Motor Mount Height Question

Rickyd said:

If your profile list is still accurate i have close to the same setup. But with a np231.

I didn't need to raise the motor even more to get the vibes settled. How old are the joints and centering ball in the rear shaft?

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Really the main change that seems to have set this off is the belly up skid. I have some 1" skid spacers (defeating the belly up point, but it was already bought and installed so... at least not a shovel any more) coming to try out instead of adding more height to the motor. Lifting the motor is something I have decided to not be a good idea, as the 1" spacers already led to pinching wires that I had to have repaired above the trans. I may just have to settle for having the transfer case back down. It may be my imagination but it seems to have lost a little acceleration power alongside the vibes/shudder, but could be my subconscious babying it.

In any event I plan to take off the skid to adjust the transfer savvy case shift cable, and will be pulling the rear shaft to see if it developed issues. I tend to doubt it, but covering bases.

JMT said:

@Hasselblad whats your operating angle? That’s what I’m trying to figure out. They max out around 25*. I’m sure there are variances of tolerance among TJ’s.

Do you have a SS SYE?

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Rubicon with DC, and 4 speed bestest trans

That'll Buff said:

Been quietly following this thread since it involves future projects I plan to do. @JMT's mention of the SS SYE reminded me of this thread I read a while back. Assuming it is driveline vibes, seems like it's (unfortunately) your answer as stated in Shawn's answer.

https://wranglertjforum.com/threads/super-short-sye-or-sye.60376/

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But Shawn is talking about 4"+ of driveline lift.

If still light out enough to get under after work, I am going to peek into the hole in the new skid to see if anything is remotely close to it besides the obvious trans mount. The more I think about it the more I am blaming the new vibes on the new drivetrain angle introduced by the belly up. But still plan to pull the shaft and see if the joints failed. If I have to put up with the 1" loss of clearance with the skid spacers, at least I will get back to driving and not so much tinkering. Shit, I still have the EMUs and Ranchos to put on the front.

That'll Buff said:

There's a chance you fit that description. The TeraFlex Belly Up skid says it increases clearance by "up to 2 1/4 inches." Combine that with your 2.5" OME springs and that's 4.75". Sure most people experience the need with a larger spring lift, but seems like going above 4" total is the line. Like you said, the only change is the belly up skid, and again assuming that this is driveline related, that would be the smoking gun. The free.99 solution is like you said, put the T-case drop back on and adjust to see if the vibe is gone. Before that I would take some of the other's advice and check if anything is touching or if something is wrong with the driveshaft. If those come out clean and the drop fixes the vibe, seems like the SS SYE is the solution.

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But again: Rubicon. No SY to E

Sounds familliar
https://wranglertjforum.com/threads/2004-rubicon-driveline-vibrations.13302/