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.
The input shaft length is different for the ZR1 and L98/LT1/LT4 ZF 6 speed transmissions. The ZR1 version has a longer input shaft. I do not remember how much longer. Contact the ZF Doc for specifics and whether or not the input shaft can be exchange for a L98/LT1/LT4 into a ZR1 box.