teal94z281989

also how do i kno what series i have? im guessing 2 series?

draggin97s10

iTrader: (2)

i have to agree to disagree with the installer being the problem with aftermarket gears whining! I was a tech for about 4 years...certified in gears....Not that, that means ****, But i have noticed with cheap aftermarket gears are more likely to whine and that gm gears are quieter. Just my two cents. Set up several sets and have destroyed several sets.

draggin97s10

iTrader: (2)

Not to mention MOST aftermarket sets are factory rejects

ramair 1

iTrader: (2)

I agree draggin on the aftermarket sets ,but allot of the time it is the installer or DIY that is the issue.O.P. find out if you car came with and that will tell you if it came with a 3.23 is a series 3 carrier if its a 273 then series 2

teal94z281989

i bielive my rearend came with 3.42 from factory. its a 94 z28

Gmanstan

Go with the 4:10's they'll last if you dont abuse too much & you'll get to use 6th gear. I have them in my DD ,and perfect for street/freeway,at 80-85mph I average 26 mpg+ on long drives ,before the gears I couldnt even get to 6th gear without luggin' the motor.

Rob94hawk

iTrader: (1)

Anyone know why this Motive 3.90 ring and pinion set is $400 and the rest are half this?

http://www.summitracing.com/parts/mgr-g975390

bowtienut

iTrader: (1)

"cheap aftermarket" - I'd say you just may have a point there
Someone above mentioned Richmonds being loud. I don't consider Richmond cheap aftermarket, have plenty of experience with them, and every set has been quiet.

SS RRR

iTrader: (2)

I've always seen complaints about those who use Richmonds having noise problems. I've just always thought they were a more finicky gear to set up. Seems everyone who's had a good installer has always been happy with Motive gears. It's what I have in my 12-bolt now and it's quiet as stock.... until the harmonics kick in and it gets transferred through the body from the chassis mount torque arm.
Not sure how often you go to the track, but if you don't then spend the money on the 10-bolt as suggested and don't worry about a heavier duty diff. If you do go to the track then I wouldn't spend a dime on what you have now and save.

guppymech

iTrader: (7)

Speedinc wants $190 for that same gearset and that has been their price for the last couple years.

jesup16

iTrader: (1)

I've had richmond's and now have motive's. Installed by 2 different experienced mechanics...both are noisy.

I'd recommend GM parts if you can find/afford them.

Fool me once, shame on you. Fool me twice, shame on me!

draggin97s10

iTrader: (2)

I have installed two sets of richmonds and they have been quiet as could be...

teal94z281989

i dont go to the track at all yet but like i said i wont abuse them since i hear to many horror stories about them shattering. im just gonna get the 4.10s, ta girdle and master install kit that should last me awhile as long as i dont pop the clucth.... whats the break in process for these puppys???

nitrous2fast

iTrader: (2)

Dont forget the solid pinion spacer. It will keep the torque from pulling/pushing the pinion too far.

teal94z281989

ok where can i find a solid pinion spacer?

nitrous2fast

iTrader: (2)

http://www.summitracing.com/parts/rat-4111/overview/

or

http://texas-speed.com/p-2449-ratech...5-10-bolt.aspx

teal94z281989

thanks everyone for the help. I greatly appreciate it