YJ trans issues - JeepForum.com

LinkBack Thread Tools
post #1 of 7 Old 09-16-2010, 12:17 PM Thread Starter
Registered User
1995 XJ Cherokee 
Join Date: Aug 2007
Location: Connecticut
Posts: 804
YJ trans issues

Hokay, im an XJ guy, but a friend of mine got a yj. Its a 90 2.5, 5spd(ax-5??) 231. The trans wont go into 1st gear unless you double clutch it, presuming its in not so good shape cause the PO left it in a swamp for a week, what would a be a good trans to bolt in? AX-15?? AW4?? he would preffer something bolt in but strong.

Are Ax5s really weak? ive heard they are.

bigbike is offline  
Sponsored Links
post #2 of 7 Old 09-16-2010, 12:33 PM
Uncle Paul has spoken...
paultyler's Avatar
1992 YJ Wrangler 
Join Date: Feb 2005
Location: California
Posts: 2,544
Yes they are lightweight. They become an issue when you get larger tires. The issue arises not off road but on the highway. When geared down in 4low they rarely break because there is less stress on them in these situations.

The problems arise when you on underpowered on the highway and roll around with the pedal floored to get your speed up. That's when they usually develop problems. Often what goes is just the 5th gear as it is held on by a snap ring that can pop off....as I am experiencing right now.

As for replacements nothing will simply bolt in. If you get an AX15, which is probably the best option you will need to get a new bellhousing. Plus the shaft on an AX5 is 21 splines and an AX15 is 23 I think. Therefore some modification will be required. Also, your driveshafts may need to be shortened or lengthened. It turns into a modestly expensive job when you consider you can get a used AX5 for $250-$400 and rebuilt one for $750.

This is a dilemma I have faced for years. I have gone through 4 AX5s but each time I simply replaced it.

My Jeep - Video

My Jeep in the Snow

92 YJ, 35' MTR Kevlars, Klune/Dana 20, 4.88s, SYE, Rubicon D44s w/Rubicon lockers, front and rear Alloy USA chromoly shafts with 30 spline outers, JK electric swaybar, T&T tube fenders, custom cv driveshafts, RE 4.5 XD springs, M.O.R.E. 5/8'' boomerang shackles + 2' BL, 15lb Powertank, 4.0L TB & TB spacer, ARB Snorkel, K&N filter, rear bumper and tire rack, Rancho 9000s, AtoZ Rockers, Skid-Row Engine skid plate, Teraflex Bellyup, JCR Offroad 1 Ton TieRod, rock lights, RE hand throttle, M.O.R.E. roll cage, corners, 9000lb winch with synthetic cable in-cab winch controller (12voltguy.com), Dual Blue Top Optimas with 12voltguy dual battery controller, a/c (ackits.com)

Originally Posted by joshrad View Post
This Uncle Paul guy seems to know what he's talking about.
paultyler is offline  
post #3 of 7 Old 09-16-2010, 12:44 PM
Registered User
1995 YJ Wrangler 
Join Date: Feb 2009
Location: Wilmington
Posts: 957
if you can find a dodge dakota with the 2.5l you can take out the entire power and drivetrain. the dakota 2.5l came backed with an AX15 with the necessary bellhousing for adaptation. othersie you can get an ax15 and buy the bellhousing online new (not too pricey forgot site also (or go to dealer)).
CreepyCrawler95 is offline  
post #4 of 7 Old 09-16-2010, 03:55 PM
Registered User
1993 YJ Wrangler 
Join Date: Aug 2009
Location: Oregon Coast
Posts: 1,600
are the 2.5 ax15s better geared than the jeep 4.0 ax15s? I never liked the idea of putting the ax15 on a 2.5 becuase the gears are even higher than the ax5
imstillatwork is offline  
post #5 of 7 Old 09-16-2010, 05:48 PM
Registered User
1991 YJ Wrangler 
Join Date: Mar 2006
Posts: 9
I may be having a problem with my 1991 4.0. Not sure which transmission I have. Are they all the same for the 2.5 4-Cyl. and the 4.0 HO?
mikeys91 is offline  
post #6 of 7 Old 09-16-2010, 09:54 PM
Registered User
1995 YJ Wrangler 
Join Date: Feb 2009
Location: Wilmington
Posts: 957
there is little difference in the gearing of the 2 trannies. since hes running a 4banger hes already got decent (stock) gears...unless youve geared lower. what size tire is your buddy running?
CreepyCrawler95 is offline  
post #7 of 7 Old 09-16-2010, 10:43 PM
Registered User
1995 YJ Wrangler 
Join Date: Feb 2009
Location: Wilmington
Posts: 957
no the 2.5 is backed by the ax5 and the 4.0 is backed with the ax15 for all manual yj models.the BA-10 came behind the 258 I6 i believe only other tranny i know of behind the 4.0 is the nv3550 in tj models...idk about jks
CreepyCrawler95 is offline  

Quick Reply

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


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

Email Address:


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

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
1991 AX15 Trans issues sm23 YJ Wrangler Technical Forum 3 07-23-2010 11:30 AM
trans to motor mounting issues tonythetiger YJ Wrangler Technical Forum 8 09-27-2009 10:17 AM
Having issues with my 5-speed trans. in my wrangler.. Please help me... Bigtone36 YJ Wrangler Technical Forum 4 01-26-2009 04:22 PM
Creaky 03 Clutch and Trans Issues TheChad03 TJ Wrangler Technical Forum 6 01-31-2008 10:00 PM
???? on trans issues heep98 TJ Wrangler Technical Forum 2 11-01-2002 10:48 PM

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