Axle Regear??? - JKowners.com : Jeep Wrangler JK Forum
 
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post #1 of 14 Old 07-10-2015, 04:51 PM Thread Starter
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Axle Regear???

I have a 2015 JK with a D30 in the front and D44 in the back with 3.21 gears. Soon I'm gonna be putting about a 4" lift and 37s on it. I'm just wondering if I can put a 4.88 gear in the front D30 or if I'm gonna need an axle swap? Also is the 4.88 gear good for mostly daily driver occasional off-roading?
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post #2 of 14 Old 07-10-2015, 05:18 PM
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You can put 4.88's in a D30 you just need to get a new carrier.

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post #3 of 14 Old 07-10-2015, 05:37 PM
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If you're just going to use it on the street, that will probably work. If you're going to take it off-road, you'll need axle sleeves, gussets, and probably chromoly axle shafts to beef up the D30. That's a lot of tire for a weak axle.
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post #4 of 14 Old 07-10-2015, 06:16 PM
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if you are going to sleeve it don't put a truss on it instead.

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post #5 of 14 Old 07-10-2015, 06:56 PM
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if you are going to sleeve it don't put a truss on it instead.
Instead of sleeves use a truss? Not disagreeing, just obsorbing info for my own D30.
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post #6 of 14 Old 07-10-2015, 07:11 PM
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Quote:
Originally Posted by JeepmanJim View Post
Instead of sleeves use a truss? Not disagreeing, just obsorbing info for my own D30.

My opinion..
Truss offers more strength than sleeves, if you weld it correctly.

If I had a D30, I would add C gussets and, if necessary, re gear it and run it as is...and save for a better axle if I was going bigger than 35's. I wouldn't truss or do axle sleeves. The JK D30 weak point, again my opinion, is the ring and pinion.

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post #7 of 14 Old 07-10-2015, 07:17 PM
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Same as above I would deff truss it over sleeving and add the Johnny joint kit for the upper CA mounts on the axle side
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post #8 of 14 Old 07-11-2015, 08:32 AM
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I would choose 4.56 gears unless you don't drive over 70 on the hwy. If you wheel light you won't need to beef up the front axle just wheel it until it bends then place it with a d44 HD housing. I have several jeeps that get moderately wheeled with no housing upgrades on 37's.


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post #9 of 14 Old 07-11-2015, 09:54 AM
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Not to hijack thread, but why does an auto manufacturer choose a 3.21 gear for a friggin offroad platform like a jeep ? Makes no sense to me other than them knowing we'll spend the coin to regear like the op is about to do, and possibly void the warranty. That way they get out of covering any legit claim.
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post #10 of 14 Old 07-11-2015, 09:27 PM
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Quote:
Originally Posted by Mullet View Post
Not to hijack thread, but why does an auto manufacturer choose a 3.21 gear for a friggin offroad platform like a jeep ? Makes no sense to me other than them knowing we'll spend the coin to regear like the op is about to do, and possibly void the warranty. That way they get out of covering any legit claim.



Highway MPG would be my guess

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post #11 of 14 Old 07-12-2015, 06:51 AM
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4.88 gears will make the jeep feel like a stock rubicon on 37s.

if you want it to feel like you are currently before the 37s, 4.56 is more accurate.

i would recommend 4.88 and weld on the arctec axle armor kit or something while the axle is down. i know plenty people with slightly beefed dana 30s on 35s and 37s doing just fine.

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post #12 of 14 Old 07-12-2015, 01:26 PM
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Quote:
Originally Posted by Mullet View Post
Not to hijack thread, but why does an auto manufacturer choose a 3.21 gear for a friggin offroad platform like a jeep ? Makes no sense to me other than them knowing we'll spend the coin to regear like the op is about to do, and possibly void the warranty. That way they get out of covering any legit claim.
I think Jeep looks at the Rubicon as the off road platform. The other models are probably looked at as cars/mall crawlers. Plus as said already, the 3.21's help with mpg #'s and also total fleet mpg #'s.

To the OP, the only difference between the D30 and D44 is the R&P size, everything else is the same. So you can weld whatever you want on the outside of the housing, the weak link is still inside. That said, I'm still riding on an untouched D30 with 37's and the tires before that were 39.5 IROKs. I just try to be smart when beating on it. I would never put a locker in the front, that's when you get to really test the D30. YMMV

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post #13 of 14 Old 07-12-2015, 06:00 PM
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Axle Regear???

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Originally Posted by gt1guy View Post



To the OP, the only difference between the D30 and D44 is the R&P size, everything else is the same.

D30 has 27 spline axle shafts.
Rubi D44 has 30 spline.

U Joints are different too

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Last edited by TCdawg; 07-12-2015 at 06:13 PM.
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post #14 of 14 Old 07-13-2015, 05:03 AM
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When you regear you will need a new carrier (3.73 and up). It would not be very much more to put in a Truetrac LSD at the same time. Beats putting in and paying for a open diff carrier in. The Truetrac part number you want is 912A585.
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