Originally Posted by nickelaz
So my mechanic in town said the 760 / 795 or 90's / 785 joints do not fit right!
Pretty sure he used the 795 or 90s on the Ball with a new kit inside of it.
I started out with getting 785s, then went to a 760, now to a 795/90 and he replaced it with one from a Chevy.
Well needless to say it is vibrating the hell out of the jeep in 4wd!
You're mixing p/ns together that cover two different sizes of your Jeep, the front axle shafts and the driveshafts which take two different types of u-joints.
The TJ's axle shafts use a 297 size u-joint which is the Spicer 5-297x that the factory installs. An upgrade for the axleshaft's 5-297x is the 5-760x.
The driveshaft uses a 1310 size u-joint (NOT the same as a 297 or 760) and a good upgrade for that is the Spicer 5-785x.
Based on what your mechanic has tried and done, I'd fire him and find a more competent mechanic that knows what u-joints go where.