When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
I'm not really sure but I do know that you want a short tailshaft housing with the Corvette. If I still had the TH400 sitting in my basement I would just go down and look at it (but I gave it away to my friend).
I still have my original TH400 from when I swaped in a 2004R. I just went out and counted the output shaft splines and measured its aproximate diameter. 32 spline, aprox-- 1 and 5/16" dia.