As the title states, with my Delta build, I have a 200R4 trans and a 1993 9C1 Caprice 8.5" 10 bolt rear. I picked up a driveshaft for it from a 1976 Pontiac Grand Prix (same body as the Cutlass) for $35.

Looking in the area, just to have an extra one on hand and I notice the 73-77 A body cars, there are 2 different listings for the driveshaft. A 2 door listing and a 4 door listing.

The 4 door listing has cars in it like the 80's Custom Cruiser, 80's Caprice, early 80's Olds 98. and the 2 door listing is mainly cars that are 73-77 A body cars.

Is there a difference in length? How much of a difference is there?

 

Oh, I'd say four inches.

The 73-77 cars used the same 112" wheelbase for 2drs and 116" wheelbase for 4drs as the 68-72 cars. The 1977-1990 B-body cars all used a 116" wheelbase. These "downsized" B-bodies use a frame and suspension that is very similar to that on the 73-77 A-body 4dr cars.

 

the should also be differences due to which automatic installed, the 2004r has the same length as the thm350 and takes the same yoke, so, if you have THAT old driveshaft running around, you should find joy.

aside from asking if he B body track was the same as the A body for the axle, is there a nose length difference from the type O you should have had to the type C you now have? time to play with tape measures.

edited to add: for some reason I thot you dunked this in a cutlass. so the part about the trannys being the same length, BUT, I recall at some point really long tailshaft 350s being put in the B cars with like 3 inches overall length difference. what does the GP driveshaft look like when dry fitted?

 

So, I need to be looking for a 4 door car driveshaft. the list is bigger for the 4 door car, which includes the Custom cruiser from the 80's

I look for the cars with teh turbo 350. I know the 200r4 is the same length as the 350 as well as using the same yoke. I planned this build out a little bit better

 

All 1977-1990 B-body cars of any body style used the same 116" wheelbase. Be aware that they did use different rear axles, however, which can lead to slight differences in driveshaft length.

 

Why put yourself through all of this? Simply measure with the trans & rear end in place with the car on the ground and have a new one made. Not expensive and its new.
Look for a driveshaft house in your area. Dennys has a great instruction sheet in the link below which shows how to properly measure for driveshafts. It will at minimum give you the right length shaft you need used or new.

http://www.dennysdriveshaft.com/how_to_measure.html

 

Then I need the 112" shaft. I put an 8.5" rear from a Caprice on my car


I'll have to loo into that. Thanks !

 

Please go back and read my posts again. If you are talking about your 1985 D88, it has a 116" wheelbase. The minor differences in shaft length due to the rear axle are less than an inch, not four inches.