I have a GMC full size Van, 2500 series. 350 4BBL. I was wondering if anyone could tell me what the transmission is? I have the vin # and all the rpo codes. The vin decoder on this site only works with f-bodies, and it did not turn up in the RPO decoder, everything else turned up, and it said it couldnt find like 4 of the codes.

Thanks

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Godti
'89 Trans Am (Red)
305 TBI 5spd

 

What year?

 

It's probably a turbo 350, but some trucks had variations of the th350.

 

Depends on the year, some full size vans had a TH350,400,700R4,blah,blah,blah....

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

GO #3

 

Sorry about that, its an 84. I was told its a heavy duty engine, if that helps.

[This message has been edited by Godti (edited February 15, 2001).]

 

You can always look at the shape of the transmission pan...

 

If its a 3 speed auto, its probably a TH400.

If its a 4 speed O/D trans than its a 700R4.

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ASE Mechanic/Machinist/Smog Tech

1999 NBM Trans Am
1986 Chevy 3/4 ton pick up
1981 corvette
1995 Kawi ZX6R

GO #3

 

Probably a turbo 350 if it's a 3-speed, or a 700 if it has OD.

If it's a 3-speed, look at the pan. If it's square, it's a 350. If it's shaped sort of like an oven mitt, it's a 400.

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"So many Mustangs, so little time..."
ICON Motorsports


[This message has been edited by RB83L69 (edited February 15, 2001).]

 

It has OD and the pan is shaped like a rectangle.

 

The OD is the main identifier... you have a 700. Those have square pans too.

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"So many Mustangs, so little time..."
ICON Motorsports