Sign in to follow this  
Matthew Cody

1991 V6 Transmission Control Module question

Recommended Posts

Posted (edited)

A few months ago I was out at the junkyard getting a few things, there was a 89 V6 minivan that had a newer Mopar reman TCM with the latest software so I grabbed it knowing these updated modules improve the general operation of the A604 transmission. I installed it in my 91, it works fine but I have NO lock up function, engine sits at 3500 RPM at 65 MPH. According to the TSB I read, the proper updated TCM number is 4796121 which is the one I have. Is there some kind of modification I have to make to get the lock-up function to work again? The old module works fine, I just grabbed this one because I know these parts are getting scarce and it would be nice to have the latest software to prolong the longevity of the A604. Already did a fluid and filter change with ATF+4 and a genuine Mopar filter. 

Thanks

Edited by Matthew Cody (see edit history)

Share this post


Link to post
Share on other sites

If it's a reman unit, are you *positive* it's a flashable one?

 

Personally, I would stick with the one that the car came with, but update the solenoid pack and the sensors/pigtails.

Share this post


Link to post
Share on other sites

Yes it's the flash-able one. I used my Snap On scanner to do a quick learn on it prior to the test drive. It shifts just fine, just no lockup function. I did read about a wire that needs to be cut at the connector (if it has it), I need to inspect my TCM connector if it has that wire. 

  • Like 1

Share this post


Link to post
Share on other sites

Oh yeah...I remember that...I think it had something to do with the partial LU function that was causing shuddering.

Share this post


Link to post
Share on other sites

I'm not terribly worried about it, my current TCM works just fine, probably the best shifting A604 I've ever owned probably due to it's super low mileage and fresh ATF+4. I'll scope around the connector and see if it has that PIN. I grabbed the TCM because finding any 1995-older Mopar in the junkyards is hard, let alone a 89-91..need to stockpile hard to find parts. 

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this