Originally Posted by Cmr0z28

Frank is offically god when it comes to anything 4L60E related.

Originally Posted by mike 96 ws6

I installed an ES poly trans mount in mine which was a different thickness than the stock mount and it caused my Pacesetter LT header on the drivers side to hit the floorboard and changed the angle of the driveshaft vs transmission output shaft. I had to fab some 1/2" thich spacers to install between the crossmember and chassis in order to correct that angle and get the header off of the floorboard. But the ES bushing still transfered too much vibes for my nerves to stand. I imagine since I had some DS vibe, even with the stock mount, another driveshaft may have solved a good bit of that vibe problem but I didn't try that.
And, Matt, I know you've seen my solution before but I'll link a picture or two for anyone else with this problem with the ES specs being different than stock causing header clearance and DS angle problems.
And I also eliminated that spacer and it certainly helped, but the vibe thing was still there, although much better.
BTW: I thought you had a source for a different DS. Did that deal not happen?
Spacers 1
Spacers 2
Spacers 3
That didn't seem to work, lets try this one
http://216.77.188.54/coDataImages/p/...ushpartnos.jpg

Originally Posted by 89385formula

So perhaps the reason I didn't get any increased vibration could be from the fact that I put a better, new aluminum DS in at the same time as the clutch, and poly mount? I am not questioning you guys, I am just trying to figure out what made it like this. I went from a T56 to an A4, and now I am going back to the T56. I want to run the poly mount because of the strength issue. I guess I will just put it back together and see how it goes, maybe I'll get lucky again and have 0 extra vibrations.

Originally Posted by mike 96 ws6

There were several factory LT1 application driveshafts with vibe issues that were never addressed with a factory recall but rather a TSB Bulletin No.: 67-41-01
The corrective measures included:
"Install alternate propeller shaft,
Part Number 10085375."
That part # would be an aluminum LS1 application type unit and since you replaced the original part with a different one is likely the reason you escaped having an issue with this after your T56 poly mount install.

Originally Posted by 1SlowFormula

Not sure why Matt didn't respond back yet, but the reason he went back to the poly mount was he killed the LS1 mount in a really short time, If I recal less then a month or so... So not sure if I would say there was a good comprmise there?

Originally Posted by Bersaglieri

According to what he told me online a few nights ago, he thought he ripped the LS1, but when he checked it was actually fine. Cause I was going to buy his LS1 mount from him but he seemed like he wanted to keep it.

All cars are going to be different. Mine shakes so badly that I can see the floorboards flexing and my passenger seat looks like a space shuttle launch. The dash and every bounces around. Its pretty bad, especially at 65mph+

-Dustin-