jeepsrock said:
thats a good point but wouldnt bad mouunts cause it to happen at all higher rpms not just a specific one (approx 2200) and nothing higher or lower ?
pete
Not necessarily. It's possible, that the mount's are just in the beginning of chracking/braking. Though you don't see anything , under load(2200rpm or else) they might cause those vib's. Is any of the mount's wet, oily? Especialy the tranny/transfer mounts?
Have you checked all the mounting bolts? Engine to Bracket. What about the A/C, Alternator and P/steering pump mounts? Check'em for loose bolts.
Try this to eliminate the engine and tranny mounts from the list.
Take your floorjack, put a piece of 2x4 or whatever on it and place it under your engine, so that you can jack it up. Make sure you don't damage/bent anything.(oilpan, wires, etc.)
Now. Ask your buddy to start the engine, bring it up to the specific rpm's and keep it there. At this time you have to slowly pump up the jack. If the vibration changes, you're on the right track. If not, do the same with the tranny/transfer case. When you think you found it, lower the jack. The vibration/sound should change. Repeat it a couple of times to make sure.
Also check the exhaust mounts. (You might wanna do this before you check the engine mounts.)
First do a visual check of the mounts. Grab the exhaust and move it around, so that the rubber get's a little bit stretched. Next fire 'er up and bring it up to the vibration and slightly touch the tailpipe. If the vib's come from the exhaust, you should feel'em at the tailpipe.
Good Luck.
One more thing. Check the Torqueconverter bolts.