I put a Strange S60 in my TTA and shortly thereafter took my car in for a rebuild of my 200R4. Art Carr told me my custom driveshaft (42") is about an inch too short and was barely catching the bushing in the transmission. Based on my numbers below the shop is right as I found my length should be 43 1/8".

There is very little data about exactly driveshaft lengths on the internet but I spent about 30min of research today and here are the numbers I've arrived at:

3rd gen Firebird 84-92 with 700R4 and stock rear end:
41.5"
3rd gen Firebird with 700R4 and Strange S60
40 1/8" (I called Strange to get this)

TTA with 200R4 and stock rear end:
44.5" (I added 3" because the 200R4 tail is 3" shorter than the 700R4)
TTA with 200R4 and Strange S60
43 1/8" (I'm subtracting 1 and 3/8" for the S60 swap. I got this from the 700R4 differences)

Feel free to add EXACT lengths to this thread for other 3rd gen applications! Let's get this to sticky status This was a $200 mistake I could have avoided having this knowledge in the first place.

 

Slide the slip yoke into transmission and pull it back out 1". Measure from center of u-joint to center of u-joint. That's the only precise measurement you're going to need for your car's setup. Anything other than that is just a guess with no guarantee that it will be correct. If you're going to get a custom shaft made, might as well give them the proper measurement.

 

Agreed, this is what I didn't now how to do before I ordered the custom driveshaft. They didn't tell me to do this either when they didn't know what length it should be....

 

I used these guy s and their diagram they have other s on their site but this will help ya http://www.dennysdriveshaft.com/app/...iagrams/b.html