hi, so i recently bought this 90 gxl last week..and its an automatic...the previous owner sold it pretty cheap because the transmission wont shift past 3rd and no reverse...i was wondering if theres a quick fix, like maybe replace a sensor, tranny flush..etc... if there isnt, i might just do a manual conversion..thanks for reading!!!

 

how many miles? what color is the tranny fluid? It might turn out to be an expensive PITA to diagnose/fix. Also you will find no love for auto slushboxes here, so I think a manual gearbox will be in your future.