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1971 Mustang Help Diagnosing Vibration in Driveline when put it is put in Reverse

731 Views 2 Replies 3 Participants Last post by  429ragtop
I have a 1971 Mustang Convertible with a 302 and a 3 speed manual transmission. When I put the car in reverse (it is most nonticable in reverse, but happens in 1st when startiing from a stop or a really slow roll, 1mph) and slowly let the clutch off the car starts to vibrate, you can start to feel the vibration even before the car starts to move. When the car starts to move you can see the vibration in the rear tires and rear springs, it has been as bad as to have the tire bounce on the ground like a basket ball. I have changed the flywheel, clutch, pressure plate, and the throw-out bearing, the rear brakes are new and working properly, same as the emergency brake. The vibrartion stops when the car is moving, it just happens when I am first starting off. I am not sure if this vibration is coming from the transmission or the rear end, it shakes the entire car. Any help would be appreciated.
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Yowie, like a basketball?

Did you change your clutch and all because of this vibration, or did it start right after the new one was put in?

I was gonna say your clutch is not slipping properly, if you can describe violent chatter as not proper, but if you changed all that to try and fix it then I am not sure.

An overheated and warped out flywheel can maybe make a clutch chatter.

Here's two wild guesses, maybe it's a damaged spider gear in your diffy or a loose u joint. I can't imagine either of those easing up at speed though, more likely to throw parts all over and just quit.
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