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Unread 11-06-2011, 08:32 PM   #16
Wheelin98TJ
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Quote:
Originally Posted by Jerry Bransford View Post
That high with 4.56? That sounds like what I think I used to see at 70 mph with my 4.88 gearing, 35" tires, and 32RH transmission. At least to the best of my foggy geezerdly memory.
You should have been closer to 3,500 RPM at 70 MPH.

Maybe you were just driving slower.

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Unread 11-11-2011, 04:46 PM   #17
rwilson93
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Does anyone have any experience on getting this done? I have the stock differentials - Dana 35 rear and Dana 30 front. I have been told I need a new case if I go over 3.73. Is this correct? Is there anything else that needs to be replaced? I honestly have no idea how to do this, but I love doing the work for myself if I can. Any advice? At the very least if I can't do the work myself I want to get all the parts myself so I know exactly what is going in.
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Unread 11-11-2011, 05:36 PM   #18
Elipsisfade
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I'm in the same boat '05 wrangler 4 cylinder 6 speed with 6 inch lift and 33'' tires...3.73 ring and pinion...its either 4th gear at 3500rpm or dump it into 5th at 1200rpm...smh...will 4.10s improve my set up?? I use my jeep for primary daily driving.
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Unread 11-11-2011, 09:50 PM   #19
Photog2000
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Here is my take on the situation. Go to 3.73 max. I was running 3.07 gears up until a couple months ago with the 3 speed auto and 35 inch tires. I was happy as heck with my gas mileage. I was averaging about 16 MPG, and on a trip out on the highway I was pushing 19MPG. Everyone told me I needed to regear to get good gas mileage so the engine could run in a range where it was happy. The numbers of 4.56, and 4.88 were tossed around like it was law. I ended up going to 4.10 to get back to stock-like performance using gear calculators. Now I get 13.4 MPG on average and even worse on long trip on the highway. It performs much better off-road but my wife *****es at me constantly about how often I stop at the gas station to the point where I am now looking for a **** box work beater for gas milage.
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Unread 11-11-2011, 11:08 PM   #20
rwilson93
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Did you do the swap yourself or have it done? How much does a re-gear generally run? I have been asking around and not getting a clear answer. Some say it's not too hard to do and some say you have to have a pro do it.
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Unread 11-11-2011, 11:19 PM   #21
Greenfun2
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To do your own gears you have to know how to shin the pinion, or something to that effect. I've heard it's hard, I've heard it's not too bad. Maybe there's some YouTube videos floating around about it.
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Unread 11-11-2011, 11:47 PM   #22
Photog2000
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I did it myself. I went the easy route and just bought a 4cyl parts jeep and just swaped the entire axles.

BTW I just went for a drive in to town. My speeds were 70MPH was 2900RPM, 60MPH was 2500RPM, and 55MPH was about 2100RPM
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Unread 11-12-2011, 11:04 AM   #23
RowJ
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Quote:
Originally Posted by rwilson93 View Post
I have been told I need a new case if I go over 3.73. Is this correct? .....
Yes, if you go lower gears (higher #) than 3.73, you will need a new Carrier (about $60.00).

Quote:
Originally Posted by rwilson93
.... I honestly have no idea how to do this, but I love doing the work for myself if I can. Any advice? .......
Read HERE
Great "How to" write up by first timer!
You can decide for yourself if you can handle it. Professionals will charge you for 4-5 hrs labor x their hrly rate.
IMO, doing it is not that hard for average weekend mechanic. Doing it right can be tricky... it's precision work.

RJ
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Unread 11-13-2011, 07:25 AM   #24
hokahay
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I have a 2003 Jeep TJ with a 42LE auto and an I6 with a D44. It came with 3.73s and like 28" tires. I am now on 33 MTRs with 4.56s and a detroit in the rear. It's at factory power since 28 / 3.73 is close to 33 /4.56. I am getting 16 mpg but then i am heavy with armor and hard top too down from 18 when i got it un modified 7 years ago. 2100 rpm in overdrive at 60. 2450 at 70. 3000 at 60 in 3rd and, of course 3500 at 70 in third.
I think it is just right.
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Unread 11-13-2011, 07:27 AM   #25
dkrajcovic
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4.56
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Unread 11-13-2011, 01:40 PM   #26
Muddybrit
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Quote:
Originally Posted by RowJ View Post
Assume, based on how you word the question, you have a LSD now? I would leave it be. LSD is good for mild off road and if your doing serious off road (rock crawling) you don't want to keep the D35 axle. It won't hold up!
Either way, for off roading, I would (I did) add chrome moly axles! Many here will tell you "don't put any money in a D35 rear axle" but it depends on how/where you drive.
RJ
This is a refreshing response regarding the D35 and I agree.
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