ECODIESEL DIFF RE-GEARING

[grimmjeeper]

That has nothing to do with running badge trails in 2h, right?

With a Rubicon Transfer case and 4.88s, I can believe it. I often find myself in 3rd or 4th when on moderate sections of trails in low range and my diesel has 3.73s with 37s.

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[Ratbert]

With a Rubicon Transfer case and 4.88s, I can believe it. I often find myself in 3rd or 4th when on moderate sections of trails in low range and my diesel has 3.73s with 37s.

I'm thinking a BOH trail that's doable in a rear-wheel drive vehicle would be pretty damn wimpy. Yes, BOH trails like that exist, but I'm not sure I'd be implying that gearing had a significant impact on that "achievement".

Note that 4.88s are only ~5.4% lower geared than what I ran for a couple years (4.63s), so it's not like I'm speaking out my ass.

 

[JINO]

Im so torn on 4.10 and 4.56 gearing.
I have 38x13.5x17 at the moment, and while it seems fine and hits 8th normally, im wondering if 4.10 would be enough.
Its possible I may jump down to 37x13.5x17 or 37x12.5x17 due to lack of options for 38s.

Used set of 4.10s are much cheaper than new 4.56

 

[grimmjeeper]

Im so torn on 4.10 and 4.56 gearing.
I have 38x13.5x17 at the moment, and while it seems fine and hits 8th normally, im wondering if 4.10 would be enough.
Its possible I may jump down to 37x13.5x17 or 37x12.5x17 due to lack of options for 38s.

Used set of 4.10s are much cheaper than new 4.56

Almost no reputable shop will install used gears. The few that do won't guarantee the work at all. There's just no way to guarantee the condition of the gears.

I install my own gears and won't install used gears in any of my axles.

4.10s are close enough to 3.73 that you won't really notice the change. If you're regearing a diesel, go to 4.56. I haven't heard anyone complain about 4.56s with 37s. Especially if they're towing.

 

[zouch]

used gears couldn't be cheap enough for me to bother installing them, even if they were free.
no way that would be a considering factor in my choice for gearing.

Im so torn on 4.10 and 4.56 gearing.
I have 38x13.5x17 at the moment, and while it seems fine and hits 8th normally, im wondering if 4.10 would be enough.
Its possible I may jump down to 37x13.5x17 or 37x12.5x17 due to lack of options for 38s.

Used set of 4.10s are much cheaper than new 4.56

 

[JINO]

Almost no reputable shop will install used gears. The few that do won't guarantee the work at all. There's just no way to guarantee the condition of the gears.

I install my own gears and won't install used gears in any of my axles.

4.10s are close enough to 3.73 that you won't really notice the change. If you're regearing a diesel, go to 4.56. I haven't heard anyone complain about 4.56s with 37s. Especially if they're towing.

I rarely tow.
There's a lot of shops here with leftover 4.10 from other jeeps to jump to 4.56 or 5.13 on their gas wranglers. Some nearly new.
Though, my buddy says he can get me revolution gears at a decent price.

 

[drick]

4.10s are close enough to 3.73 that you won't really notice the change. If you're regearing a diesel, go to 4.56. I haven't heard anyone complain about 4.56s with 37s. Especially if they're towing.

just to clarify, would this same advice apply to him being on 38's? i am in similar situation with the same sized tires and am considering this as part of my upcoming adventures to chase the overheating problem.

 

[grimmjeeper]

just to clarify, would this same advice apply to him being on 38's? i am in similar situation with the same sized tires and am considering this as part of my upcoming adventures to chase the overheating problem.

The 3.73 to 4.10 swap applies universally.

38s would see just a little more benefit from 4.56 than 37s.

One benefit is that you get into the upper gears in the transmission with 4 56s a lot easier. That's where the torque converter locks up and you get less heat buildup.

With 3.73s you should be in 8th at 75-80 for sure though. At least on flat ground. And the torque converter should be locked. Though climbing a grade or driving into a headwind may force a downshift.

 

[drick]

The 3.73 to 4.10 swap applies universally.

38s would see just a little more benefit from 4.56 than 37s.

One benefit is that you get into the upper gears in the transmission with 4 56s a lot easier. That's where the torque converter locks up and you get less heat buildup.

With 3.73s you should be in 8th at 75-80 for sure though. At least on flat ground. And the torque converter should be locked. Though climbing a grade or driving into a headwind may force a downshift.

there was a thread i saved here or on the other forum when the diesels first dropped that had this same suggestion.

now that we all have been running them a while, wasn't sure this was still the recommendation. thanks for confirming!

for me, i would say I'm in 8th between 2/3 - 3/4 of the time at speed. it is pretty finicky with very mild variations (wind, slight incline, semi trailer pass, etc.) and i then have to goose it a bit to speed up then it will drop back into 8th.

we do a lot of long distance driving - so a big portion of this is related to cruise control as well.

 

[grimmjeeper]

there was a thread i saved here or on the other forum when the diesels first dropped that had this same suggestion.

now that we all have been running them a while, wasn't sure this was still the recommendation. thanks for confirming!

for me, i would say I'm in 8th between 2/3 - 3/4 of the time at speed. it is pretty finicky with very mild variations (wind, slight incline, semi trailer pass, etc.) and i then have to goose it a bit to speed up then it will drop back into 8th.

we do a lot of long distance driving - so a big portion of this is related to cruise control as well.

Yeah. I loved 3.73s and 35s. On 37s, I really want just a little more gear. 4.10 would be ideal. But in reality, 3.73 is in the "acceptable" zone.

Even though I do gear installs myself, I don't feel it's worth the time and money to go from 3.73 to 4.10.

I thought about finding a set of Rubicon take offs, but I've done a lot to upgrade my axles. I don't want to have to repeat all that work either.

 

[Trdecker]

456 with 37's is awesome on hwy and trails

 

[Tpsillos]

I threw some gas Rubi axles in mine for a couple years, it did fine even from 38s to 40s. I junkyard one ton swapped it and went 4.88 which was a mistake on 40s 4.56 probably would have been perfect.

 

[grimmjeeper]

I threw some gas Rubi axles in mine for a couple years, it did fine even from 38s to 40s. I junkyard one ton swapped it and went 4.88 which was a mistake on 40s 4.56 probably would have been perfect.

Definitely easy to over gear the diesel.

 

[Ratbert]

I threw some gas Rubi axles in mine for a couple years, it did fine even from 38s to 40s. I junkyard one ton swapped it and went 4.88 which was a mistake on 40s 4.56 probably would have been perfect.

4.56s works really well with 37s in my EcoDiesel.

 

[zouch]

4.56s with 37s pencils out to be about even with the stock tires on 3.73s.

i'm using 4.56s with BFGs 37s right now, and while it works OK, i'd be happy with a slightly larger tire (like at least a Mickey, or maybe something in a 38).

I threw some gas Rubi axles in mine for a couple years, it did fine even from 38s to 40s. I junkyard one ton swapped it and went 4.88 which was a mistake on 40s 4.56 probably would have been perfect.

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