what motor would a '71 J20 have?

[seventynine]

I found a '71 J20 9200 GVW flat bed. The guy thinks it has a 350 in it...Buick maybe? Would that be right for a '71? I would have thought it would have had an AMC motor by then?

It's a four speed...would that be a T-18?

Thanks,
Dean

[Elliott]

A couple issues with this guys add, there were no J20's in 1971... it may be a J4000 however.
There were no JTrucks rated at over 8,600 GVWR and that was only the dually.
If it's a 4sp it is a T18 if original and yes the 350 was available up into '72 and IIRC it could even be special ordered in '73.

If it's a J4000 I think the top GVWR was, what? 7,600? I have it in my TSM at home but it'll be on the VIN tag.

[seventynine]

Ok...well they are supposed to send me some more pics. He said he bought it new in '71. I'll let you know what I find out.

Are the T-18s that bolt up to a Buick 350 interchangeable with the ones from the 360s? ie...is the input shaft the same length?

[teckhardt]

Are the T-18s that bolt up to a Buick 350 interchangeable with the ones from the 360s? ie...is the input shaft the same length?

I dont think they are, the Buick does not have the long input shaft and uses a BOP (Buick Olds Pontiac) bellhousing pattern.

[Bill Moore]

If it's a J4000 I think the top GVWR was, what? 7,600? I have it in my TSM at home but it'll be on the VIN tag. I know in 72 it was 8000

[Elliott]

Are the T-18s that bolt up to a Buick 350 interchangeable with the ones from the 360s? ie...is the input shaft the same length?

The inputs are the same. There is a difference in the Buick bellhousing and the adapter to the tranny. The Buick bell is about 9" and the spacer was 3 something, I can measure those when I get home if required.

[fulsizjeep]

I know in 72 it was 8000True and the heaviest J20 was rated 8400.