bad vibration

[coupecop]

I just changed the gears on my car 2 weeks ago since then I have had a bad vibration . I have changed I joints motorMounts transmount and crossmember Bushings . I don't know what else to do can some one help. Thanks in advance

 

[daddystang]

Just a thought, could it be your balancer? Mine started vibrating under acceleration, and I changed the balancer, and it smoothed out.

 

[HISSIN50]

Does it vibrate while stationary or only while driving?

If it's only at considerable speed, the issue might be the stock DS. You can try to index it, or do as many do and get an Alum version. The stock DS's are not balanced all that great and gears get them closer to their critical speed.

Good luck.

 

[coupecop]

It only does it on 4th And 5th gear from 60 to 80 mph

 

[HISSIN50]

Sounds like DS imbalance. Index, balance or replacing yours (with an aluminum piece) is likely going to be the solution.

Good luck.