XJ6 & XJ12 Series I, II & III 1968-1992

Borg Warner 66 Trans Slipping

Thread Tools
 
Search this Thread
 
  #1  
Old 06-08-2023, 08:55 AM
Childeric12's Avatar
Senior Member
Thread Starter
Join Date: Aug 2022
Posts: 165
Received 61 Likes on 40 Posts
Default Borg Warner 66 Trans Slipping

Hi Everyone!

My transmission seems to be slipping in reverse only. It will back up ok if on a flat surface but, it will slip if I back up on a slight grade. I checked and tightened the bands which were loose. I also adjusted the ATF level. Car has only 41,000 miles. Just curious if anyone thinks this might be repairable without having to rebuild the whole transmission? I know it is difficult to say without actually seeing the car, etc. I'm just curious what everyone thinks. Thanks!!
 
  #2  
Old 06-10-2023, 06:57 AM
metalbasher's Avatar
Senior Member
Join Date: Jul 2017
Location: Hudson, NC
Posts: 256
Received 283 Likes on 118 Posts
Default

Sounds like the reverse band is adjusted incorrectly or there is a hydraulic pressure issue with the servo that actuates the reverse band. Your valve body could also be dirty. Did you change the fluid and filter screen or just add ATF?
 
  #3  
Old 06-10-2023, 02:00 PM
Childeric12's Avatar
Senior Member
Thread Starter
Join Date: Aug 2022
Posts: 165
Received 61 Likes on 40 Posts
Default

I just topped off the ATF. It was 1 1/2 quarts low. I adjusted the reverse band to 5 ft pounds and then backed off 3/4 of a turn.
 
  #4  
Old 06-14-2023, 10:08 PM
Childeric12's Avatar
Senior Member
Thread Starter
Join Date: Aug 2022
Posts: 165
Received 61 Likes on 40 Posts
Default

I tightened the bands a bit more (5 ft/lbs and then back off 1/4 turn) and it is better, but still slips under load. I'm thinking of trying 5 ft/lbs and not backing off at all to see if that is better. Any thoughts?
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
metalmarty
X-Type ( X400 )
19
11-03-2014 06:42 PM
86jag
XJ6 & XJ12 Series I, II & III
4
05-23-2013 04:35 PM
todski2
XJ40 ( XJ81 )
4
07-23-2012 02:00 AM
jonre
X-Type ( X400 )
4
04-30-2010 03:16 PM
jensenguy
XJ XJ8 / XJR ( X308 )
2
08-14-2009 12:43 PM

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


Quick Reply: Borg Warner 66 Trans Slipping



All times are GMT -5. The time now is 07:17 AM.