vibation going down the road

1993 CHEVROLET S-10
99,000 MILES
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DON V1961
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My s-10 vibrates going down the road when i let off the gas it stops.It doesn't do it when in park.I have changed one motor mount other one is okay,i changed transmission mount,changed center bearing on drive shaft.I can't figure what could be the problem.Could it be the transmission causing this.Please help.I put new tires on back front tires are fine
Dec 24, 2011 at 4:30 PM
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FIXITMR
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i wonder if you jacked up rear and had someone run it in gear you could spot what's what?
Dec 24, 2011 at 4:45 PM
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DON V1961
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no havent done that
Dec 24, 2011 at 4:49 PM
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RAHOFFMAN
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Are you sure,its not a u joint?
Dec 24, 2011 at 7:00 PM
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MHPAUTOS
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Is the vibration in the body or the steering wheel? if body only check tyres and rims and uni's first.
Dec 25, 2011 at 8:10 AM
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DON V1961
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Its in the body and i had new tires speed bal. when put on,i did a visual inspect.on front tires,i had uni's visually inspected and was told they was good,is there a machine i could have it put on to pin point it without doing more guesswork
Dec 25, 2011 at 4:58 PM
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RAHOFFMAN
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Were the u joints removed to inspect them?not sure you could tell otherwise. That in itself is'nt costly,its knowing how to install them w/o damaging them.
Is the vibration more towards the front or the back?
A machine?Lol>
Dec 25, 2011 at 5:28 PM
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DON V1961
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No i just had a machanic go under the truck and check the u joints,i mean visualy inspect them,im not a machanic which i know the ones that have answered my question have already figured out,lol and i realy appriciate the answers you g uys have gave me and any other help i realy do appreciate
Dec 25, 2011 at 7:21 PM
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DON V1961
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Also its more toward the front and Merry Christmas to everybody
Dec 25, 2011 at 7:27 PM