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When I accelerate or go up a hill I have a noticable vibration coming from my drivetrain. It has been that way since I bought it a year ago. I replaced my u-joints and opened up the rear end and all seems fine. Tranny fluid smells a little burnt. Besides a tranny flush, any suggestions or ideas? I have a 1993 sonoma x-cab 2wd 4.3 auto tranny.
 

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2 or 4 wd?
I would avoid the tranny flush if you can. If the tranny was not well maintained in the past a flush now can actually clean up the clutch disks to the point of requiring a rebuild. besides a flush will not fix a vibration anyway.

If you are 4wd you might check your front axles the cv joints may be bad. Could be a bent wheel or hub.
 
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