you about that. 3126 or C7 truck? I'm in Oregon if you want to stop in. Only takes about an hour.
Thank you. It is a 3126 engine. Traveling toward Colorado right now but may give you a shout.
@13:40 'it flies usually to another country' Sounds like a nice drive for you then haha.
Ha Ha. If I did that off camera I would have spent 3 minutes looking for it! 😂
Offroad on a steep incline you might get stranded.... Thoughts?
I don't think so- at least based on where I am willing to take such a large truck and my house. I have done a little already on some pretty steep loose rock stuff and it was fine in first gear.
can you post how you fixed the speedo to show the correct speed. I would like to see how the hub oil goes back in. this is the 1st time I've heard about needing that C clip at the end of the install. why is that C clip needed?? thanks
I have not corrected the speedo yet. Have not quite figured out how. The C clip I believe holds the axle shaft from moving in and out. There is no C clips on the front.
Definitely makes sense by removing the planetary/spider gears that the vehicle would yield better fuel mileage and increased speed by reducing the friction points .
Perhaps the main purpose for the complicated gears is to manage turns on such a heavy truck. However , after 2800 miles seems like so far the benefits outweigh whatever features the spider gears provided.
I think the gears were put in by the military to hit some certain spec that was in the requisition. Not sure what that was but thats what I figure. For most of us I think these are all positive.
@@drivetheglobe The truck specs required that it be able to navigate an 18" vertical wall. Thus the tire size - to ride up over an 18" wall the wall must hit the tires below the center line sufficiently to climb it easily. The gear reduction is for that, and for the boundary conditions of the largest MTV (M1089 wrecker for example) pulling it's full rated capacity up the steepest possible grade. A combined weight of about 90k pounds. For such a load the hub reductions would very likely be required to even get the whole mess moving up a grade.
How did you reset the transmission ? Did you just did the on/off from the truck or you had to connect something to it ?
Just did the on / off thing. Followed the directions in the manual.
Hello Michael, thanks for the detailed technical videos! Just wondering, how many miles do you expect to get out of the Goodyear MVTs before needing to replace them due to tread wear?
The rears I find last alot longer. I think the set on my last truck went at least 30k. The fronts, especially if you do highway driving are more like 12-15k
Thanks
Thanks for watching.
Can you run the eco hubs with a stock differential?
Absolutely. That is what it is made for.
Perhaps Smalley spiral lock rings would be better, no tabs to grind!
Something to look into for sure.
@@drivetheglobe I'll get some for mine when I put the Eco hubs in. That's on the list after the habitat is ready to mount
RAD BRO!
Thank you!🙏
If Eco Hubs are installed, would it still be worth putting in the 3.07 (highway) gears or would you just stick with the stock (3.90???) gears?
Can't answer that as I have never had that set up. I believe that the eco hubs were designed as an alternative to spending the money on all new highway gears though.
Hi, I saw the episode that deals with changing the hubs, 75 miles per hour maybe in your dreams and if so then maybe for a few seconds downhill. And even then, it's very, very unsafe, and with a vehicle that weighs 15 tons, you should also have some responsibility regarding your data advertises. Do not forget that among your scouts there are many off-road truck drivers. another thing that I wanted to write to you for a long time, you don't drive the globe as you present yourself, you drive and travel especially in the USA, there are those here who have traveled through Asia on the Silk Road, crossed Russia to Siberia, visited all the countries of Northeast Asia, iran, all of Europe, africa and more and more so, I think you need to practice some modesty. besides that you have a nice channel, personally your bike trips are not interesting and you can also see that they have much less views. I hope you can accommodate a negative review as well, good luck.
Thank you for your comments. I am very direct so hope that is OK. Yes- the truck will easily travel at a consistent 75 miles per hour (except uphill) . I very rarely do as I tend to avoid highways. I'm not sure why you would consider that unsafe. Semi rigs routinely drive at that speed and are far heavier. I respectfully would like to correct you on the driving the globe part. I have traveled to over 120 countries on 5 continents including almost every country in Africa, the middle east, Europe and much of Central America. I am not sure why you would say that I have not just because it hasn't been in the past 3 years? The bike trips are followed by far less people, however, the viewership is also far more interested based on a much higher total minutes watched result. So for those who don't like cycling- just skip those videos. Thanks again for watching- but most importantly get out there and travel.
I have an LMTV with the 3.07 conversion and mine will go 75mph. I have the eco hubs ordered and hope to drive 80 as the tires are rated for that. Go find another channel to watch ya tool.
ya tool ? 😅