the tach will stop working and the motor bumps hard during acceleration on 1990 Ford Thunderbird SC

in gear but in nuetral the motor does not bump, than the tach will start working and everything is fine

by in Columbus, OH on February 02, 2012
1 answer
ANSWER by on February 02, 2012
You can check motor mounts to make sure they are still good but, this sounds like a tranfer case/front differential problem. Need to get vechicle off ground put into gear, and observe unit to see if this the problem.

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