Hi, I just recently put on a OME lift (4x 36R)... it appears that I got somewhere almost 4" of lift out of it (sounds big, but bottom of rocker panels now sit at 22.5" on BFG TA/KO 31s, see the pic here
When it was installed, we only anticipated 2-3" and so didn't do a TC drop right away. I also had smaller tires on it (Wrangler Radials P235/75R15), which may have made the lift seem a bit smaller. We test drove it and there was minimal vibration (only when coming off the throttle and engine-braking), and we expected the lift would a settle bit.
Over the past two days, the vibrations have gotten significantly worse. The gear shifter vibrates a lot when accelerating from a standstill, up to somewhere between 5-10mph, after which it settles down. While cruising or at highway speeds, I can still feel a bit more vibration that pre-lift, but overall it's acceptable.
I've been researching a bit more on driveline angles (I'm a newbie to this), and took some pictures this morning (see attached).
The current angles seem to be 'exactly wrong'? (TC output & rear-pinion are at different angles, whereas they should be as close to parallel as possible?)
The rear axle leafpack came with a small shim on it, and the u-bolt kit came with 2deg shims which we added as well (so probably around 3-4deg total). This seems to have the effect of tilting the pinion upwards, and creates a different angle?
In looking at various articles/posts, the current driveshaft angles seem like they'd be appropriate for a CV (double cardan) driveshaft, but not a stock U-joint driveshaft?
I'm also wondering if the angle of the TC case / slip-yolk seems normal, or if it's evidently under strain?
I appreciate any help & insights on this. Thanks