Transmission to Rear-end
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- Alan Roehrich
- Posts: 3025
- Joined: Tue Jul 04, 2006 4:58 pm
- Location: Murfreesboro TN
Normally caused by chassis flex, or some sort of driveshaft problem. When I was managing a transmission shop that built racing transmissions, I most often saw that in cars with inadequate roll cages, and/or solid transmission mounts. We've always had the best luck using a urethane transmission mount, or a rubber mount with hose clamps. Even with motor plates.
- Posts: 6271
- Joined: Sun Jan 28, 2007 4:42 pm
- Location: Grass Valley, CA :Northern Foothills
Alan Roehrich wrote: and/or solid transmission mounts. We've always had the best luck using a urethane transmission mount, or a rubber mount with hose clamps. Even with motor plates.
Every time with a plate I run a rubber trans mount. It doesn't take much to break the trans...
GURU is only a name.
- Posts: 87
- Joined: Sat Aug 30, 2008 7:12 pm
- Location: Saint Louis
Back in 1993/4 as a young 19 year old with a 400 hp 454 with a turbo 400 in a 12 second malibu. The custom driveshaft was just 1/4'' too long. When driven on the street it wasn't a problem. The second i bolted on slicks and took to the track and had more suspension squat i was cracking cases. Two to be exact before i looked to the 1/4" too long driveshaft. It was just long enough to cause havoc.
- Posts: 1051
- Joined: Tue Aug 10, 2010 8:16 pm
I don't know why people even run solid trans mounts or even urethane ones. All it does is twist the back of the trans, even if the engine is solidly mounted the chassis WILL flex more than the trans can handle. The trans mount only affects the engine's pitch, the engine mounts control the roll, and pitch isn't ever a problem.
- New Member
- Posts: 5
- Joined: Tue Jan 24, 2017 1:03 am
If you run solid motor mounts, make sure you run a rubber transmission. I have seen a few and heard of others TH350's breaking the bell housing area of the transmission from using a solid transmission mount and solid motor mounts. The transmission must be able to flex to prevent the transmission from breaking. I have seen the pictures of the transmission flexing when under power. I found that using the old Pro Stock idea of using a torque chain and using rubber mounts stopped the vibration, the harmonics and other problems created from using solid motor mounts or urethane mounts.
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