Alright it started today for the first time. When I take of from med acceleration or harder I hear a lound knock from the back right tire, usually 2 knocks actually, andwhen it happends I can feel it too. It just started all of the sudden today. It does not occur under light acceleration or under rolling hard acceleration, drivability is fine, but this sound has me woried. It is maybe a loose part or something maybe?
HAven't got a chance to jack her up, but from a quick look I se no obvious breakages.

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Flowmaster,Edelbrock open filliment filter with K&N filter in it
160 stat, BF G-Force w-rated tires

 

If all else fails, take it to a suspension shop.

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Year: 1990
Make: Chevorlet
Model: Z-28 / IROC-Z
Engine: 5.0L V8 TPI
Trans: 700R4 Auto
Additional:'92 Z-28 Rims, T-Tops, Tinted Windows, Edelbrock Suspension Kit, Edelbrock Catback Exhaust (Chrome tips), K&N Air Filter

 

WHEEL BEARING GOIN BAD ON YOU?

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1989 IROC-Z
350c.i. TPI
rebuilt 700R4 with shift kit
3'' Monza Pacesetter cat back exhaust (minus the muffler)[SOUNDS OF THIS ON MY WEBPAGE]
new dual cats
3.23 Posi rear
hypertech chip
under drive pulleys
adjustable fuel pressure regulator
K&N Air Filters
Excalibur alarm, keyless entry and remote start
new:
struts, shocks, bearings, distributor, cap, rotor, alternator, battery, regulator
245 ZR16 50 Tires, Rotors and brake pads all the way around

Go to my webpage to find out more about it.
You can also see pictures, and hear sounds as well.
http://go.to/iroc-z

AOL IMer: JRShotliff

 

Sounds to me like you have a bushing that's shot. When you jump off the line, or give it good acceleration, the bushing will give way and you'll get a a metal-to-metal bang.

I would check the rear bushings before taking it to a shop.

Thomas.

 

After giving her a better inspection I found that it is the trans mount bushing that went.
whew, easy fix at least.

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Flowmaster,Edelbrock open filliment filter with K&N filter in it
160 stat, BF G-Force w-rated tires