OK, in my quest to find a 4th gen rear, I came across a guy who has 2 3rd gen IROCs (Both with discs out back). Now, if I wanted to put one of those onto my 87 Z (Complete from disc to disc), would it be a straight bolt on (Except for the proportioning valve and master cylinder)?

4th gen rears are hard to find around here, so when I stumbled onto the IROC one's I thought I'd take a look. The guy is going to count the teeth this weekend and get back to me (With price too). What do you guys think (Right now I have 2.73's)?

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Trevor
87 Z28 - LG4 - 305
Hedman Headers, Y-Pipe, Dynomax Exhaust, K&N Open Air Filter

http://immortaltk.tripod.com/z.html

 

That swap would be ok for a 3:23 rear, the disc will be allright. If you can wait, I would look for a 89 or later rear. These have
a very improved disc system(11.655 rotors and two piston Alum PBR calipers) Axle ratios
are limited with the most common being 2:73&3:23 ten bolt and 2:77&3:27 nine bolt with both having Possi. No big problem installing. Just something to think about and
good luck.

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1987 Black Camaro IROC-Z (original owner) Replaced LB9 @ 86100 miles.
New 350 Crate engine
Balanced & blueprinted
World Prod SR 67cc Heads 9.6:1 C.R.
Cam: 454lift,216dur@50,110ls
TPI Induction(from 305)
22# Fuel Injectors
AFPR & Gauge
SLP Intake runners
Fastchip stage 2 chip
K&N filters & Air Foil
Hothkis STB
SLP 1 3/4 Headers
CATCO 3" Catalytic conv.
SLP 3" Cat Back Exhaust
700R4 Auto
SLP Torque Converter (2400 stall)
1LE Aluminum Dr Shaft
B-W 9 bolt rear 2:77 Possi. Four wheel disc brakes,245/45/ZR-17 Tires
17x8.5 ATI 5 Razze Wheels
Dyno results: 211 RWHP & 282 RWTQ.
271 HP & 362#/ft at flywheel with all Emission controls installed. New Toy!

 

Hopefully the guy will get back to me, and let me know the condition/year/gearing/price for the IROC rear end's.

So with the most common being 3.2x ratios, would it be a worthwhile upgrade from 2.73? or should I hold out for 3.42 (Or 4th gen)?

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Trevor
87 Z28 - LG4 - 305
Hedman Headers, Y-Pipe, Dynomax Exhaust, K&N Open Air Filter

http://immortaltk.tripod.com/z.html

 

TK
It depends on what you want, Brakes or Gears.
When I had to change my rear (possi shot) I thought Wow! Disc's and gears. However: these things are getting rare, so take your pick(2:77's are not that bad). Fourth Gen
rears I don't know, for one they are 4" wider
and your wheels will not fit. Your choice.
3:42's are the rarest!

[This message has been edited by Z28DJP1987 (edited September 28, 2001).]

 

I want gears, but at the price I was quoted (400-500 Canadian) installed, I figure getting another rear would be better (Since I can install that myself too). The big brakes/posi is just a bonus,at least that's the way I'm looking at it...

Of course, I'm kind of ignoring the fact that the rear I get could need rebuilding too....

------------------
Trevor
87 Z28 - LG4 - 305
Hedman Headers, Y-Pipe, Dynomax Exhaust, K&N Open Air Filter

http://immortaltk.tripod.com/z.html