Josh 91RS

Swapping in a new engine, and im trying to figure out what kind of rear end will hold up to over 400 hp and torque? How much will it cost me, and how much is installation typically? Looking for something probably with 3:43-3:73 gears

Biochem

A 9-bolt will, but you'd might want to rebuild a 10-bolt with some extras to be positive. Obviously a 12-bolt and 9" will...

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1984 z28 w/ a 357 cu in. monster engine which is looking like the posterchild for Edelbrock with the exception of the Holley 750vac... all the suspension stuff... 9-bolt posi disk is in...

-=ICON Motorsports=-

Josh 91RS

What does a stock 91RS come with? Just curious since i dont know what i currently have.

ede

josh you have the 7.5" 10 bolt. there are a lot of people on here that have had them hold up and last behind strong engines. my son has one in his camaro and it's held up to his abuse so far. his only big problem has been pulling the threads out of the trans where the mount bolts up.

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ICON Motorsports

1st & 3rd

Josh 91RS

I only need it to last until i can afford a new rear and tranny. Im going to try to be really easy on it untill i have more money...but im just wondering if an occasional stoplight race is gonna blow the rear end.

Josh 91RS

So would something like a 10 bolt, 8.5" 30 spline limited slip differential be considered "beefing up" a 10 bolt? Or do i have to change the whole rear end out? Theres also a borg & warner 3.08 rear end from an 85 trans am for sale, would that be better then what i have or no? (Besides the gears i mean)

JETHROIROC

The BW is stronger than the Camaro/Firebird 10-bolt, although maybe not an 8.5" 10-bolt rearend such as from a truck. I've heard there aren't many gear options for the BW rear, though.

406 S10 Man

iTrader: (1)

it will be fine. i beat the hell out of mine whenever possible and it is fine. i have raced with slicks several times and done many donuts on dry parking lots, so don't worry about it. just fix it when it breaks.

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88 S10
Dropped 3/4
18" Boyd Coddington Timeless 5s
Dart equipped 406
12.20 @ 115.25 mph

Ace_Murdock

I would stongly recommend a 12-bolt or a 9". you could probably pick one up from a junkyard, then weld brackets on to make it fit into the car.

GOLD85

dont 90 and up RS have 28 spline axels.

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when the green flag drops the bull$hit stops

Curent: 350,performer RPM intake ,650dp, 700r4, headers, 3inch exhast
Spring 01: 406, Comp 282 solid cam, 2400 stall converter, every thing else the same.

R.I.P #3

Dan87IROC-Z

I would just go ahead and spend the money and get a soild 8.8" 12 bolt. That way there are no worried what so ever.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission
Borg Warner 7.75" 9 Bolt Rear End

Current Mods: LT4 Hot Cam, Comp Cams 1.52:1 Roller Rocker Arms, Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET (w/o LT4 cam): 14.32 @ 97.7mph
(corrected for elevation)

7.5" 10 Bolt with 3.42s soon to come!

Ward

iTrader: (1)

Well a 7.5" will hold up to a fair amount as long as you have street tires, becuase you will lose alot of power in wheelspin. But with slicks, well im pretty sure 425HP would break something...

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1983 Pontiac Firebird SE
LG4-Based Chevy 400
700R4 Tansmission
Modified 4 Barrel Q-Jet Carb
Accel Super Stock 8mm Wires
Edelbrock Pro-Flo Air Cleaner
3.23 Posi Rear
14X7" Cragar SS/T Wheels
Clarion 45X4 CD/AM/FM Head Unit
100WX2 Amp
2 Pioneer 12" Subs in Custom Box
Third Gen Performance
"A four cylinder is only half an engine"

LottaBallsCamaro

A dana 44 would handle it easily... I cant remember if it was the 3rd or 4th gens but I seem to remember them coming with one for some special model or something.

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Pretty damn smart with cars for 17!
91 Camaro RS, 305 TBI
92 Lumina, 275,000mi and humping!
No mods yet...Hopefully:
Convert to dual-cat with headers and Borla catback exhaust.
350hp 305TBI I dont care what you say!!!!
RAM air hood & Z28 wing.
ABS system.
Positraction rearend with rear disc brakes.
Rebuilt front and rearend suspension with polygraphite bushings.
Strutbrace.
Rollbar.
Subframe connecters.

JP84Z430HP

I remember the Dana 44 being available as a bolt-in for thirdgens (fourth-gens bolt in the same, but a like an inch or 2 longer.)

I would like to get my hands on one of them! If I remember correctly, they weren't all that expensive either!

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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.

Starting to look like the Kicker poster child!

ASE Certified Master Tech