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Old 03-31-2013, 07:40 PM   #1
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What gearing for 35's on 4.0L Automatic?

What would be the best gearing to bring my1998 TJ 4.0L Automatic with 35's back to stock?

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Old 03-31-2013, 08:14 PM   #2
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4.56 or 4.88 for 35's

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Old 03-31-2013, 08:56 PM   #3
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32rh = 4.56. I have a 98 4.0 auto with 35's. You won't regret it.
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Old 03-31-2013, 09:06 PM   #4
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Definitely go 4.56. My TJ had 4.88 with 35" tires when I converted from its OE 5-speed manual to the 32RH automatic & my RPMs were a little too high on the highway. 4.56 will be just right.
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Old 03-31-2013, 09:11 PM   #5
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Thanks for the info guys
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Old 03-31-2013, 09:17 PM   #6
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I like to work on all my toys myself so I plan on doing the gear change along with a mechanic friend of mine. Exactly what would i need for the 4.56 swap?
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Old 03-31-2013, 09:24 PM   #7
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What rear axle do you have & what is your present ratio?
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Old 03-31-2013, 09:33 PM   #8
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Man honestly I don't know what setup I have. Its all stock. How do I tell?
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Old 03-31-2013, 09:35 PM   #9
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Take a picture of the rear axle and post. Or if the filler plug is rubber it's a dana 35 if its a metal screw in plug it's a dana 44 most likely.
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Old 03-31-2013, 09:42 PM   #10
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Originally Posted by Claborde View Post
Man honestly I don't know what setup I have. Its all stock. How do I tell?
The first image shows a tag on the side of the differential cover which will have the ratio embossed into it. You'll see in the below photo that '3 73' has been circled in red indicating a 3.73 axle ratio.

The next pic shows a Dana 35 with a rubber snap-in plug in the lubricant fill hole, the last pic shows a Dana 44 which has a steel bolt plugging its lube fill hole
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Old 03-31-2013, 09:59 PM   #11
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Thanks man I'll check in morning and let y'all know.
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Old 03-31-2013, 09:59 PM   #12
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4.56's fo sho.
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Old 03-31-2013, 11:05 PM   #13
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Does the gearing preference change with a manual? I have 5 speed with a Dana 44 rear.
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Old 03-31-2013, 11:12 PM   #14
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Does the gearing preference change with a manual? I have 5 speed with a Dana 44 rear.
Yes, the proper axle gear ratio is affected by tire size, engine size, and transmission type. What size tires are you running?
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Old 03-31-2013, 11:20 PM   #15
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I am running 33x12.5.
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Old 03-31-2013, 11:22 PM   #16
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But I also want to go to 35"
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Old 04-01-2013, 12:27 AM   #17
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4.56 for 33", 4.88 for 35".
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Old 04-01-2013, 11:59 AM   #18
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Would 35s be OK on a Dana 30 front and Dana 44 rear? 4.88 gears.
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Old 04-01-2013, 12:17 PM   #19
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Would 35s be OK on a Dana 30 front and Dana 44 rear? 4.88 gears.
Yes
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Old 04-02-2013, 01:36 AM   #20
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Jerry you seem like the go to guy I keep seein on here. Do you know of any re-gearing write-ups for weekend DIY'selfers like myself? Or is this somthin I should just hand off to a mechanic since my jeeps downtime is limited as it is my only vehicle? I know my way around an engine but axles, transfers and trannys are like gibberish unless im talking ratios or noises.

edit: Also do I need to worry about the carrier if im going from 3:73's-4:56's???
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Old 04-02-2013, 09:45 AM   #21
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Originally Posted by Rob and TJ View Post
Jerry you seem like the go to guy I keep seein on here. Do you know of any re-gearing write-ups for weekend DIY'selfers like myself? Or is this somthin I should just hand off to a mechanic since my jeeps downtime is limited as it is my only vehicle? I know my way around an engine but axles, transfers and trannys are like gibberish unless im talking ratios or noises.

edit: Also do I need to worry about the carrier if im going from 3:73's-4:56's???
Randy's Ring & Pinion at Randy's Ring & Pinion has plenty of technical articles like the one for installing a new ring & pinion at http://www.ringpinion.com/Content/Ho...structions.pdf.

But personally, for a daily driver, I would have a good ring & pinion guy/shop install it. It takes quite a bit of time & expertise to properly set up gears. I have a garage full of tools, air tools, welder, etc but I won't tackle an R&P installation. If you don't get it done right the first time, the new gears will be toast in short order.

Carrier breaks, when you need to change the carrier for going to lower ratio gears, are described at Common Carrier Breaks

Good luck with it.
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Old 04-02-2013, 10:38 AM   #22
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This is some good info here.

Jerry I went to the link for the Carrie Breaks and they don't have the D35 on there. I'm sitting on 3.73 and the D30 goes up from there but the D44 is up to 3.73. No way of guessing the 35 :/
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Old 04-02-2013, 11:33 AM   #23
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This is some good info here.

Jerry I went to the link for the Carrie Breaks and they don't have the D35 on there. I'm sitting on 3.73 and the D30 goes up from there but the D44 is up to 3.73. No way of guessing the 35 :/
I forgot to mention that for some reason, they have the Dana 35 as an M35 under the AMC heading.
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Old 04-02-2013, 11:43 AM   #24
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Well that explains a lot. Glad to see that with my current setup I would't need new carriers if/when I go to 4.56 (or 4.88 if I choose to go to 35s)
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Old 04-02-2013, 07:50 PM   #25
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4.56 sounds good for 33x12.5 and 33x10.5...
any suggestions on where to buy R&P quadratec n 4wheelparts seem a lil high but i dont know anything bout any other sites buying online is easy but always worried of being ripped off.

and btw jeep has only ever had me driving it but if i were to let someone else drive it it would be jerry lol
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Old 04-02-2013, 07:52 PM   #26
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Superior Axle & Gear is a good place for gears etc. followed by www.ringpinion.com.
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Old 04-02-2013, 08:23 PM   #27
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ok heres one for you ive got the 10 bolt d35 rear with 3.07 we got the gears at 4.56 for both front and rear but heres where my dilema sets it gears up front no prob but on rear i want a locker installed since i'll be in there anyways do i
A-install gears and no locker in rear
B-install gears and locker in rear same axle
C-swap out whole axle with gears and locker pre installed

ive done a little reasearch into this only for taking the old "if it aint broke dont fix it" approach but the devil in me says hell why not. Ive seen rear complete axles close to 3k but only from quadratec couldnt find any on superior axle & gear.

what do you guys think
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Old 04-02-2013, 08:30 PM   #28
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If you have the $$$, I'd get a whole new axle from someone like Currie Enterprises - Custom Rearends, Jeep/Off-road Parts, Crate Rearends, 4x4 Rearends. Otherwise I'd go for Option A, I wouldn't even consider Option B.

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