Someone replied to my earlier topic concerning the bad vibs I'm getting through my car at 60mph+ and stated that they had the same problem when they installed an Energy Suspension Trans mount b/c the mount is actually taller than the stock which effects the pinion angle. Anyone else with a similar experience? The car vibrates & hums violently at 60+. I've swapped u-joints, driveshafts, balanced tires, etc.

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'91 Z28 1LE; 355, Sportsman II heads, Edelbrock TPI w/ 58mm TB, Tremec TKO 5-speed, 3.73's & much, much more

 

Yes, the poly trans mount is physically taller than the rubber by about .25". Some people experience vibration some dont. Personally, I just went to the hardware store, bought some thick washers and put them between the crossmember and the frame, lowering the entire crossmember a little. That took care of it.


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Mike Metzler (Desert86Roc)[*] Webmaster: SpeedWorldMotorplex.com[*] Click Here For 86 IROC 305 TPI (406 build in progress) Page

ET's @ 1250 ft[*] 14.28 @ 95.461 mph (uncorrected, NOS, no headers)[*] 15.365 @ 86.785 mph (uncorrected, headers, no NOS)

 

I have the energy Suspension mount in mine and it works fine. Thinking that it will make a car vibrate by installing one sounds a little bogus, but who knows. With 3:73's, it sounds like you need an aluminum driveshaft!

-TA

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'82 TA "FRANKENBIRD" - built with various F-Body parts from '82 to '96.
CURRENT: '91 305, '96 T-56 6 speed, 3.42 POSI, '89 WS6, '86 TPI, SLP 1 3/4" headers
SOON: 350, Trick Flow TW heads, GM-HOT cam kit, PBR disc

 

Seems it's hit or miss. I installed the mount when I installed the Tremec so I'm thinking the pinion angle is out. Taller ES trans mount, crossmember adapter, etc.... As for the aluminum driveshaft, my car is a 1LE so I have it.