denny's heavy duty drive shaft. perfect shape

STEEL drive shaft material

u-joints are as follows from denny's website. drop in on grand nationals with 8.50 10 bolt rears and 200-4r trans

GM 3R S44 Series Spicer Maintenance Free Universal Joint. Replacement for the original equipment u-joints on stock steel driveshafts. Very strong , high mileage with no greasy mess splattered all over your beautifully restored chassis

GM 3R S44 series measures
3.625 inches wide in both directions cap to cap
All 4 bearing caps are 1.125 inch diameter with inside "C" Clips to lock the cap in place.
The span between the yoke inner surfaces where the "C" Clips lock in is 2.562 inches