Does aftermarket make a Rotor Flex? I'm looking at this for a vibration issue on accel up hills 40-45 goes away after that.

U joints are all new, flex joint is soft. I can almost make the bolts touch tip to tip when felxed!?

Is it supposed to be this soft?

 

How many miles on your truck, does the roto flex have cracks between the 6 bolts? After market roto flexes are junk and wear out quickly. Might want to buy one from Rover Connection.

 

no not cracked at all, just more flexible then I expected.

 

Normally the disk will last at least 80,000 miles or more so if you still have a vibration I would check the front drive shaft and make sure all 3 u-joints have greae fittings.