Quote Originally Posted by DIBaledo View Post
Ay idea what type of modification. The only thing I could think of that would make a difference is to make the spline shorter.
Do not cut the spline. Really bad idea. It's designed to have a certain amount of engagement. But shouldn't be necessary and if you're seeing an inch difference, not likely to fit anyway. Bottom line, what you describe is a sign of the wrong driveshaft length. I've done multiple builds and never had trouble getting a proper sized driveshaft installed without taking anything apart. Takes some maneuvering and wonky angles. But should go in. I see multiple builds were guys are taking things apart and eventually get it in. But that's the hard way. Check these instructions from Denny's Driveshafts (an excellent source) and see how the result compares to your driveshaft. https://www.dennysdriveshaft.com/img...iagrams/k.html