Gearing on a 90 ?

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candymancan
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Gearing on a 90 ?

Post by candymancan » Wed Jul 01, 2020 8:09 pm

Was reading this article on axle gearing for FSJs and tire sizes.. and it mentioned to not go over stock tire size with 2.73 gearing. And 3.31 would be good for up to 31..

Well i want 31s on my Jeep and im getting 2 inch AAL lift for the front and back . After i fix my frame by the gas tank soon.

But im starting to wonder what gearing would my 90 Have ? When i did the diff fluid awhile back when i first got it. I noticed it had the limited slip tag on it but the long tag for the axle ratio was too rusted for me to see what it was. I was told back then that the limited slips were 2.73. So if this is the case can i not go 31s lol ?

Also I wish i took a better look but do cherokee golden eagles have 44 rear and fronts ? Wouldnt i be able to just take the gears outa a 79 i found and swap em into my 90 ? Would it be a direct fit ? Ive never done this before so just curious. Not sure what the eagle has for gearing.. but im sure its better then 2.72/3 whatever it is lol
1998 Jeep Grand Cherokee 5.9L Limited 197k
1998 Jeep Grand Cherokee 4.0 I6 laredo 299k
1990 Jeep Grand Wagoneer 138k


Topic author
candymancan
Posts: 2453
Joined: Tue Mar 22, 2016 11:32 pm

Re: Gearing on a 90 ?

Post by candymancan » Wed Jul 01, 2020 9:03 pm

Found my tag. Its hard to tell but does that say 3.31 on the bottom left ? Is that where itd be printed on the tag ?

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1998 Jeep Grand Cherokee 5.9L Limited 197k
1998 Jeep Grand Cherokee 4.0 I6 laredo 299k
1990 Jeep Grand Wagoneer 138k

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Stuka
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Re: Gearing on a 90 ?

Post by Stuka » Wed Jul 01, 2020 9:12 pm

3.31 was available on Grand Wagoneers that came equipped with the tow package. The standard gear ratio was 2.73, so you got the better of the two.

A '79 would have either 3.07 or 3.54 gears.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


Topic author
candymancan
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Re: Gearing on a 90 ?

Post by candymancan » Wed Jul 01, 2020 9:44 pm

Okay thanks. I just wasnt sure if that says 3.31 or not its so rusted and it has 20 other numbers.. just wanted to be sure. Mine does have all the wiring and plug in the back for trailers so i guess that also answers that.

Just no hitch.. all it had were remnants of a hitch once being there.

I still wonder if i should go back and look to see what the 79 has. If its got 3.54 would it be worth taking thrm.. Maybe for the future ?
1998 Jeep Grand Cherokee 5.9L Limited 197k
1998 Jeep Grand Cherokee 4.0 I6 laredo 299k
1990 Jeep Grand Wagoneer 138k

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fulsizjeep
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Re: Gearing on a 90 ?

Post by fulsizjeep » Thu Jul 02, 2020 6:01 am

There isn't that much difference between 3.31 and 3.54. Sounds like a lot of work for little gain with taller tires.
Flint Boardman ~ http://jubileejeeps.org
Embracing the Borg Warner QuadraTrac since 1980 http://jubileejeeps.org/quadratrac
88 GW, 401/727/208, 5" lift, D44s/4.10s/locked up, 35s, a few Evil Twin mods, http://eviltwinfab.com and a few TT's Fabworks mods, http://www.ttsfabworks.com
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Stuka
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Re: Gearing on a 90 ?

Post by Stuka » Thu Jul 02, 2020 7:43 am

The cost to rehear to 3.54 would not nearly be worth it. The gears themselves are pretty cheap even new. It’s the labor that is costly. They are not a simple bolt in item.
1981 J10 AMC 258 with HEI and Weber 32/36 DGEV Carb, T176, NP208, D44/M23 with 4.56 gears and Detroit Locker, 6" lift, 33x12.50 Cooper STT's, BJ's Offroad Rear Dozer Bumper.
2017 JKU Rubicon Lifted and stuff
Pevious Jeeps: 1975 Cherokee, 2008 JK, 2005 KJ, 1989 XJ


Topic author
candymancan
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Joined: Tue Mar 22, 2016 11:32 pm

Re: Gearing on a 90 ?

Post by candymancan » Thu Jul 02, 2020 9:07 pm

Okay then ill leave it be
1998 Jeep Grand Cherokee 5.9L Limited 197k
1998 Jeep Grand Cherokee 4.0 I6 laredo 299k
1990 Jeep Grand Wagoneer 138k

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