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Unread 11-05-2011, 12:46 AM   #1
rwilson93
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What gears do you recommend?

I am running 33's on my 01 TJ 4.0 automatic. Right now it has the stock 3.07 gears and it's a real dog on hills etc. Anyone have a recommendation for gearing? I do a lot of highway driving so I don't want to go too high. I was thinking 4.10's would be best but I'm not sure.

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Unread 11-05-2011, 05:11 AM   #2
TheBoogieman
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4.10 if you do a lot of highway driving.If not,go with 4.56's.
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Unread 11-05-2011, 07:06 AM   #3
greene69
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I have the same setup and like my 4.10's they are good for highway driving also.
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Unread 11-05-2011, 07:25 AM   #4
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Originally Posted by greene69 View Post
I have the same setup and like my 4.10's they are good for highway driving also.
Your sig says you have 41.0's.
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Unread 11-05-2011, 09:01 AM   #5
unlimitedlj
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Yea 4.10's because anything lower than that you will be stuck going only 60mph with that 32rh unless you want to hang the rings out the tail pipe.
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Unread 11-05-2011, 09:48 AM   #6
Wheelin98TJ
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4.10 or 4.56. 4.56 if you think you'll go to 35s someday.

4.10 with 33" tires = 3,200 RPM at 70 MPH.

4.56 with 33" tires = 3,500 RPM at 70 MPH.
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Unread 11-06-2011, 12:00 AM   #7
rwilson93
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Thanks for the input. By the way should I or shouldn't I put in lockers when I do the re-gear? Do they make that big of a difference for off roading?
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Unread 11-06-2011, 11:03 AM   #8
RowJ
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Quote:
Originally Posted by rwilson93 View Post
... should I or shouldn't I put in lockers.....
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
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Unread 11-06-2011, 02:25 PM   #9
TJRoberto
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Quote:
Originally Posted by Wheelin98TJ
4.10 or 4.56. 4.56 if you think you'll go to 35s someday.

4.10 with 33" tires = 3,200 RPM at 70 MPH.

4.56 with 33" tires = 3,500 RPM at 70 MPH.
Would you know the estimated RPMs of a 32rh tranny with 35" tires and 4.56 gears ?

using JeepForum app
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Unread 11-06-2011, 02:30 PM   #10
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Originally Posted by TJRoberto View Post
Would you know the estimated RPMs of a 32rh tranny with 35" tires and 4.56 gears ?

using JeepForum app
You can use the link in my sig to figure out any combo you like. Gear Calculator
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Unread 11-06-2011, 02:35 PM   #11
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Quote:
Originally Posted by TJRoberto View Post
Would you know the estimated RPMs of a 32rh tranny with 35" tires and 4.56 gears ?

using JeepForum app
About 2,750 engine RPM at 60 MPH.

Thats where mine runs...
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Unread 11-06-2011, 03:26 PM   #12
Wheelin98TJ
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Quote:
Originally Posted by TJRoberto View Post
Would you know the estimated RPMs of a 32rh tranny with 35" tires and 4.56 gears ?

using JeepForum app
I used to have the 32rh auto in my TJ with 35" tires and 4.56.

It ran 3,200 RPM at 70 MPH.

The RPM formula (or an RPM calculator) will tell you 3,064 RPM, however the actual RPM is slightly higher due to most 35" tires being shorter than 35" and there is a little drivetrain loss.
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Unread 11-06-2011, 04:52 PM   #13
Jerry Bransford
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Quote:
Originally Posted by Wheelin98TJ View Post
I used to have the 32rh auto in my TJ with 35" tires and 4.56.

It ran 3,200 RPM at 70 MPH.
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.
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Unread 11-06-2011, 05:29 PM   #14
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I run 4.10 and it seems perfect for me,
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Unread 11-06-2011, 08:57 PM   #15
rwilson93
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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
Good advice. I only do mild off roading so i think just a smple re-gear will be the way to go for me.
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