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Thread: Bad driveshaft vibration - May I?

  1. #1
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    My Van(s):
    '95 Previa S/C Alltrac
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    Bad driveshaft vibration - May I?

    My '95 Alltrac has a really bad driveshaft vibration when accelerating so I'm thinking it might be out-of-balance -
    Also thinking the U-joints are shot because there's a little *hesitation then catch* clunk half the time when accelerator pedal is depressed at speed.

    I recently replaced a *destroyed* carrier bearing hoping that would fix the problem, but no luck.
    For what it's worth, the 'SADS' couplers are also new.

    I've been sinking a lot of money into the van, and can't quite bring myself to spend the $1000+ to put into driveshaft replacements right now.
    I'm wondering:

    How to identify whether it's the FWD or RWD shaft that's causing the issue?
    Can I disconnect the problem shaft to possibly eliminate the vibration issue? (And just have a temporary 2WD Previa?)
    If I'm correct on diagnosis...that these are symptoms of viscous coupler problem?

    Help much appreciated!
    Last edited by blankenship; 06-13-2022 at 02:37 PM.

  2. #2
    Van Addict
    My Van(s):
    97 Previa DX SC AWD...alive! 95 Previa LE SC AWD (RIP) 93 Previa LE AWD (rustbucket w/ no reverse...parts van) 91 Previa LE AWD (RIP)
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    Re: Bad driveshaft vibration - May I?

    you should be able to grab the shaft near the joint and feel for play in it in order to determine which u-joint is at fault. You cant drive the 95 far without the rear shaft, the van will lose all drive power and you'll need a tow. Earlier ones (at least the 91) weren't as "smart", so you could drive without it but you absolutely needed the emergency brake when parked because "Park" wouldn't hold.

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