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

 

I have heard of this problem before...

I believe what most of the people i have talked to have done is to shim the trans crossmember to lower the angle...

1/8" or so is what you need to shim to get the angle back to proper alignment...

hope that helps,
Chris

 

I installed an Energy Suspension trans mount 2 weeks ago which fixed my clunking under hard acceleration,but now my Y-pipe is vibrating against the floor pan.I never thought about shimming it.I'll try it.

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We need Perry Mason

 

Im having similar problems with my car and its really starting to get annoying, but the humming and vibrations start at about 75-80 in my car. I wish I could find the cure for this!!!!....someone told be it might be my rear end gears may not be set up perfectly, but I doubt thats the problem. Someone please help. Thanks

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88 IROC-Z 305 TPI 5 speed
Performance Resource Chip, Flowmaster American Thunder cat back exhaust, B&M Ripper shifter, MSD coil, TB bypass, TPIS MAT relocation kit , TPIS 170* t-stat, Richmond 3.73 gears, March Power & Amp pullies, Home made Ram Air, Steve Spohn SFC's, LCA's , Panhard bar, TPIS AFPR, Ported plenum by Daniel Burk, Gutted cat
Best et: 14.232
Best mph: 97.76
Best 60': 2.063
http://hometown.aol.com/famioso15/johnnyiroc.html

 

Humming and vibrations at 75+ MPH is caused by an out-of-balance driveshaft. Either get your stock one balanced, or buy an aluminum driveshaft.

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West Coast GM Shootout 2001!
1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

I had the stock rubber one...it ripped in half, then a steel one...center bolt kept coming out...I am currently using the enregy suspension mount the center bolt hasn't come out but the two side bolts did so the only thing holding it in is the single crossmember bolt

 

You can get a 1LE mount from SLP or gmpartsdirect.com for under $20. It is much stronger than stock and won't vibrate like the poly mounts. I have a 1LE mount in both of my cars and have yet to break one.

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87 Formula 350 13.94@96.67
98 Z28 1LE 13.15@107.59
1LE Owners Association