Vinson shifter

[jay's 300]

I was wondering if there's somewhere you can download a service manual or a detailed description on adjusting the shift linkage on an auto Vinson. My friends Vinson sticks in gear (mostly reverse) sometimes, he said it just all of a sudden started happening and I was going to try and see if adjusting would take care of the problem. If anyone has any input on this problem, it would be appreciated.

Thanks, Jason