35’s, auto and 5.13 gears.

[Vinman]

I do most of my driving at 3,500-6,500’ elevation and am getting 5.13’s installed soon. Also plan to tow a trailer that should come in around 1,800 lbs and about that same height as the Jeep.
Anybody run this combo and if so, how do you like it?

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[jessedacri]

I've got 4.88s, auto, and 35s and it's just about perfect with the 3.6. 4L on trail has a super, super slow first gear that is absolute bliss to navigate obstacles with, and it feels agile on the road. If you're constantly at elevation and will be towing then the step up to 5.13s may not be a bad idea. but you're certainly at the absolute maximum I'd put in a D44 with 35s.

 

[IceBerg]

Im not brave enough to run 5.13s on a dana44.


Of all the D44s that Ive seen grenade I would say 80% of them were 5.13s or 5.38s. There just isnt much meat on them

 

[Vinman]

Im not brave enough to run 5.13s on a dana44.


Of all the D44s that Ive seen grenade I would say 80% of them were 5.13s. There just isnt much meat on them

What exactly is breaking on them? Is the pinion failing? My understanding is the pinion is smaller than 4.88’s or higher but is it causing a problem?

 

[RedundanT]

Jesus

 

[Vinman]

Jesus

Well that was helpful

 

[micahpop]

Anybody run this combo and if so, how do you like it?

Jesus

I think Jesus runs 4.88s but I could be wrong...

 

[mnjeeper]

I think Jesus runs 4.88s but I could be wrong...

I think he means Jesus is breaking pinions. I don't know why.

 

[RZ.]

Jesus

 

[Steph1]

I decided to trust Jeep and go 4.56 with my 35s and couldn’t be happier. I think that anything bigger than 4.88 is getting pretty small and weak.

 

[Zandcwhite]

Don't do it. I jumped from factory 4.10's to the deep end with 5.38's. Even on 38's, 4.10's were better for both freeway and daily mixed use driving. Went from 17mpg average daily driving and 16 on road trips with the cruise control set at 83mph to 15 average daily driving and 13 on the freeway with the cruise control set at 75mph. Too low is worse than too high in my experience. We drove, roadtripped, and wheeled with 4.10's and 37-38" mt's for 2 plus years and 35k miles before the regear. Only place the gearing felt lacking was in reverse in high range. Engine would bog in deep sand or snow. Nothing shifting in to 4LO wouldn't solve. Because of that 1 minor issue I spent a bunch of money and went deep. After 3 months and~3k miles, I absolutely would not do it again. For 38's I think 4.88's would be great. For 35's 4.56 is as low as I would go. I absolutely wouldn't spend $2k+ to go from 4.10's to 4.56, so if I were sticking with 35's I wouldn't even bother regearing.

 

[DesertsJL]

My 2018 JLU ran the 3.6l auto with 5.38 gears and both 35 & 37” tires (2” lift). I really liked the setup. So much so that when we bought my wife’s 2022 JLR auto we had it regeared as well. While not as high, we went with 5.13 gears and 35” tires (no lift). It’s the perfect setup for us.

Keep in mind that the auto has a .64 overdrive. Even with really deep gears you aren’t overrevving the motor. Running the deeper gears reduces stress on the motor and provides better torque multiplication and believe it or not, often reduces fuel costs.

 

[Cycle11111]

Don't do it. I jumped from factory 4.10's to the deep end with 5.38's. Even on 38's, 4.10's were better for both freeway and daily mixed use driving. Went from 17mpg average daily driving and 16 on road trips with the cruise control set at 83mph to 15 average daily driving and 13 on the freeway with the cruise control set at 75mph. Too low is worse than too high in my experience. We drove, roadtripped, and wheeled with 4.10's and 37-38" mt's for 2 plus years and 35k miles before the regear. Only place the gearing felt lacking was in reverse in high range. Engine would bog in deep sand or snow. Nothing shifting in to 4LO wouldn't solve. Because of that 1 minor issue I spent a bunch of money and went deep. After 3 months and~3k miles, I absolutely would not do it again. For 38's I think 4.88's would be great. For 35's 4.56 is as low as I would go. I absolutely wouldn't spend $2k+ to go from 4.10's to 4.56, so if I were sticking with 35's I wouldn't even bother regearing.

I have as heavily mod‘d sport and went 4.88 and absolutely love it. I run 35s and my mpg went up 2 mpg vs stock on the 3.45s and wheeling is night and day better. Now to be fair I trussed my rear end and put and ultimate 44 from Danatrac in my front.

 

[Jim1964]

Jeep believes 4.56 is ideal, and based on my experiences I agree.
The deeper you go, the weaker the pinion.

 

[Zandcwhite]

My 2018 JLU ran the 3.6l auto with 5.38 gears and both 35 & 37” tires (2” lift). I really liked the setup. So much so that when we bought my wife’s 2022 JLR auto we had it regeared as well. While not as high, we went with 5.13 gears and 35” tires (no lift). It’s the perfect setup for us.

Keep in mind that the auto has a .64 overdrive. Even with really deep gears you aren’t overrevving the motor. Running the deeper gears reduces stress on the motor and provides better torque multiplication and believe it or not, often reduces fuel costs.

If you keep speeds down gearing can reduce fuel costs. If you frequent areas with 75-80mph speed limits and spend hours at 80+, you absolutely will lose fuel economy spinning ~3k rpms even down hill vs spinning 2300 if you weren't geared so deep. On a Rubicon, deep gearing is even less important as you have the massive torque multiplication of the 4-1 low range. Having driven both 4.10's and 5.38's in our jlur for thousands of miles across all types of terrain, I'd say aim in the middle in my opinion for performance and economy.

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