I'm still experiencing major vibs at speeds of 60mph & up. I've replace all u-joints and have tried 2 driveshafts...1 steel & stock 1LE aluminum. It's still there. Pinion bearing feels tight too. The vib feels like a bad u-joint but obviously isn't. An obvious question would be tire balancing but I had them rebalanced and it's still there. I've also jacked up the car and put it in gear looking for obvious wobbling of the tires from a bent axle and checked the rear alignment and everything looks good. I've called around about putting it on a dyno to check it out under load but no one wants to touch it b/c of safety issues! I'm at my wits end here! Any ideas, suggestions, or similar experiences?

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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

 

You say the tires are balanced. Were they static balanced or the old way of rotating balanced?
Sometimes if they are static balanced , the possible broken bands in the tires would be junk?
I've had that happen before. Real pain in the butt. Its not real obvious but sometimes happens.

Brendan

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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

To see the ROC, Check out the webpage Here

 

ok i just read my post, i didn't make much sense.
If the wheels/tires were staticly balanced it may be possbile that the broken bands in the tires went undetected.

 

Heh, I knew what you meant. I had them balanced both ways and it didn't change anything. The vibs are way to excessive for it to be an out of balance tire though.....

 

Ed, i'm stumped. Sorry i couldn't help.
Goodluck

Later,

Brendan

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1987 IROC-Z L98,SuperRam,EB 6085's,LPE 219/219 Roller, Crane 1.6RR, EB TPI Base, 58mm TB, ADS 24#, AFPR, K&N, EB TES, Catco Cat, 3" Borla Cat-Back, Accel cap,rotor,distro/other crap, MSD 6AL, MSD Blaster 3, Aluminum DS, 94 Disk Rear, Adjustable Valve, Precision 3.73 Gears, Sub-Frame Connectors, Hotchkis Lower Control Arms, KYB Shocks/Struts, Suspension Techniques Lowering Springs, Polyurethan Bushings all over the place, Moog Upper/Lower Ball joints and Tie Rods ends/Idler Arm,

To see the ROC, Check out the webpage Here

 

I just went through the same type of thing. I was a jack @ss though. I forgot to put the clips in the rear u-joint, thing vibrated madly above 80mph.

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1986 CAMARO Z28 ->
151,000 original miles, 43,000 on 89' vette 350 block, Holley 650 DP, Weiand intake, 1.6 rockers, 1 5/8" headers, no cat, 2 1/2" Flowmaster catback, Mallory coil, March pulleys, B&M Ripper shifter, T5 with 3.35 1st gear and 0 miles, 90% Centerforce clutch, 3.73 posi, Eibach 1" drop springs, Spohn LCA's, Spohn adjustable panhard rod, Subframe connectors, all bushings are urethane, 2 12" Sound Streams, 2 Infinity 6X9's, 2 Pioneer 6X9's, 800 watt Lanzar Vibe amp. ET 13.22@ 106.4MPH 3300lbs less driver and speakers Next mods-> Extreme Energy 268 cam, Holley street dom intake.

1987 TRANS AM ->
73,000 miles, 305TPI, auto, gutted air box.

 

Ed,
See my reply to your previous email
As you can see there is nothing i havent replaced abd i still got the same vibration