January 21, 2016Bought my custom 1996 F150 pictured in Feb. 2015 w/25k original miles. A man had bought it new, drove it for 2 years, passed away. Then was stored and driven only enough to keep it in proper shape.
The only thing wrong with it after complete servicing and new tires, exhaust, and a few minor things was an annoying clunk in the rear when starting from a dead stop w/ moderate acceleration. I pulled my hair out trying to find it. Changed radius arm bushings, rear swaybar bushings, fixed dragging rear brakes which were masking the problem. No Joy.
Finally found your forum and went into the driveline section. Pretty soon came upon my exact problem description by numerous posters. I have been on many other forums and never encountered this discrepancy.
So, the person who first came up with the fix said grease the main driveshaft front yoke because it is dry and sticking.
So I cleaned and greased it yesterday and it is completely fixed. Truck drives like it just rolled out of the showroom.
Thanks a lot, guys!