Okay, I have yet to figure this out. At 60mph I get a horrible vibration that doesn't go away as speed progresses. I've checked pinion angle, driveshaft balance, wheel/tire balance, lift bar adjustments, u-joints, etc. & it's still exactly the same. Any suggestions or ideas before I take it to a frame shop? The car was in an accident over the winter before I bought it, I had a shop install a new front crossmember & control arms (guy hit a steel construction road plate) but vibration is coming through the rear (feels like a bad u-joint). Plus my new Lakewood lift bars are cracking at the axle mounting brackets! Maybe related, I don't know but I'm at my wits end here! Thanks!

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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

 

HI I had a problem sounds like it could be same & belive it or not just balancing the rear wheels cured it. could be worth a try for small bucks. ifit works let me know.

 

Bent axle? If you have a grinding sound with that vibration it might be a bearing.

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82 camaro--original steering wheel, brake/gas pedals, seats--everything else modified
82camaro

 

Ed, bring it by the house. We will get it figured out. jon

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"ofcourse this is safe!"

 

Yo, wassabi! I'll give you a ring, I was thinking maybe I could throw your 2 rear wheels on just to see if it's still there...mine are balanced but you never know...4-3/4" cowl hood came the other day!


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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

 

82 your sig is hillarious
oh and something to do with steel driveshafts above a certain speed also does it for ya,
im going new shaft and alignment.

gluck,
and 82, sure it is (pulls head back inside window)

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91 FireBird 305 V-8
no true mods,
ghetto rigged cold air intake,
"My G/f Once Wanted To Break Up Because Of Competition With The Car."
GheTTo Riggers INC.
We Make Mcgyver look Like Crap

 

Well, 82zm6 & I tore apart my rear this weekend hoping it was just bad wheel bearings but instead discovered a broken tooth on the ring gear. Definitely a vibration maker I'd think. Also discovered both mounting brackets on my Lakewood Lift bars were cracked....WTF is next!?!?

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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