1991 manule trani prob will not go in reverse 1500

[butler]

Alll of the other gears in this truck work just fine. but i needed a second opinon on what i tought was wrong with the trani because im not as smart with trucks as most of you guys are. plz help i dont wanna fork over the money to buy a whole new trani if it is just a bushing or sumthing like that.

hey tnx for readin all. oh here is sum of the specs 1991 1500, silverado ,v8 5sp

[re-tired]

try unscewing the backup switch. had one seize up and would not let rod move.