Im getting a Vibration mostly noticable when decelerating in second gear. Also starting out in second gear. Only when in gear. If vehicle taken out of gear no vibration is present. I just did a frame swap, and have two rear driveshafts both with new u-joints infront of the third. My third did have some play if ratotated left to right but no vertical play. I had three different sets of tires on and didnt make any difference (new tires as well). Any help is
appreciated.

Thanks,
Mario

 

if it only happens in 2nd, then there may be a problem in the transmission.

 

My truck use to shake when slowing down.. I believe at 20 or 15 mph. I had the tires rotated and realigned, problem went away.

Not sure if that is your same problem but it's worth a try.

 

My 4Runner used to shake like that under acceleration or decceleration, mostly at certain rpms. It was a worn out rear end. My ring and pinion had so much slop and wear that they vibrated. There were 361,000 miles on the 4Runner then. I just swapped in a whole rear 86 truck axle with about 150,000 miles on it.