thump

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coreyg

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I've only had the car since november of 2015 so I dont know what has been done to the car. It has a 727 torque and a 8 3/4 rear end. When I put it in reverse it makes a big thump and it lunges backward, and same when I go into drive. Even when the brakes are applied it moves kinda like getting hit by another car at very low speed. What do I need to look at/for. If you need more info let me know. Thanks
 
How high is the idle??? The higher the idle the harder it goes into gear!! Only needs to be 600-800!! Just thinking out loud here!
 
Idle is around 700. I'll get under it tomorrow a check the u joints
 
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