Appears my recently purchased Z28 6spd 100k miles makes a vibrating noise from the rear at 90mph. I just bought new rubber all around so I would rull out the low tread indicator or rocks. No vibration under 90 mph, any ideas where to look first ? bearings ?

 

only vibes at 90+, how bad is it? maybe its just cuz your going fast as hell

 

Its pretty noticeable especially when I let off the gas at 90mph. Played cat & mouse with an 05-06 Audi S4 this morningand didn't notice any vibrating other than some Adrenalin vibrating though my body around 130mph

 

Ujoints or, more than likely, bad diff carrier bearings. If it's all origional with 100k on the clock, then it's time for all of it anyway.

 

Any recommendations on where to get replacement parts or upgraded performance replacement parts ? Front end is also making little noises over road bumps, perhaps the front end with 100k needs some replacing or upgrading.

 

change your shocks and struts before you do anything else.

 

I've got a '94 Z28 with that same exact problem. I'm lookin to get it fixed too. It's extremely annoying...How hard is it to change the diff carrier bearings and U-joints?

 

i have heard our 4th gens have some issues with driveshafts causing vibrations, i got that from a tranny guy that works at a Chevy dealer while i was taking my ASE recert. test . mine has a very slight vibration @ 90-110mph , my car has a steel driveshaft , so i'm going to upgrade to an aluminum driveshaft.