I picked up the Z28 from the shop the other day (had a new starter put in) and the guy who did the work said he noticed my differentials were getting pretty loud. He had a firebird a few months ago but had to sell it before starting law school. Well either way he said that the same thing happened to his car and he ended up having to get a new set. Since he's a mechanic he got a deal on the set for about $1200 and had a friend do the work for about $200. Does that sound right? I do have a loud interior noise and it's not the exhaust. It sounds like gears rotating, like if i'm inside the transmission or something like that. The rotating noise is coming from beneath my back seats and gets louder with my speed and lower when i go slower.
Is this a problem i should be worried about or is this guy just jumping the gun to try to juice me for money?

------------------
~Wilson........
Smoked out Black 93 Z28
EGA behind passenger window...
Sleeping Midnight Blue 89 GSX-R 750

 

Um, well the differential doesn't cost anywhere NEAR $1200...the gears usually run like $420 I think for GM Motive gears. He's full of **** about the price...not sure about the noise, could be the differential.

 

Hopefully he's referring to a whole rearend for $1200, not just the diff...

 

GM Motive gears are roughtly $170-$200
and a really good Eaton posi runs ~$400 Labor would be about $250 to install them both.

For $1200 you could replace every part in the rearend and then some.

------------------
Jason
93 TA, M6

 

That's what i was thinking also.......i did think that was a bit excessive, but wasn't sure.

So should i look into getting an aluminum driveshaft and new gears?

------------------
~Wilson........
Smoked out Black 93 Z28
EGA behind passenger window...
Sleeping Midnight Blue 89 GSX-R 750

 

$1200

aren't 12 bolt rear ends like $1270?

if you got the money do it but if you wanna go the really cheap route I got a used lt1 rear axle for $408 shipped to Orlando. included brakes, and brake lines for direct bolt in.

------------------
1994 Medium Quaser Blue Camaro 3.4L V6 w/ 5-speed
Homeade CAI with a huge K&N cylinder filter, Single outlet Flowmaster with resonator, Accel 8mm ignition wires, Rapidfire plugs, 3.42 gears and posi off a 97 WS6, 1 piece steel driveshaft, Converted to 4-wheel disc brakes, 1LE transmision mount, 1LE sway bars, Prothane bushings and endlinks, BMR Strut tower brace, ASP underdrive pulleys, 160* stat
Lightest Weight W/out driver: 3160
15.696@86.22 with a 2.214 60'!
Best R/T .507
Best 60' 2.078
Father's Stock 2000 Navy Blue Camaro 3.8L V6 w/ 5-speed
15.875@88.25 With wheel spin in 1st
15s are cool!
AIM: MustangEater82

 

Depending on the last time you had changed the rearend fluid ... you might change the rearend fluid and find the noise goes away. If you have a 6-speed also check/change the fluid level in there. Could also be a u-joint drying up and rumbling.

Later ... Larry S.

------------------
'95 Trans Am - Powerdyne
11.874 @ 118.92 MPH

 

For $1200 you could replace the entire rear including labor. He got ripped off if he was telling the truth. Not only that, if he is a mechanic why did he pay a friend to do the work???



------------------
John Peacock

96 Z28 Silver droptop
00 Mazda 626 V6 5sp (15.1 93.2mph)No Mods

 

That guy works at like a Mobil or something off University right? He borrowed tools from us in the junkyard one day, said he would give me a free oil change. He did, he is a relly nice guy but did seem to get screwed a lot on parts for his car. He said he paid like over $100 for a fuel filter.

 

Yea that's him, he's a cool guy no doubt, but like i said that sounded a little excessive. Oh well, i'll see what i do, hold out and save some money to see what's really the problem. Thanks for all the responses!


------------------
~Wilson........
Smoked out Black 93 Z28
EGA behind passenger window...
Sleeping Midnight Blue 89 GSX-R 750