Doug I just posted what the man told me. (don't shoot the messenger!)
It's probably a 4 spd, but he said 3 spd several times that is how I posted it.
(he doesn't really know much at all about it he found it sitting, contacted the owner by email, made a deal on buying it and now it's in his front yard being cut up as we
I asked what model GM bus it was and he told me GMC.
So I then said I know it's a GMC. But what model?
He said about a 1980 something! LOL!
I told him no I mean is it a 4104, 4106, 4905?
He told me he had no idea just that it had a good V71 8 cylinder engine in it!
So I had him go find and read me the VIN and he told me it's a 1997 PD4106!
I said "I can assure you it's NOT a 1997 ! That is serial # 1997 and it's a PD4106 model GM."