Best gears for a 95' YJ 4cyl 31" tires - JeepForum.com

Reply
 
LinkBack Thread Tools
post #1 of 30 Old 01-19-2014, 12:01 AM Thread Starter
Firemandan
Registered User
1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla
Posts: 182
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.


195? M38
1979 CJ7
1995 YJ
Firemandan is offline  
Sponsored Links
Advertisement
 
post #2 of 30 Old 01-19-2014, 01:23 AM
RockWoRM
Registered User
 
RockWoRM's Avatar
2005 LJ Wrangler 
 
Join Date: Mar 2006
Location: Fresno
Posts: 9,302
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

'05 LJR, 6sp, RC long arm w/MC 6" coils, 5.13 D44's w/chromo shafts, MetalCloak fenders/sliders/body armor, 37x12.50 MTR's, Warn 9.5, RockHard swing out w/full spare. <><
RockWoRM is offline  
post #3 of 30 Old 01-19-2014, 03:04 AM
Luuca
Typical /f12 Hooligan
 
Luuca's Avatar
2005 LJ Wrangler 
 
Join Date: Apr 2012
Location: Corona
Posts: 5,072
4.88 are too high for 31" tires. 4.10 is probably best for manual trans

91 YJ "Alice" 4.0L, AX-15, NP 231 w/HnT Flange, Adams Driveshafts F/R, 2.5" OME 36Rs, 5/8" /f12 Booms, 32" Yoko ATs, 4.10 D30/35 Aussie Lockers F/R
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
YJOTM never
05 LJ Rubicon "Ghost"

Luck Favours The Prepared
Luuca is offline  
post #4 of 30 Old 01-19-2014, 04:25 AM
Force
Registered User
1992 YJ Wrangler 
 
Join Date: Nov 2010
Location: McAlester
Posts: 20
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
Force is offline  
post #5 of 30 Old 01-19-2014, 08:49 AM Thread Starter
Firemandan
Registered User
1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla
Posts: 182
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?

195? M38
1979 CJ7
1995 YJ
Firemandan is offline  
post #6 of 30 Old 01-19-2014, 09:07 AM
Richard_
Registered User
1995 YJ Wrangler 
 
Join Date: Sep 2013
Location: Dallas
Posts: 604
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
Richard_ is offline  
post #7 of 30 Old 01-19-2014, 09:30 AM
Luuca
Typical /f12 Hooligan
 
Luuca's Avatar
2005 LJ Wrangler 
 
Join Date: Apr 2012
Location: Corona
Posts: 5,072
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?

91 YJ "Alice" 4.0L, AX-15, NP 231 w/HnT Flange, Adams Driveshafts F/R, 2.5" OME 36Rs, 5/8" /f12 Booms, 32" Yoko ATs, 4.10 D30/35 Aussie Lockers F/R
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
YJOTM never
05 LJ Rubicon "Ghost"

Luck Favours The Prepared
Luuca is offline  
post #8 of 30 Old 01-19-2014, 09:34 AM
Norcal_chris
Web Wheeler
 
Norcal_chris's Avatar
1995 YJ Wrangler 
 
Join Date: Jan 2012
Location: Sacramento
Posts: 1,066
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.

Ruined a perfectly good jeep.


OCT '13 & OCT '14 YJOTM 2014 YJOTY
Norcal_chris is offline  
post #9 of 30 Old 01-19-2014, 09:48 AM
multmigs
Registered User
2003 WJ 
 
Join Date: Feb 2009
Location: browntown
Posts: 1,198
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
multmigs is offline  
post #10 of 30 Old 01-19-2014, 10:10 AM Thread Starter
Firemandan
Registered User
1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla
Posts: 182
The motor was rebuilt, had to get it sleeved but its a tuff little booger.

195? M38
1979 CJ7
1995 YJ
Firemandan is offline  
post #11 of 30 Old 01-19-2014, 10:12 AM Thread Starter
Firemandan
Registered User
1979 CJ7 
 
Join Date: Nov 2010
Location: McCalla
Posts: 182
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.

195? M38
1979 CJ7
1995 YJ
Firemandan is offline  
post #12 of 30 Old 01-19-2014, 11:01 AM
RockWoRM
Registered User
 
RockWoRM's Avatar
2005 LJ Wrangler 
 
Join Date: Mar 2006
Location: Fresno
Posts: 9,302
^
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

'05 LJR, 6sp, RC long arm w/MC 6" coils, 5.13 D44's w/chromo shafts, MetalCloak fenders/sliders/body armor, 37x12.50 MTR's, Warn 9.5, RockHard swing out w/full spare. <><
RockWoRM is offline  
post #13 of 30 Old 01-19-2014, 10:49 PM
ldso
Registered User
1995 YJ Wrangler 
 
Join Date: Sep 2009
Location: Columbus
Posts: 1,023
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.

1995 YJ "Mabel", 2.5L Muncie SM465 np231j 4.88's HP30 Lockright JK 44 Detroit 33s CJ clip

Actually, it's pronounced "mill-e-wah-que" which is Algonquin for "the good land."
ldso is offline  
post #14 of 30 Old 01-19-2014, 11:20 PM
rebelbowtie
Registered User
2000 XJ Cherokee 
 
Join Date: Jan 2013
Location: Daphne
Posts: 3,178
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.

He's an angel dressed in oilskins; he's a saint in the "Sou'wester,"
He's a pluck as they come, or ever can;
He's a hero born and bred, but it hasn't swelled his head,
For he's just the U.S. Government's hired man.
rebelbowtie is offline  
post #15 of 30 Old 01-19-2014, 11:37 PM
baritone_mike
Registered User
1988 YJ Wrangler 
 
Join Date: Sep 2010
Location: Puyallup
Posts: 2,480
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.

˙ɹǝʌo ɹǝʇndɯoɔ ɹnoʎ dılɟ sıɥʇ pɐǝɹ uɐɔ noʎ ɟı
baritone_mike is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome