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It does have an OME lift - 2.5” maybe(? 33s fit). I measured angles before I replaced the U joints. The angles of xfer output shaft and the rear diff are within a degree or two. Drive shaft angle isn’t extreme.
This is almost exactly how I would describe the issue. Only it gets more pronounced at a very specific speed. Sounds almost like a jackhammer sound. If I grab the tcase knob I can quiet it down a little.I had a similar problem problem, but only happened when I was pushing on the gas pedal. Sounded almost like a truck engine braking and came with a rattle/rumble. Castor shims fixed it.
This could be the case, but the front of the diff goes up under load. I would think, however, only under hard acceleration, climbing, or towing. Just cruising it shouldn't be torquing that much if at all. But, like you said, if it is already on the edge of being out of parallel, might happen.Got several possibles here: worn spline (some rotational play is ok, there should be no up/down play), out of phase yokes, and now maybe pinion angle interactions...
When under power the rear pinion rolls down. The 40s rear DS is so short that it doesn't take much pinion rotation to excite a DS problem, especially if the rear is already on the closed side of that few degrees of delta...
You've got some options. Will be interesting to see what does the trick.
Engine is smooth as silk with no load. Timing is set at 7deg with an newish DUI and the Sniper is doing its job with fuel delivery.Multiple possibilities.
I’d suggest starting by isolating the “issue” a little more.
If it’s noticeable in any gear at 2000 PRM and you think it’s engine related, what happens when you bri g the RPMs up to 2000 when not in gear ( sitting still )?!
Georg @ Valley Hybrids @ Cruiser Brothers
Message me with your number and I’ll give you a call to help figure this out.Engine is smooth as silk with no load. Timing is set at 7deg with an newish DUI and the Sniper is doing its job with fuel delivery.
My bet is drive shafts out of phase, I forgot but I fixed that first, then did caster shim to improve steering. It is a super simple check/fix (phasing). But Georg will know, he's the expert. Very kind of him to lend some help. Good luck and be sure to report back on what it ends up being.This is almost exactly how I would describe the issue. Only it gets more pronounced at a very specific speed. Sounds almost like a jackhammer sound. If I grab the tcase knob I can quiet it down a little.
It has some rotational play - maybe a couple of degrees. No other looseness.Thats short enough that the 2 deg may cause that vibe, but I am sticking with worn splines on the slip. Is the rear pinion loose ?
Or throw some shims on the spring pack to angle down. Whatever is easiest.Thoughts on axle wrap? Was thinking I might put a camera down there and drive around to see what I see.
Here’s my logic:
- the diff is already angled up by 1-2 degrees relative to the tcase
- the symptoms occur only under load and maybe most pronounced in the torque-iest range
- when I hit the gas, if it is axle wrap, the diff would angle up even more
Eh?
DM’dGeorg offered a phone call. You should take him up on this.
When under power the rear pinion rolls down. T
Or throw some shims on the spring pack to angle down. Whatever is easiest.