How do I tell if I have a 3.27 or 2.77 rear end?
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Junior Member
Joined: Nov 1999
Posts: 79
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From: Monroe,LA,
How do I tell if I have a 3.27 or 2.77 rear end?
I have thought this whole time I had the 3.27 rear end, because of it being an 87 IROC. I read somewhere that all 87 5.7 IROCS had the 3.27 rear end. Am I wrong, if I am how can I tell what I have? my RPO codes are gone, so I can't check them 
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87'IROC-Z 350 TPI
Ported Plenum,Hypertech Air Foil,Ram Air kit,SLP headers,AFPR,80series flowmaster and MAF screens removed.
14.61@94mph(90+ degree weather)
[This message has been edited by southerniroc (edited September 15, 2000).]
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87'IROC-Z 350 TPI
Ported Plenum,Hypertech Air Foil,Ram Air kit,SLP headers,AFPR,80series flowmaster and MAF screens removed.
14.61@94mph(90+ degree weather)
[This message has been edited by southerniroc (edited September 15, 2000).]
Senior Member
iTrader: (4)
Joined: Aug 1999
Posts: 629
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From: previously OKINAWA JAPAN,georgia, now new england
Car: 1989 IROC--1989 T/A
Engine: 5.7 TPI in both
Transmission: W/C T-5 in both
Axle/Gears: B/W 3.27 in both
on another site there is a table that confirm all 1987 IROCS W/ L98 5.7, auto, came with 3.27
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'89 SHAGGY IROC
L98 7r4, all free stuff,T.E.S.,HOOKER CAT BACK,KYB,ACCEL8.8,JET fan sw. etc.
so much to do , so little money
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'89 SHAGGY IROC
L98 7r4, all free stuff,T.E.S.,HOOKER CAT BACK,KYB,ACCEL8.8,JET fan sw. etc.
so much to do , so little money
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