GM Venture doing the Herky-Jerky

While driving will a high whinning sound shortly followed by a banging sound as the transmission changes gears. Then proceeds into a herky-jerky motion if you continue to keep driving.
If you stop the car and turn off the engine for a few minutes and restart then the van will run fine for awhile. Had the same problem with a Pontaic Transport. In both cases the mechanics could not find the problem. Any help would be greatly appreciated.
Dave Geauvreau
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Don't know about the whining, but the banging while gear changing sounds like a transmission problem to me. Did you take it to a transmission shop?
Ed

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Going to take it into the trqnsmission shop not that is not the main pro9blem. Thanks anyway for your reply,
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@#@
A lot of jerking off on this newsgroup, better get an good grip.
Ray

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