UD 60 regear - JKowners.com : Jeep Wrangler JK Forum
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post #1 of 20 Old 05-21-2019, 01:56 PM Thread Starter
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UD 60 regear

My axles are currently 4.88 and i need lower gears. Like much lower gears. I dont know if 5.38's will be enough. Does anyone know if i can get a 5.86 in the front. I know the rear is just a standard 60 gear and almost any ratio is available.
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post #2 of 20 Old 05-21-2019, 02:57 PM
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What size tire are you trying to run where 5.38 wont cut it?


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post #3 of 20 Old 05-21-2019, 04:01 PM
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5.38 is as low as it goes for hp 60 gear sets unfortunately. I am in your boat and wished I could run a lower gear as well. If you feel like dropping a lot of coin to get there, the rock 70 ring and pinion will be available in a 5.86 soon.
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post #4 of 20 Old 05-21-2019, 06:34 PM
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You could throw some portals on there.

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post #5 of 20 Old 05-21-2019, 06:45 PM
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Do you just need a lower low range?

Underdrive box before tcase, or spendy 4-speed tcase would get you there.


What are you trying to accomplish?
Wheeler?
ArKenTuckBamaSsippi mud machine?
Biggest tires at the mall?

EDIT: Rockwells are 6.72:1

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post #6 of 20 Old 05-21-2019, 06:57 PM Thread Starter
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Im running 40's so im sure 5.38 would "cut it" i mean 4.88's arnt horrible, but id like to have some 42's on this thing eventually. I thing the biggest factor is where i live. Nothing is flat and im at 6k feet elevation so engine performance is not as good. I also DD a pretty fast cummins so when im in the jeep it feels like im dragging a boat anchor around.

Im just looking to see what my options are. Not sure its worth the cost of gears to get that extra 0.5:1 in the axles. Maybe if i can find them when the right sale comes along.
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post #7 of 20 Old 05-21-2019, 07:06 PM Thread Starter
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Quote:
Originally Posted by ExWrench View Post
Do you just need a lower low range?

Underdrive box before tcase, or spendy 4-speed tcase would get you there.


What are you trying to accomplish?
Wheeler?
ArKenTuckBamaSsippi mud machine?
Biggest tires at the mall?

EDIT: Rockwells are 6.72:1

I dont need more crawl ratio. Its ok there.

Not interested in rockwells or portals, i drive it way to much to go that route

Last edited by 1Tontractor; 05-21-2019 at 07:12 PM.
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post #8 of 20 Old 05-21-2019, 07:50 PM
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Quote:
Originally Posted by 1Tontractor View Post
I dont need more crawl ratio. Its ok there.

Not interested in rockwells or portals, i drive it way to much to go that route
OK, gotcha - trying to make up for ~shit engine power - that I understand

(not building cousindatemobile on rice & cane tires, thank Jeebus )

As you likely know: gears can make it quicker . . . but fast needs horsepower.

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post #9 of 20 Old 05-22-2019, 05:20 AM
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I too live at 6000' up Mt. Rose with 40's and 5.38 gears on an 07 six speed. It works but really need more motor climbing the grade. I also have thought about moving to 42's but in reality should be looking at 39's There is really no need for 42" tires just the want. 42x14.5" tires would be a stretch for a UD60 anyway.
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post #10 of 20 Old 05-22-2019, 07:12 AM
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Quote:
Originally Posted by thedirtman View Post
42x14.5" tires would be a stretch for a UD60 anyway.
Love to hear why you think that? Because that is exactly what I am preparing to run.


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post #11 of 20 Old 05-22-2019, 07:13 AM
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Have you thought about adding some forced induction?

What engine/trans combo are you running?


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post #12 of 20 Old 05-22-2019, 08:06 AM
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Quote:
Originally Posted by ALASHA View Post
Have you thought about adding some forced induction?

What engine/trans combo are you running?
x2 on power adder.

I don't even want to imagine what it would be like trying to drive mine without the Ripp.

I have 5.38s 3.8L auto with Ripp and 41.5's and it doesn't even like the "grades" in South Florida the very rare occasions that I drive it over 55mph on the streets.

