New Automatic Trans - won't Shift

[ETjeep]

Hello All!

 

I have a 1989 Comanche   - replaced the transmission, replaced the TCM and Looking at the Ground Wire?

 

Previous to replacement - Truck could only get 1st gear - So we replaced the trans, can use the steering column to manually shift the trans.

have tried 2 different replacement TCMs 

 

I Read an article about Ground wire on the block is problematic - any ideas / opinions / recommendations ?

[Spinnakerblue89]

Welcome-

 

In the forum you will see a dedicated sub forum to "Cruiser54's mostly Remix Tips", it will identify the common ground points that are suspect, follow the advice given there because refreshing your grounds is a must. 

 

The ground wire on the block (passenger side) can be a problem child for sure. All of them can. I if your valve cover ever leaked or there is oil on that ground point, I cannot imagine that it helps with conductivity. 

[gogmorgo]

Cruiser’s also got a tip on the trans computer itself. There’s an inline fuse that sometimes blows. 
 

There are some year-to-year changes on computers and pin outs. I think just a Renix VS HO thing… don’t remember for sure. But if you put a used computer in you might want to double check it’s compatible.