Transmission issue - Jeep Cherokee Forum
Jeep Cherokee Forum


Transmission issue

Reply
 
 
 
Thread Tools Search this Thread
Old 01-14-2011, 12:59 PM   #1
Junior Member
Thread Starter
 
Join Date: Jan 2011
Location: Tulsa, OK
Posts: 35

View OKBrian's Photo Album My Photos
Default Transmission issue

I have a 1990 4x4 xj with 4.0L & automatic trans. The problem is, intermittently the trans has delayed shifting (engine revs higher) from 1st to 2nd. From 3rd to 4th is just fine. sometimes the shift from 1st to 2nd is just fine as well. Any ideas? Thx for any help!
OKBrian is offline   Reply With Quote
Old 01-14-2011, 03:17 PM   #2
"CF Moderator"
 
TrekkerJmm's Avatar
 
Join Date: Sep 2008
Location: N.J. Shore Area
Posts: 3,045

View TrekkerJmm's Photo Album My Photos
Default

Quote:
Originally Posted by OKBrian View Post
I have a 1990 4x4 xj with 4.0L & automatic trans. The problem is, intermittently the trans has delayed shifting (engine revs higher) from 1st to 2nd. From 3rd to 4th is just fine. sometimes the shift from 1st to 2nd is just fine as well. Any ideas? Thx for any help!
Hi and welcome to CF from Tj...How many miles on the Trans/fluid?
TrekkerJmm is offline   Reply With Quote
Old 01-14-2011, 03:32 PM   #3
CF Veteran
 
BuckB91XJ's Avatar
 
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,989

View BuckB91XJ's Photo Album My Photos
Default

There is a servo in the AW4 that controls that 1-2 shift. It could be getting worn out. If you drive around a lot like crawling trails for instance with your tranny selector in your lowest gear which in the AW4 is 1-2 because it doesn't give you the ability to select 1st and 2nd gear individually. Having your gear shifter in that position and crawling around will cause your tranny to constantly be hunting between 1st and 2nd gear. If you or the previous owner of your Jeep did this alot it could cause that 1-2 servo to wear out and cause slipping or a pause between those two gears.
BuckB91XJ is offline   Reply With Quote
Old 01-14-2011, 04:49 PM   #4
Junior Member
Thread Starter
 
Join Date: Jan 2011
Location: Tulsa, OK
Posts: 35

View OKBrian's Photo Album My Photos
Default

Quote:
Originally Posted by TrekkerJmm View Post
Hi and welcome to CF from Tj...How many miles on the Trans/fluid?
I unfortunately don't know. The fluid is not filthy but it's not clean/new either. I was planning on changing it soon.
OKBrian is offline   Reply With Quote
Old 01-14-2011, 05:13 PM   #5
Junior Member
Thread Starter
 
Join Date: Jan 2011
Location: Tulsa, OK
Posts: 35

View OKBrian's Photo Album My Photos
Default

Quote:
Originally Posted by BuckB91XJ View Post
There is a servo in the AW4 that controls that 1-2 shift. It could be getting worn out. If you drive around a lot like crawling trails for instance with your tranny selector in your lowest gear which in the AW4 is 1-2 because it doesn't give you the ability to select 1st and 2nd gear individually. Having your gear shifter in that position and crawling around will cause your tranny to constantly be hunting between 1st and 2nd gear. If you or the previous owner of your Jeep did this alot it could cause that 1-2 servo to wear out and cause slipping or a pause between those two gears.
Is the servo a tough fix or replacement? Could it be the TCU?

Last edited by OKBrian; 01-14-2011 at 05:20 PM.
OKBrian is offline   Reply With Quote
Old 01-14-2011, 05:23 PM   #6
CF Veteran
 
BuckB91XJ's Avatar
 
Join Date: Nov 2008
Location: Oak Harbor, WA.
Posts: 6,989

View BuckB91XJ's Photo Album My Photos
Default

Honestly bro I've never had to do it to my rig yet. Sorry I can't help you with that. Awhile back I found a way to put in a toggle switch and manually turn my TCU on and off. If you come to a complete stop i.e. your tranny is in 1st gear then I flip the switch turning my TCU off. Then, I can crawl around on the trails all day without the tranny stuck in 1st gear until I flip the switch back turning my TCU back on and she shifts automatically like normal again.
BuckB91XJ is offline   Reply With Quote
Old 02-09-2011, 02:29 PM   #7
Junior Member
Thread Starter
 
Join Date: Jan 2011
Location: Tulsa, OK
Posts: 35

View OKBrian's Photo Album My Photos
Default

bump...anyone else with any ideas I changed the transmission fluid & filter and installed a new TPS. Still the same problem.
OKBrian is offline   Reply With Quote
Old 02-09-2011, 02:45 PM   #8
Seasoned Member
 
SamSissine2's Avatar
 
Join Date: Jan 2011
Location: Charlotte, NC
Posts: 313

View SamSissine2's Photo Album My Photos
Default

what kind of fluid are you using.?
SamSissine2 is offline   Reply With Quote
Old 02-09-2011, 02:49 PM   #9
Junior Member
Thread Starter
 
Join Date: Jan 2011
Location: Tulsa, OK
Posts: 35

View OKBrian's Photo Album My Photos
Default

Dex III
OKBrian is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Trans temp gauge sensor location question BruceB OEM Cherokee Technical. All factory issues and info go here! 16 01-11-2017 06:32 PM
New to Cherokee Forums Need help MidwestNick OEM Cherokee Technical. All factory issues and info go here! 10 02-28-2016 03:05 AM
AW4 P0753 issue heat related Psiegrist1 OEM Cherokee Technical. All factory issues and info go here! 9 09-30-2015 10:45 PM
'94 XJ won't shift until warm. Programbo OEM Cherokee Technical. All factory issues and info go here! 21 09-26-2015 12:32 PM



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 Off
Refbacks are Off



All times are GMT -5. The time now is 02:20 PM.