Can you use the stock 4l80e slip yoke with the stock t56 driveshaft? The u-joints look the same size. I see a lot of info about getting a th400 yoke but I have the one that was on the 4l80e. Looking to see if I can put it on the stock t56 driveshaft.

 

yes you can, with an adapter u joint (depending on the size of the joint in the yoke).

 

FYI the stock 4l80e yoke worked with the stock driveshaft with a conversion u-jonit at napa #447.