Did my first rearend swap this summer in my '67 camaro. Replaced the 4:11 with a more streetable '69 3:08. Since this was my first experience with a change, I haven't a clue about my problem. When ever I try to "get on it" the drive shaft slaps the underside of the car under the rear seats. Any help appreciated. Have air shocks and multi-leaf springs....Thanks

Are you sure that it's the drive shaft and not the bolts for the front leaf spring mount being loose. If it isn't tight it will slap the floor loudly. For the rear end to hit the floor, it would really have to move.

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Bob
Garnet Red 69/SS396/TH400/355 Posi
94 HD Dyna Wideglide