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When going from park to reverse or drive to reverse car car jumps with loud noi

(1990 Buick LeSabre)
in Yucaipa, CA on August 22, 2014
one person said the problem is transmission mounts shops tell me it needs a complete internal rebuild does this 90 buick lesabre with the 3.8 motor have transmission mounts and what is their location
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on August 22, 2014
With helper , open hood , have helper get in car and put the parking brake(assumed to be in working order) on and start up car. Watch engine as helper shifts from park-reverse-neutral & drive. Make sure they are also holding brake pedal. In drive & in reverse , quickly tap the throttle (very briefly-just enough to get a 'jump' out of engine) , if it's bouncing all over , that may be a hint that it is a problem with the mounts. On that age vehicle and from others like it I have seen , check for oil leaks that may have soaked the mounts causing earlier than normal failure and replace all mounts.
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