Thanks for the info guys,I'll have to get a custom shaft made for my car then.My '72 Duster was built with a /6,3 on the tree & an 8 3/4 ,I installed a 440 & a B body 4 speed with a 7290 slip yoke,also installed a 7290 pinion yoke,I figured that if a 340 / auto Duster used the bigger joints that...