For those not familiar with my recent build my 98 had a 4" frankenlift with the stock skid and 1.25" drop. I replaced all arms with Savvy adjustables. I also installed: JBC SS SYE, UCF ultra high skid with lowpro mount, and a double cardan drive shaft. The tcase slope is 4° and ds is 19.75" long. I initially set ds and pinion angle at 22.5°.
1st and 2nd are smooth, around 25mph I get a moderate vibe that slackeneds about 35. At 50 change in the console starts to rattle then stops at 70. This happens at acceleration, steady speed, and deceleration. If I shift into neutral at speed the vibes stop while I coast.
What I have tried.
I reduced the pa so the ds was 1° higher, 22° and 23° respectively. No change. I went to the drive line shop that built my ds and took a tech for a ride. He recommended dropping pa to 2° differential. Tried it and no change. I reset ds/pa to 23°/22° and removed the rear ds, it drives smooth as silk. I am having the ds rechecked today for any problems.
Thoughts or advice are welcome. Thanks