I was in the junkyard today and I found what I believe (after studying the car) an 85 IROC. It had a 10-bolt with disc brakes. should I get this rearend? It had TPI and there was no G92 RPO listed. What carrier could it be? What would the stock gear be?

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I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28 350w/ edelbrock performer RPM power package , dynomax shorty headers, 700R-4 with shift kit, 750cfm carb, edelbrock 3" exhaust system, ASCD SS hood, 16" IROC rims.

future mods:
completely done over suspension, black paint with flames, Hurst shifter, dakota digital gauge package, procharger supercharger.

 

It sounds like the rear I bought! I can't remember what year it was now 84 or 85 but, it was a 10 disc and came from a z28. it had the posi 3.23 gears and also had the metric lines. so I lucked out. but, was told the 82-83 have sae lines. hope this helps.

 

Sounds like you've found exactly what I'm looking for!

My local thirdgen salvage yard is telling me that the 10 bolt disc rears aren't all that common compared to the 9-bolt.

I want a 10 bolt disc dammit!

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Working on:
'84 Z28 LG4 305 with 200,000 original miles!
Added dual elec fans.
145 MPH IROC Speedo
Building 430 HP 350 (ZZ430)
using primarily GMPP parts.
Short block sitting on a stand. (Man, those Fast-Burn heads sitting on it look good!)

Starting to look like the Kicker poster child!

ASE Certified Master Tech

 

if I get it and build it with all the strongest stuff I can find do you think it could take 420+hp?

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I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28 350w/ edelbrock performer RPM power package , dynomax shorty headers, 700R-4 with shift kit, 750cfm carb, edelbrock 3" exhaust system, ASCD SS hood, 16" IROC rims.

future mods:
completely done over suspension, black paint with flames, Hurst shifter, dakota digital gauge package, procharger supercharger.

 

oh yeah and they want $150 for it should I buy it?

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I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28 350w/ edelbrock performer RPM power package , dynomax shorty headers, 700R-4 with shift kit, 750cfm carb, edelbrock 3" exhaust system, ASCD SS hood, 16" IROC rims.

future mods:
completely done over suspension, black paint with flames, Hurst shifter, dakota digital gauge package, procharger supercharger.

 

I found an 86 like that. I didn't care what was in it since I was going to change everything anyway. I just wanted the housing with the disk brakes. It replaced the factory 9 bolt with disk brakes that was in my car.

Since then I've built it up with 4.10 gears, 28 spline axles, LPW rear cover, welded tubes etc. Only 6 hard passes on the diff so far and it's still holding up.

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Follow my racing progress on Stephen's racing page
and check out the race car

87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.69
Best MPH on a time slip: 121.52 altitude corrected to 127.76
Altitude corrected rear wheel HP based on power to weight ratio: 504.5
Best 60 foot: 1.546

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

does it still feel ok? Is it making any sounds? I have only 100 miles on the 9-bolt in my Z(it was installed before I got the car) and it is not taking the power of my engine. I don't know the history of the rear or how it was treated but I haven't done much to beat on it and it isn't liking it.

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I WOULD RATHER PUSH A CAMARO THAN DRIVE AN IMPORT

1983Z28 350w/ edelbrock performer RPM power package , dynomax shorty headers, 700R-4 with shift kit, 750cfm carb, edelbrock 3" exhaust system, ASCD SS hood, 16" IROC rims.

future mods:
completely done over suspension, black paint with flames, Hurst shifter, dakota digital gauge package, procharger supercharger.

 

150 is what I payed they are a bit weaker than the 9 bolt but, the parts are cheeper for them.

they are harder to find but, that doesn't make them worth much.