Originally Posted by Ian Sharpe
all was fine before the conversion to the NP242, ie I had no vibes from the front or the rear. Thus I can eliminate most of the usual causes.

The only thing I can really put it down to it the front shaft given that it does have 12 thou runout. I guess I am just gonna have to bite the bullet & get Tom to make a shaft for me.


Hey, Ian. What kind of shafts are you running? CVs at the t-case outputs with u-joints at the diffs? You're running a solid front DS, correct? Not a two-piece like mine? Is the front DS a slip drive shaft?

What kind exactly and WHEN exactly do you get the vibration in 4WD. On acceleration, deceleration, steady cruise? At what speed? Does it steadily build? Or does it hit 55 and then start up?

"Driveline angles are not excessive, in fact quite mild."

Excessive/mild doesn't necessarily have anything to do with it. Drive line angles change over time.

If you've ruled out everything obvious noted above, its time to check and make sure everything still points where it should. smile When I have fresh springs, everything points exactly where it should, but after a couple years I start getting drive line vibration because the springs eventually sag as does transmission mounts, engine mounts.

Edward

'97 Montero Sport LS 5-Speed 3.5L conversion
SAS Dana 44s & ARBs, 35" Yoko Geolandar M/Ts
NP231 B4R doubler/Terra Low231/RP 5.38 229:1
'99 Montero Sport Limited 4WD SAS 3-link project
'03 Montero Sport Limited AWD
'97 Montero Sport LS 5-Speed 4WD