Figured it’s time to start a thread for this one. Been chasing vibrations for over a month now.
Started out with no vibrations, but the bushings in my lower RE control arms went out. Ordered some Savvy lower arms. Before the Savvy lower arms showed up my Adam’s Off-road Front driveshaft started making the angry sparrows noise so I pulled it out. Still no vibrations.
Savvy lower control arms arrived. I installed these and set the length to match the RE arms I removed. I believe they were all 16”. A new Tom Woods front driveshaft arrived and I installed it. Had vibrations starting at 65mph. Brought home and checked the pinion angle, it was around 5-6 I believe and the driveshaft angle was 10.5. I shortened The front lower control arms to try and gain some pinion angle and ended up with the arms set at 15.75” and the pinion was at 7-8 and driveshaft 10.5. Still had vibrations but they started at 70mph now. Pulled the front driveshaft and the vibrations go away. I email Tom Woods and they sent out a replacement shaft that is triple check for balance.
Fast forward to current. I now have savvy front upper control arms installed and the new Tom Woods driveshaft. My pinion is at 8 and the driveshaft is at 10. Caster angle is approximately 4.5. I still have vibrations at 70mph and faster.
It is smooth as butter from 0 to 65 and then at 70 is starts, you can feel it in the whole jeep and see it in the rear view mirror. The vibrations aren’t as bad now with the second shaft from Tom Woods but still there. I’ve driven it enough with the front shaft out to be pretty positive it’s coming from the front end. I’ve had some private conversations with a couple members on here and we are pretty stumped currently. Attached is my most recent alignment reading and the previous alignment reading. The only thing that was adjust between the 2 was the caster angle, shop was trying to get my pinion up higher. Hoping maybe @mrblaine will give some insight.
First alignment
Second after adjusting caster
Started out with no vibrations, but the bushings in my lower RE control arms went out. Ordered some Savvy lower arms. Before the Savvy lower arms showed up my Adam’s Off-road Front driveshaft started making the angry sparrows noise so I pulled it out. Still no vibrations.
Savvy lower control arms arrived. I installed these and set the length to match the RE arms I removed. I believe they were all 16”. A new Tom Woods front driveshaft arrived and I installed it. Had vibrations starting at 65mph. Brought home and checked the pinion angle, it was around 5-6 I believe and the driveshaft angle was 10.5. I shortened The front lower control arms to try and gain some pinion angle and ended up with the arms set at 15.75” and the pinion was at 7-8 and driveshaft 10.5. Still had vibrations but they started at 70mph now. Pulled the front driveshaft and the vibrations go away. I email Tom Woods and they sent out a replacement shaft that is triple check for balance.
Fast forward to current. I now have savvy front upper control arms installed and the new Tom Woods driveshaft. My pinion is at 8 and the driveshaft is at 10. Caster angle is approximately 4.5. I still have vibrations at 70mph and faster.
It is smooth as butter from 0 to 65 and then at 70 is starts, you can feel it in the whole jeep and see it in the rear view mirror. The vibrations aren’t as bad now with the second shaft from Tom Woods but still there. I’ve driven it enough with the front shaft out to be pretty positive it’s coming from the front end. I’ve had some private conversations with a couple members on here and we are pretty stumped currently. Attached is my most recent alignment reading and the previous alignment reading. The only thing that was adjust between the 2 was the caster angle, shop was trying to get my pinion up higher. Hoping maybe @mrblaine will give some insight.
First alignment
Second after adjusting caster