700r4 trouble in 86 chevy suburban?

George L

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what will cause a violent shudder shake when tranny shifts into overdrive while driving,but stop when i down shift into drive...this is an automatic jasper 700r4 in a 86 suburban with a 96 350 vortec converted to carb.
thanks for the info...this tranny is fairly new..when we put the motor in we put new tranny,but i guess if its gona go its gona go!!!!!!
 
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