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getting the u-joints replaced finally!!!! No more *POP* when i hit the gas. will this free up a little hp? also will it help gas mileage?
 

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A sloppy u joint may free up a fraction of a horsepower at the rear wheels if the driveshaft is spinning eccentric to center.
I've also seen frozen universal joints cause a shakey dyno number vs a smooth one.
Reason is it takes power to bend the joint back and forth but again, minor and the more driveshaft angle the more it would be a problem.
 
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