Join Date: Dec 2008
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If it does this while in N, then pull the little access plug and check your T/C bolts, before you do anything else--could be loose. It may be something else but I would go over everything I could on the bellhousing, flexplate, t/c, and anything else you can get your hands on in the drivetrain, just to check tightness/torque.
If you find that it isnt drivetrain then at least you'll know it'll be safe to drive without failure.......drivetrain wise.
89 w250 project truck