TLDR, I have rhythmic (dynamic) vibrations above 63mph that won't go away, no matter the pinion angle.
I've tested more than 30 different pinion/ds angle combinations from above and below and I always have the same dynamic vibrations. Sometimes worse, some times better, and one time constant vibrations (could not duplicate), but never gone. I use a digital angle finder to the tenth of a degree. I measure angles on the back of the Dana 35 housing, and the slip shaft.
Relevant modifications:
Savvy double adjustable upper and lower arms.
JB Conversions super short SYE
Tom woods dc ds (balanced twice locally)
UCF belly up skid (full tummy tuck with BL & MML)
Rough Country rear coil spring correction plates
3.73 & 31 (30.5inch) tires
I Didn't have this problem before the SYE and double cardan drive shaft.
I've had the tires rebalanced and rotated - no changes
With the rear ds removed the dynamic vibrations are gone
At this point I either live with it or take the entire jeep to a shop and throw money at whatever the problem is
I'd rather fix it in my shop, what would you guys do next?
I've tested more than 30 different pinion/ds angle combinations from above and below and I always have the same dynamic vibrations. Sometimes worse, some times better, and one time constant vibrations (could not duplicate), but never gone. I use a digital angle finder to the tenth of a degree. I measure angles on the back of the Dana 35 housing, and the slip shaft.
Relevant modifications:
Savvy double adjustable upper and lower arms.
JB Conversions super short SYE
Tom woods dc ds (balanced twice locally)
UCF belly up skid (full tummy tuck with BL & MML)
Rough Country rear coil spring correction plates
3.73 & 31 (30.5inch) tires
I Didn't have this problem before the SYE and double cardan drive shaft.
I've had the tires rebalanced and rotated - no changes
With the rear ds removed the dynamic vibrations are gone
At this point I either live with it or take the entire jeep to a shop and throw money at whatever the problem is
I'd rather fix it in my shop, what would you guys do next?
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