Can anyone help me on this ?
I can get from the USA a polyurethane bushing insert for the auto gearbox mount on my Forester.
The hardest one is rated "85A on a Durometer" and a Comfort one at "75A"
What do these figures mean and is it possible to compare the 75A to a standard Subaru rubber bush ? . It fits under the centre of the car, right by the driver's seat, so any increase in NVH would be apparent. I don't mind a little increase but wondered just how 'brick hard' a 75A bush might be and what the level of flex/compliance might be in comparison to an oem one ?

Thanks

JBL

 

Any help/ideas out there ?

JBL

 

Final attempt to find an answer.

JBL

 

usual the choice is between concrete or reinforced concrete.
If sound and vibration is a problem get the softer ones.
harshness is no comparison against OEM ones. they are in a different league