Does anybody know if a solid trans mount can be used in a street application. I recently put solid motor and tranny mounts in car i'm restoring. After reading a compitetion engineering catelog I'm wondering if i made a mistake. Their catalog states that a solid trans mount is never to be used in a street application because it will damage the tranny casing. Are they not to be used when using factory motor mounts or are they not to be used at all on the street. I don't see how any damage could be done if the motor and trany are bolted solid, but i can see how damage could be done if only the tranny was bolted solid and the catalog doesn't clearly state this. Anybody ever done this before and know if it can be done. Thanks.

 

Hummm, I would expect that you would get terrible vibration with a solid mount.

 

I would think that without the little bit of give a solid mount doesnt offer will break things. in other words when you take off the extra torque may break the tranny case..I would just go back to the stock mounts ..better to be save then sorry.

 

Solid mounts are good for strong engines although they do transmit vibrations. I would not use a solid trans mount under no circumstances. They problem is with the chassis. A stock framed car or truck will flex. This is what breaks the tailshaft housing. The front of the frame will flex more than the middle of the frame. Only with a race car chassis that is very stiff could you use a solid mount. However, in drag racing, most people around here use a front and mid plate to hold the engine and then a rubber mount to support the tailshaft housing. Some people don't even run a trans mount. I have broke one tailshaft housing on a powerglide in my race truck over the last few years and I didn't run a rear mount. In my new 25.1d chassis, it will be stiff enough that I will run a rubber mount, front and mid engine plates, and struts on the sides of the engine block to keep it from moving front to rear. I would put in solid motor mounts and a rubber trans mount. All the tranny mount has to hold up the rear of the trans. There will not be that much stress on the trans mount. The solid front mounts will hold most the torque. Dave

 

Thanks for all the great info. I would use factory mounts, but neither the engine nor the tranny were available in the pacticular car they are currently in. i fabricated both a new tranny mount and motor mounts to get the combination to fit. to devise a rubber tranny mount would take some substantial re-structuring. Would mounting the cross member on rubber on which the tranny mount is located suffice as a rubber mount or does it have to be rubber mounted at the point where the tranny contacts the cross member?Thanks again.