Chase Weston
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post #13 of 20 Old 05-22-2019, 05:33 PM
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Quote:
Originally Posted by ALASHA View Post
Love to hear why you think that? Because that is exactly what I am preparing to run.
The UD 60 is too narrow for that big a tire. Its perfect for a 37x12.5 thought 9" wheel with 4.5" BS. For a 42"x14.5" I would want and axle with a WMS of 72-74"

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post #14 of 20 Old 05-23-2019, 04:12 AM
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Quote:
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x2 on power adder.

I don't even want to imagine what it would be like trying to drive mine without the Ripp.

I have 5.38s 3.8L auto with Ripp and 41.5's and it doesn't even like the "grades" in South Florida the very rare occasions that I drive it over 55mph on the streets.

You must have very heavy tire/wheel combo + the housings must be as heavy as I imagine, not to mention rest of the Jeep. With 5.38s & a supercharger I'd have a lot more power ...what's your Jeep weigh? You must have very heavy wheels/tires ,too. I'd have thought that setup would get going at least a little bit faster on the flat Florida terra..




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post #15 of 20 Old 05-23-2019, 07:19 AM
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Quote:
Originally Posted by j3ff3ry_j33p View Post

You must have very heavy tire/wheel combo + the housings must be as heavy as I imagine, not to mention rest of the Jeep. With 5.38s & a supercharger I'd have a lot more power ...what's your Jeep weigh? You must have very heavy wheels/tires ,too. I'd have thought that setup would get going at least a little bit faster on the flat Florida terra..


Hell yeah I do. The pitbulls are like 114lbs a piece IIRC. ATX wheels saved a little weight being aluminum but I have no clue what they weigh. Both axles are fully trussed. 14 bolt without truss is around 550lbs, D60 without truss is around 500lbs.

Just guessing on very rough estimates, probably 800-900lbs rear un-sprung weight and 700-800lbs front un-sprung.

I need to actually weigh the jeep and see what I'm at. My buddy had some nice scales to measure the distribution but gave them back to the dude he borrowed them from. Maybe I'll hit him up to see if he can get them again.

It just downshifts and starts screaming at any little bit of extended grade over like 65mph.

Chase Weston
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post #16 of 20 Old 05-23-2019, 11:21 AM
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Quote:
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Hell yeah I do. The pitbulls are like 114lbs a piece IIRC. ATX wheels saved a little weight being aluminum but I have no clue what they weigh. Both axles are fully trussed. 14 bolt without truss is around 550lbs, D60 without truss is around 500lbs.

Just guessing on very rough estimates, probably 800-900lbs rear un-sprung weight and 700-800lbs front un-sprung.

I need to actually weigh the jeep and see what I'm at. My buddy had some nice scales to measure the distribution but gave them back to the dude he borrowed them from. Maybe I'll hit him up to see if he can get them again.

It just downshifts and starts screaming at any little bit of extended grade over like 65mph.

got it.
Likewise, as a 3.8+42RLE owner, I am most familiar with that screamin' .
(relegation of the Jeep to trail use gets rid of the screaming. )
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post #17 of 20 Old 05-23-2019, 02:20 PM Thread Starter
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Quote:
Originally Posted by KnightJK View Post
x2 on power adder.

I don't even want to imagine what it would be like trying to drive mine without the Ripp.

I have 5.38s 3.8L auto with Ripp and 41.5's and it doesn't even like the "grades" in South Florida the very rare occasions that I drive it over 55mph on the streets.

Iv considered it but 6k for a supercharger just seems crazy. Ill just have to suck it up and deal.
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post #18 of 20 Old 05-24-2019, 10:46 AM
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Without going to 9" housings you're going to be stuck at 5.38

Though in a 9" Front & Rear, you could run all the way down to 6.50 Nitro Gears


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post #19 of 20 Old 05-30-2019, 06:04 PM
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Ls3 & 6L80 will solve your problems.
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post #20 of 20 Old 05-31-2019, 05:21 AM
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Good luck with that in Cali.

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