Auto Trans advice needed please
#1
Registered User
Thread Starter
Join Date: Feb 2011
Location: Rio Rancho, NM
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
Auto Trans advice needed please
Guys, I have a 88 3.0 auto. When I bought it a few months ago it had been sitting for 2+ years. I did the head gasket and a few other issues and now am tackling the tranny issue that has been there since I got the truck.
It shift fine in R and thru 1-2-3 but will not go into OD. I disconnected the computer under the console and test drove it shifting manually and OD did engage. So I assumed it was a solenoid issue. I replaced the solenoids (all of them) and I am still not getting OD.
I initially checked everything under the hood so I know it is not an issue there.
Could it be the ECT computer that is an issue? Do these things ever fail? Or is it time for a rebuild on the tranny?
Any advice you can give is greatly appreciated!
Mark
It shift fine in R and thru 1-2-3 but will not go into OD. I disconnected the computer under the console and test drove it shifting manually and OD did engage. So I assumed it was a solenoid issue. I replaced the solenoids (all of them) and I am still not getting OD.
I initially checked everything under the hood so I know it is not an issue there.
Could it be the ECT computer that is an issue? Do these things ever fail? Or is it time for a rebuild on the tranny?
Any advice you can give is greatly appreciated!
Mark
#3
Registered User
Check the temp sensor for the trans ecu to see if the wire is damaged or it has a bad sensor.I am not sure which one it is but it should be next to the engine temp sensor.
x2 on kicking the fool out.
x2 on kicking the fool out.
#4
Registered User
OD also won't work if your fluid level isn't right on, it's really sensitive and can be tricky the way their hot/cold ranges are laid out. Check the manual for the exact temp range and use a thermometer if possible to make sure you're in it. Hot range seems to be more accurate. Might also try flushing and replacing with Valvoline Maxlife, good stuff.
#7
Registered User
Thread Starter
Join Date: Feb 2011
Location: Rio Rancho, NM
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
I don't think that is it, this issue of no OD was happening before and after I replaced water pump and t-stat. Engine operating temp seems not to be the issue.
Keep the ideas coming, I am all ears and my patience is wearing thin...
Keep the ideas coming, I am all ears and my patience is wearing thin...
Trending Topics
#8
Registered User
If you're sure of all this probably time to tear into it. Maybe try the diagnostic but I can't vouch for it personally. Guessing you have the A340H like I'm pretty sure I do on my '88? All the info you'll need from basic to rebuild at
http://www.pirate4x4.com/forum/showthread.php?t=587521
http://www.pirate4x4.com/forum/showthread.php?t=587521
#10
Registered User
Thread Starter
Join Date: Feb 2011
Location: Rio Rancho, NM
Posts: 56
Likes: 0
Received 0 Likes
on
0 Posts
McKenna, I did not change that one. I bought a kit and replaced all that were in the kit (the ones in the tranny)
Could the solenoid in the t-case cause the problem I have described?
Could the solenoid in the t-case cause the problem I have described?
Thread
Thread Starter
Forum
Replies
Last Post