Gears & Axles - Driveshaft and Rearend question?

I have been experience a vibration in my car that I cant seem to figure out where it comes from. At about 70mph I start getting a shake but goes away when I put the car on neutral so I don't think its the tires. The higher the RPMs the more vibration I get. I have an aftermarket torque arm (non adjustable) with a urathane transmission mount. I noticed the shake ever since I replaced my broken (stock) transmission mount and went with the urathane. I think its a bad pinion angle or the driveshaft being unbalanced but I dont have experience in this so I want to know if you guys can help.

I have heard the poly trans mounts tend to vibrate a while till the squish and settle some. I personally would just stick with rubber. I hope you have poly motor mounts to match the tranny mount or say hello to a cracked tailshaft on a hard launch.

the poly trans mount will cause vibratition, may help if you leave the metel spacer off and grind down the two small humps from the new mount, this will help with vibratition
Johnny

I will go home tonight and install a new transmission mount that I bought. It's a Energy suspension one and what I have now is a Prothane. I've done some research and it seems that the Prothane are notorious for being harsh. I will chime in with the results soon.

I installed the energy suspension transmission mount last night. And I just want to say it's like night and day. The car feels alot smoother at the speeds it used to shake with the prothane. I'm happy with the results.

I hope you have poly motor mounts to match the tranny mount or say hello to a cracked tailshaft on a hard launch.

Hello.............:confused::bang:

I do have poly mounts but I never put them on. Lol.

Put em on