1988 A4LD won't work in reverse what to do?

[Pheadrus]

Hi
I'm new to the forum and am looking for help in deciding what to do with my 1988 4x4 ranger. The mileage is around 90,000 I think. It has the 2.9 which is in good running shape. It doesn't move when I put it into reverse. What are my options. I'm on disability so money is tight. I've read up on the 4.0 swap but as I said my 2.9 is super clean and runs great. This truck is for daily driving in the winter and not abused. What years of A4LD will work in the truck or is there a fix for the reverse problem? It just revs up but doesn't move when I put into reverse. Could this just be the solenoid or valve body? I also have a 90 F150 and have changed the filter and oil on it as well as the solenoids on my fathers 99 Honda so I can do that kind of work. I've never rebuilt a tranny but might be inclined to do so if it's not particularly difficult. I've been working on cars for about 20 years but mostly older stuff. Any opinions?
Thanks for any opinions or insights, Steve.

 

[stockfornow]

check your fluid level if it is low it could cause your problems