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Unread 01-18-2014, 11:01 PM   #1
Firemandan
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Best gears for a 95' YJ 4cyl 31" tires

Hey guys, I know there are millions of threads about gears and such but all I'm seeing are for 33" tires. I have new 31" tires on my Daily Drive and it sucks! I already know about the motor being VERY under powered and stuff but I also know of guys with 4cly going at least 65mph on the highway and interstate. Mine hasn't been over 50mph, very slow on take off and weak as crap on the smallest of inclines. I'm not looking for speed, just be able to drive it to work and not get ran over on the interstate. The rpms are, I think, low at 48mph, around 1500-1800. What would be a good gear swap for a daily drive that might see some dirt on the weekends?
Thanks for all the help for this question and the ones in the past.

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Unread 01-19-2014, 12:23 AM   #2
RockWoRM
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It will depend on whether it is a auto or 5sp. Then there will be the usual discussion on whether to waste $$ on re-gearing the turdy 5. However, typically the ratio of choice for a banger is 4.88.



WRM
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Unread 01-19-2014, 02:04 AM   #3
Luuca
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4.88 are too high for 31" tires. 4.10 is probably best for manual trans
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Unread 01-19-2014, 03:25 AM   #4
Force
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my DD is a 92 YJ 4cyl w/ 31s... factory 4.10 and I regularly run 75-80 mph on the interstate... getting 17mpg... the secret, don't use 5th... 5th gear is an overdrive, it's designed to lower the RPMs, on a 2.5l, that just gets you under the power curve, the Jeep performs like crap, and your gas mileage goes south
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Unread 01-19-2014, 07:49 AM   #5
Firemandan
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Rock, it is a 5 speed.

Lucca, I can't even get to 5th gear.
Force, so you really feel the 4:10 is the way to go?
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Unread 01-19-2014, 08:07 AM   #6
Richard_
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Quote:
Originally Posted by Firemandan View Post
Rock, it is a 5 speed.

Lucca, I can't even get to 5th gear.
Force, so you really feel the 4:10 is the way to go?
your jeep should already have 4:10 gears
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Unread 01-19-2014, 08:30 AM   #7
Luuca
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Quote:
Originally Posted by Luuca View Post
4.88 are too high for 31" tires. 4.10 is probably best for manual trans
Quote:
Originally Posted by Firemandan View Post
Rock, it is a 5 speed.

Lucca, I can't even get to 5th gear.
Force, so you really feel the 4:10 is the way to go?
What gears are in it now? what shape is the engine in?
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Unread 01-19-2014, 08:34 AM   #8
Norcal_chris
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Maybe someone hoodwinked him and he has a different ratio. I've seen it before.

With 35s and 4.10s I was able to keep 4th and do 65 without much issue. 4.56 and 33s I could use 5th on fairly flat areas.


Oh and the 2.5 doesn't have much power till about 2600rpms.
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Unread 01-19-2014, 08:48 AM   #9
multmigs
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90,s yj with 6 cyld/5spd came with ridiculous 215/75/15 tires and 3:07 gears from factory... THANKS EPA...

to OP best move i ever made with my YJ was to get 31x10.50 and a set of axles from a similar year 4 cyld which was 4:10.. I probably spent $1000 total and didnt need a lift etc, speeedo was fixed with some plastic gear thing for $10 also
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Unread 01-19-2014, 09:10 AM   #10
Firemandan
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The motor was rebuilt, had to get it sleeved but its a tuff little booger.
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Unread 01-19-2014, 09:12 AM   #11
Firemandan
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I'm not sure what gears are in it now. I was thinking it would be 4:10 or 3:55, I don't have a clue about this gear stuff.
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Unread 01-19-2014, 10:01 AM   #12
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^
99% sure your 5sp banger will have 4.10 already. Therefor, if you're gonna re-gear, then you only have 2 choices... 4.56 or 4.88. That is as high (low) as you can go. But you will not need a new carrier at least. Since you really do not gain much with the 56's, almost all banger owners go with the 88's. If u cannot do 5th now, then you should with 88's. Again, you have to make the choice about gearing the D35. If it is just a DD and you do not use it off road much, then I'm of the opinion to do it. You'll basically be getting a newly rebuilt rear end and it should do you a long time. If you have any intentions of locking it or going to larger meats to wheel, then it is a waste of $$... time to change axles.



WRM
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Unread 01-19-2014, 09:49 PM   #13
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Quote:
Originally Posted by Luuca View Post
4.88 are too high for 31" tires. 4.10 is probably best for manual trans
4.10 and 31's are great for a six cylinder, TJ Rubi's came factory that way.

I have run three different gear ratios on my 2.5L and four different tire sizes. 31" to 33" tires with 4.88 gears is a great setup on the 2.5L.

With the 4.10 gears I couldn't pull 34" tires up slight highway grades without downshifting to 3rd Haha. I'm talking 40mph with the engine at 3200rpm with the hazard lights on. 4.10s and 31's are ok.
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Unread 01-19-2014, 10:20 PM   #14
rebelbowtie
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Quote:
Originally Posted by Luuca
4.88 are too high for 31" tires. 4.10 is probably best for manual trans
4.88 and 31's here with a 5 speed, it's about as ideal as you can get.
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Unread 01-19-2014, 10:37 PM   #15
baritone_mike
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My 88 with the 2.5L 5 speed and 4.10 on 33x12.50 will cruise at an indicated 65mph in 5th on flat ground, going up any small hill I can pull an indicated 60mph in 4th. On the bigger stuff I drop down to 3rd and do an indicated 45mph just to keep the RPM's down, I don't know how I feel about pushing a 25 year old engine with 175k miles on it any higher than 3,500rpm.

It is not fast by any means and will loose to a school bus in a drag race, but it cruises well enough for me and still has enough power in 4lo off road.
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