Driveshaft angle

[Burnin vernon]

Hello there I have a 1977 cj7. It has a 4 inch lift kit with 35 inch tires. Was wondering what the driveshaft and pinion angle should be. . I keep spitting out u joints. The last time it spit out the yolk and bent it all to hell. I just ran the rubicon trail and made it through alright but when we got back on the road it vibrates like hell. Thanks for any info you can give me. Thanks Kirk

 

[Blackjack]

Are you still running a two joint shaft or has it been converted to double cardan?

 

[Burnin vernon]

Yes two joint shafts

 

[Blackjack]

With leaf spring rigs I recommend keeping the pinion 2 degrees low to make up for axle wrap. It may also be time to consider a double cardan shaft to decrease the ujoint operating angles.