I have just replaced the A670 in this 93 Caravan with what appeared to be a "used" rebuilt A670, that was included in the sale of the van.
The original transmission had what appeared to be many needle bearings and at the bottom of the pan. That old transmission was removed and replaced with the "spare" A670 with near new looking T.C. After considerable time taken to re & re the transmission, carefully seating the TC onto the pump and buttoning up the trans. it's clean pan was inspected with no debris and a clean magnet. I could see that there was a newer Sonax reverse band strut beside the valve body. This give me some assurance that it had been worked on. Fresh ATF was carefully filled and vehicle shifted correctly in all gears. THe van drove beautifully.
But today was a different story. Today she reversed out of the garage, someone took it out for a 5 minute test drive, with correct shifting. When they returned, there was no reverse!!!!!!
The fluid was check and a small amount was added. There is not fluid leaking. Linkages seem correct but no reverse.
Now what? I took on this project with the assurance that the spare trans was good. And perhaps it still is.
Any suggestions before I swap this out.
Thanks in advance
Aldergrove