Vibration at Deceleration

AJ/FormS said

This is classic pinion angle grief.
Under deceleration, engine compression is yanking the pinion nose down. So either the springs are soft (unlikely), the tranny mount is torn (possible),or loose, or the pinion angle needs checking and/or readjusting (most likely).There's also a slim chance that; one or more U-joints is loose or that the driveshaft is too short.http://www.drivelineserviceofpittsbu...-do-you-need-1

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Thanks for the reply. I called the local driveshaft shop. They advised me how to check the driveshaft length. I'm going to check the length then take it down to their shop. I'll have them adjust the length if necessary and check out the u-joints. I remember using the old tranny mount and thinking I should replace it. I'll get a new one. I also tried to replace the rear u-joint but couldn't remove the old one.