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I just put in a rebuild c-4 in my '70. When I shift into reverse it really gives a big "jerk," regardless of engine speed. All forward gears are smooth as silk.

Should I worry or should I be looking at new u-joints?

Thanks for the help.

Tom
 

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I'm far from an automatic expert but from my days working in the parts department of a Chevy dealer, IIRC, there's usually a spring to cushion the shock. If the spring fails, a sharp "clunk" is fealt, that's what the spring is for.
 

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Hey Tom, where does this spring go? In the shifter handle....ring and pinion.....U-joint....valve body.....carb throttle return? Tell me more please. John
 

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On 350 Turbohydramatics, it was internal. But also check u joints for slop along with the rest of the drivetrain.

When the spring goes in the tranny, as I recall, it resulted with a lot of harshness.
 
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