Polyurethane Transmission Mount
 

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?

Re: Polyurethane Transmission Mount
 

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.

Re: Polyurethane Transmission Mount
 

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.

Re: Polyurethane Transmission Mount
 

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

Re: Polyurethane Transmission Mount
 

See Below

Re: Polyurethane Transmission Mount
 

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

Re: Polyurethane Transmission Mount
 

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..

Re: Polyurethane Transmission Mount
 

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 .?

Re: Polyurethane Transmission Mount
 

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.

Re: Polyurethane Transmission Mount
 

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.

Re: Polyurethane Transmission Mount
 

I ran a polyurathane mount and it cost me over $1,500
to fix all the broken parts that it caused.The trans case
was junk the drive shaft was trash too. No it wasn't from no flex.
The mount totally came apart the rubber didn't stick to the metal.
That's my experience and unless someone guarantees is wont
happen again I will stick to a stock mount.

Re: Polyurethane Transmission Mount
 

I agree with Mike Gray. I have owned two 2x3 chassis framed cars and have run steel motor/mid plates and SOLID trans mounts in both cars and have never cracked a case. The new/old SS'er back halve has a poly mount due to not having enough chassis stiffness.