Have you ever tried hammering a nail into a board that you are just holding in your hands? Since your hands aren't rigid, the force of the nail simply causes the board to move, and the nail will not penetrate. The only way for the nail to actually penetrate is if the board is held rigid. In the case of the diff or transmission, the rubber mounts allow the vibration energy to pass through the bearings to the casing and rubber mounts. However, if you make the mounts rigid, the energy will stay between the moving parts, which will increase wear.

 

So how do these do much more then a bling factor and how would it be any different if aftermarket mounts were installed?

 

I have the EVS red collars on my ap1. i bought the car and was changing out the diff fluid when i noticed the collars.

my car vibrates like a motherf#$% on the highway. anything above 75 and its vibration city.
anyone think its the mounts causing the vibrations? and what the hell do these things even do?!

 

Throttle response. ^ i have a stage two puddydad in it so im not worried about wear on the diff but i am if its stress on the tranny. Ive gone all the way back to stock and then installed the collars and it still vibrates so this must have always been there just never noticed it till i installed them. Though when i take out the forward small collars it goes away with the back bigger collars still in and those 4 are really what increases the feeling of response because they dont allow the diff to twist so vincefriday you could try doing that. Im gonna try doing it and ill let you know if it cuts down on driveshaft vibration. Should have bought my s brand new "smh" i got mine with 20k on it.

 

So these are like a cheap way of avoiding buying different mounts for the time being lol

 

No IMO solid j's mounts are just way to much stress for what its worth (performance factor). These allow about 3/32's of play.

 

This exactly right. Something got to give. Just like making more HP, it will reduce life on your engine. However, like the example above, if the diff is hold rigid, power transfer is better. It is always a balancing act of power and reliability.

 

The collars don't make the mounts entirely rigid though. They rest on the rubber, so there's still some play in the drive train; the collars just clean up some of that slack when you're on and off the throttle in a race situation. Your analogy is correct, I just don't think that these diff collars will reduce the life of any of the vital components by any significant amount.

 

What if you combine these with the exedium engine mount rings then everything but the transfer would be stiff no?

 

I have the same thing, exedium collars on oem mounts and it feels fine.