I just had the TSB performed for the driveline "clunk" at start-up and the fix was to have the dealer remove the rear driveshaft and regrease the splines at the center support. They were supposed to mark the position of the rear driveshaft at the front and rear mounting points (at the rear axle and center support). It appears the they only marked it at the rear axle. Now I have a significant vibration when towing. Doesn't happen without a load. I believe that if the 2-piece driveshaft is not phased properly vibration is possible.

So... I need someone to crawl under their unmolested truck with a two piece driveshaft and note the position of the yoke welded to the back of the front driveshaft with respect to the yoke welded to the back of the rear driveshaft. Are they in-line with each other or at 90 degrees offset (1/4 turn)?

Thanks!

 

If you're talking about the "U" at the back-end of each shaft... mine is offset 90 degrees (1/4 turned). I've had this TSB done, can see alinement marks on both shafts.

 

Yep. The yoke welded to each end of the driveshaft. Sounds like they should be offset by 90 degrees. That is a the way a 1-piece driveshaft is built. Thanks for checking!