HELP!!!!!NEED INFO ON AXLES BY TOMORROW. PLEASE HELP!!!!!!!!!!!!!!!
Thread Starter
Registered User
Joined: Jun 2001
Posts: 65
From: HAMMOND
HELP!!!!!NEED INFO ON AXLES BY TOMORROW. PLEASE HELP!!!!!!!!!!!!!!!
OK I HAVE AN 87 IROC WITH THE 26 SPLINE AXLES, WELL I GOT A GOOD DEAL ON A POSI UNIT AND ITS A 28 SPLINE SO I FIGURE HEY HOW HARD CAN IT BE TO FIND 28 SPLINE AXLES RIGHT?WRONG I WENT TO THE BONE YARD AND COULD ONLY FIND 26.NOW I HEARD THAT THEY CHANGED THE AXLES TO ALL 28 SPLINE STARTING IN 88 BUT I GUESS THATS NOT TRUE CAUSE THE AXLES I GOT FROM THE JUNK YARD I MISSCOUNTED THE TEETH AND ITS 26 OUT OF A 89 RS.SO PLEASE TELL ME IF ONLY CERTAIN CARS HAD 28 SPLINE OR ONLY CERTAIN YEARS.PLEASE HELP I NEED TO KNOW BY TOMORROW CAUSE IM SUPPOSE TO GET IT ALL INSTALLED TOMORROW.
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1987 IROC-Z28
355 TPI
58MM HOLLEY TB
HOME PORTED PLENUM
LT1 INJECTORS
HEDMAN HEADERS
CRANE AFPR
MSD WIRES
JET FAN SWITCH.
STILL TO COME,
3:73 POSI DISK REAR
4' COWL HOOD
4TH GEN INTERIOR
ALL AROUND SUSPENSION KIT
------------------
1987 IROC-Z28
355 TPI
58MM HOLLEY TB
HOME PORTED PLENUM
LT1 INJECTORS
HEDMAN HEADERS
CRANE AFPR
MSD WIRES
JET FAN SWITCH.
STILL TO COME,
3:73 POSI DISK REAR
4' COWL HOOD
4TH GEN INTERIOR
ALL AROUND SUSPENSION KIT
Registered User
Joined: Aug 2001
Posts: 229
From: Fort Mill, SC
I sense a panic here. '88 was the cross over year, but some say it was '89. Do you have a 9 or a 10 bolt rear now? All 9 bolts have 27 splines...period. Since you have an '87, I would think you'd have a 9. If you've got the 10 bolt, look for a '90 on up rear. These will definitely have the 28s that you need.
This help?
Ed
This help?
Ed
Thread Starter
Registered User
Joined: Jun 2001
Posts: 65
From: HAMMOND
<font face="Verdana, Arial" size="2">Originally posted by ebmiller88:
I sense a panic here. '88 was the cross over year, but some say it was '89. Do you have a 9 or a 10 bolt rear now? All 9 bolts have 27 splines...period. Since you have an '87, I would think you'd have a 9. If you've got the 10 bolt, look for a '90 on up rear. These will definitely have the 28s that you need.
This help?
Ed</font>
I sense a panic here. '88 was the cross over year, but some say it was '89. Do you have a 9 or a 10 bolt rear now? All 9 bolts have 27 splines...period. Since you have an '87, I would think you'd have a 9. If you've got the 10 bolt, look for a '90 on up rear. These will definitely have the 28s that you need.
This help?
Ed</font>
------------------
1987 IROC-Z28
355 TPI
58MM HOLLEY TB
HOME PORTED PLENUM
LT1 INJECTORS
HEDMAN HEADERS
CRANE AFPR
MSD WIRES
JET FAN SWITCH.
STILL TO COME,
3:73 POSI DISK REAR
4' COWL HOOD
4TH GEN INTERIOR
ALL AROUND SUSPENSION KIT
Registered User
Joined: Mar 2000
Posts: 2,037
From: 51°N 114°W, 3500' elevation
Are you sure about your differential? The 87 IROC's came with 3.27 geared 9 bolts. It will have 9 bolts and a rubber fill plug on the cover.
9 bolt and 10 bolt axles are not interchangable.
If you do have a 10 bolt then either find a 90-92 third gen (good luck, production numbers were low for those years) or you can buy better aftermarket 28 spline axles from www.tomsdifferentials.com for $125 each.
------------------
Stephen's racing page
or check out the race car
87 IROC SuperPro race car
461 big block
Best ET on a time slip: 11.603
Best MPH on a time slip: 115.91
Best corrected ET: 11.138
Best corrected MPH: 121.85
Altitude corrected rear wheel HP: 450
Best 60 foot: 1.671
Member of the Calgary Drag Racing Association
9 bolt and 10 bolt axles are not interchangable.
If you do have a 10 bolt then either find a 90-92 third gen (good luck, production numbers were low for those years) or you can buy better aftermarket 28 spline axles from www.tomsdifferentials.com for $125 each.
------------------
Stephen's racing page
or check out the race car
87 IROC SuperPro race car
461 big block
Best ET on a time slip: 11.603
Best MPH on a time slip: 115.91
Best corrected ET: 11.138
Best corrected MPH: 121.85
Altitude corrected rear wheel HP: 450
Best 60 foot: 1.671
Member of the Calgary Drag Racing Association
Registered User
Joined: Feb 2000
Posts: 825
From: Stamford, VT
Your Caps Lock key seems to be stuck.
Anyway, you can always buy new 28 spline axles from Moser Engineering. They are somewhere around $200. I'd have to dig out the receipt to be totally sure.
------------------
The IROC Homepage
View the Restoration of an 85 IROC
Weekend projects aren't.
Anyway, you can always buy new 28 spline axles from Moser Engineering. They are somewhere around $200. I'd have to dig out the receipt to be totally sure.
------------------
The IROC Homepage
View the Restoration of an 85 IROC
Weekend projects aren't.
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