Polyurethane Transmission Mount

[njk53]

Do any of you guys use a polyurethane transmission mount? I know you can't solid mount the transmission but, is there any advantage/disadvantage in using polyurethane?

[Myron Piatek]

As far as I know, there are no disadvantages!
It is much more durable than rubber, "gives" less but still absorbs vibration, lasts indefinitely under normal use and therefore will not cause the back of the engine/trans assembly to move around and/or settle like old, worn out rubber mounts will do. Worn out rubber mounts will cause header clearance and driveshaft alignment/pinion angle problems.

[Chris1529]

I use energy suspension poly trans mount. Been in the car since '99. no problems.
My dad also has one in his 83 street mustang. stick car.

[njk53]

Myron/Chris this is for a stock eliminator car. You hear the horror stories of broken transmission cases because of solid mounting. Being the fact that polyurethane is much stiffer in durometer, I don't want to run the risk of causing damage to the transmission.
Thanks for the replys

[njk53]

See Below

[partsbob67]

i,ve been running one in my l/sa car for the last 11/2 years and have had no problems.

[Myron Piatek]

Even when I had a 2x3 chassis bracket Challenger, I stayed with a rubber trans mount, but would not have hesitated to use poly. I may not have known about it back then. But I have run a poly mount in my stocker since I got it and it and it's great material for the spool-style motor mounts too..

[larrylomascolo]

Moroso advertises a solid trans mount for auto and stick application ,now can someone tell me the use of that part,i used a solid with a stick and have seen some solid with auto,,.if no one uses a solid why do they still sell it .?

[buzzinhalfdozen]

Originally Posted by larrylomascolo

Moroso advertises a solid trans mount for auto and stick application ,now can someone tell me the use of that part,i used a solid with a stick and have seen some solid with auto,,.if no one uses a solid why do they still sell it .?

Simple they still sell it because people still buy them, that being said yes you can run a solid mount but I think the question would be why would you want to? Every car has flex whether it's being driven down the highway or the drag strip, don't really care how much "chassis" you have it will still flex to some degree. Now if that flex is in the area between the engine attachment points and the trans mount guess whats gonna happen.......Joe , I've welded up many cracked cases for racers out of everything from door cars to dragsters and after asking a few questions I almost always hear " i don't run a mount" or " I run a solid mount" seems pretty simple that twist or vibration would be the common factor here.

[Mike Gray]

Originally Posted by larrylomascolo

Moroso advertises a solid trans mount for auto and stick application ,now can someone tell me the use of that part,i used a solid with a stick and have seen some solid with auto,,.if no one uses a solid why do they still sell it .?

I ran a solid mount for years with no problems. Like mentioned I don't think you could get away with it in a car that has any flex. My super-gas car ran both a C-6 and then a powerglide both with solid mounts and no troubles. Car had a stiff chassis with motor plate, mid mount and trans mount.