Canada204

iTrader: (3)

I have 94 Z28 Auto with a 6 speed rear end so higher gear ratio 70mph = 2700rpm

My problem is I keep on breaking stock mounts

I broke my last mount witch was purchased from piston ring within 30 miles lol

Is a GM mount better how about another rubber mount?

I dont really want to go to poly worried about vibrations.

rufrntn

You need to make sacrafices if you want to go fast. But from what I've understand the poly mount is still only medium strength. I can't remember the brand or the name of the mount but there's one that's more stiff than the poly. I'm getting a poly mount when my transmission gets rebuilt in 3 weeks.

Jays_SSZ28

iTrader: (2)

You need a mount with a steel interlock, either externally like stock or internally like most polyurethane.
Most cheap parts store mounts just have steel mount points which is fine for the hundreds of applications from the 60's to present.

The problem with f bodies and these cheap mounts is the torque arm lifting up on it, with no interlock it breaks.

Kevin01Z28

iTrader: (8)

Those rpm's are high for 3.42 gears. If your worried about vibration I wouldn't go with poly mounts. Some get away with it, some dont. I would look into removing the TA from the trans either with a relocation bracket or a tunnel mounted one. I broke one stock trans mount awhile back. Haven't had a problem with my tunnel mounted torque arm.