I'm getting a SLP take-off Torsen and will need a pair of 28 spline axles. I have the older (1985) rear disk brakes. Are all 3rd gen 28 spline axles the same for the 10-bolt, or are they different for drum and disk rear ends? My rear brakes would be different from the 89-92 brakes anyway. When I priced axles at the GM dealer, I was asked if they were disk or drum and they told me for disk brakes left and right axles were different. Huh? The 26 spline axles I've taken out are both the same. Any help would be appreciated.

------------------
1985 Yellow IROC-Z 5.0 HO, T-5 3.73 Posi, 4 wheel disks
PFCM pads, GTA wheels, Koni yellows, B&M Ripper, Dynomax

 

They are all the same. Drum and disk. Left and right. You can pick up some good aftermarket 28 spline axles from www.drivetraindirect.com for $125 each. Part number KAC7-A7. They'll work in all 82-92 third gen 10 bolt diffs with a 28 spline carrier. Mine are in a '86 housing and '96 carrier.

Although I haven't pulled my old diff apart yet, I've heard that a 9 bolt has a left and right axle but I can't confirm that yet.

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

87 IROC-Z Pro ET Bracket Race Car
383 stroker (carbed) with double hump cast iron heads and pump gas
461 Big Block installed and ready for the 2001 racing season

Best results before the 383 blew up
Best ET on a time slip: 11.857 altitude corrected to 11.163
Best MPH on a time slip: 117.87 altitude corrected to 126.10
Altitude corrected rear wheel HP based on power to weight ratio: 476.5
Best 60 foot: 1.662

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

 

I had an 82 z28 that had disk brakes, the left axle got bent and i tied to take the left axle out of a drum brake set up and the axles were different. The length was the same but the hub where the studs are was larger on the drum brakes than the disk brakes.

------------------
82 cross-fire, 410 gears
700r4

 

Gerald, do you mean the diameter of the part that the hole in the center of the rotor or brake drum locates on?

------------------
1985 Yellow IROC-Z 5.0 HO, T-5 3.73 Posi, 4 wheel disks
PFCM pads, GTA wheels, Koni yellows, B&M Ripper, Dynomax

 

I have an 83 Z-28 and did the same thing. I got 3.73's and an Auburn Posi unit. I found out that the posi needed 28 spline axles. 1988 and up use 28's so I called several salvage yards and got a whole rear end out of a 92 RS with parking brake cables for $90.00. I then took the rearend to the guy that would put the gears in and had him to sandblast and paint it black. He also welded the axle tubes all the way around for more strenth.

When I started putting the rearend in I found that the brake lines were a little different so I took the old ones and the new ones to a place that can put reverse flare fittings on the ends. That was about $10.00.
I tried to just get 28 spline axles, too but couldn't find any unless I spent big bucks for aftermarket ones. Also a newer rear probably has fewer miles on it so the bearings will be fresher.

 

OLDYELLR, I'm talking about the part of the axle the the rotor fits on. I tried to put the rotor on but the in side if the rotor would not fit. I could not get the rotor on so i did not check to see if the center hole was the correct size. ------------------
82 cross-fire, 410 gears
700r4

[This message has been edited by Gerald Jackson (edited March 01, 2001).]

 

the axles for the disk brake rearend have a smaller diameter hub where the wheels studs are if drum brake axles are used the hub will be a little big for the brake setup, a friend tried the swap due to a snapped axle and had the have the hub turned down a little bit... Hope this helps...

------------------
1985 Iroc-z Hoping for 11's on motor this year

http://www.hometown.aol.com/iroczguy

 

I second the need to turn down the OD of the axle flange to get the rotor to fit over it. That was a measurement step in the Baer brake instructions for those converting from drum to disk. Some axles need machining, some don't. Just have to measure.

------------------
KevinP92Z
92 Z28 383 SLP cam,SLP headers,SLP 2ontheLeft,Trick Flow TW heads & pistons,Edelbrock base,Accel SuperRam,52mmTB,Scat Crank & forged ConnRods,MSD 6AL,SLP convertor,Baer 13/12" Track,Moser axles,Hotchkis,Genuine GM 3.42s,SLP HD Torsen,17x9" chrome SS rims
96T/A w/SLP Ram Air,SLP 2ontheLeft, Bilsteins, Baer, Hotchkis, Genuine GM, Torsen
76 4X4 Blazer 400TPI project