long story short I installed built 4l60e an yank 4k then my stock trans mount broke so I replaced with energy mount an couldn't stand the vibrations so I bought the umi torque arm relocation mount and installed new oem trans mount now the car rides smooth except for cold start.. I can feel in the floor at my feet a ruckus an vibration an a little noise hard to describe tho it lasts for 15 seconds then goes away.. its been doing this for the past month an hasn't gotten worse. im not sure if it was doing this when I had the energy mount in just because everything was shaking .. an im not sure if its from transmission or what.. if I cold start and put it in gear right away it still makes the noise an vibrations for a few seconds.. if I didn't post this in the right section please let me know

 

after about 15 seconds the noise an vibration goes away and everything rides great and shifts great .. I looked underneath it doesn't look like the headers or exhaust is knocking anywhere

 

Maybe the converter drains down and your hearing/feeling the clutch till it pumps up again?

 

I feel like that could definitely be a possibility is that a bad thing will that shorten the life of my converter or damage anything

 

I'll leave that one for the pro's!

 

Have you driven this in the winter yet?

I ask, because I have a weird vibration in the winter. Only in the winter. I have NEVER figured it out. I have changed I think, EVERYTHING. Engine, Transmission, Wheels, Axles, ALL mounts, Torque Converter, Drive line angles, Driveshaft.....

 

I do not drive it in the winter

 

It honestly does feel like the converter is empty on fluid an it takes 10 second's to get fluid back in it

 

What if you parked it overnight with the rear up a little? That would tell you if it's draining from the car sitting.

 

I will try that today.. good idea on trouble shooting it... I will start the car let it run for a but then raise the rear an leave it for a day

 

Okay I took the car for a drive came home raise the rear end about 2 and 1/2 ft let it sit for 24 hours and I just started the car it still makes the noise so now my thought is to remove the Umi relocation mount and install my stock one to see if the vibration is still there

 

Found the problem.. when I installed the new umi torque arm relocation mount.. the corner of it was touching my passenger side of my y pipe.. I trimmed it just enough to clear the y pipe started the car an no vibration. . Thanks guys for your help another problem fixed through ls1tech

 

Woohoo, glad to hear you found the problem!

 

Good job! Glad it was nothing with the trans.

 

I am very happy that it wasn't the trans. Next I am going 5o unhook sway bar end links and see if I notice a difference on the street.. seems like some people say they notice it a whole lot an others didnt notice it at all.. I don't do auto cross an it's not my dd if I am hauling *** with the car is on a straightaway

 

I took my SB out years ago. It works great with the calvert 90/10 shocks at the track...but doesn't do **** on the street.
I mean the front comes up but it blows the tires off.
I do have to watch hi speed turns though.
The pizza cutters on the front don't help either.
Here's how they work at the track with drag radials.