26 and 28 spline axles?
#1
Junior Member
Thread Starter
Join Date: Sep 2004
Location: midwest
Posts: 11
Likes: 0
Received 0 Likes
on
0 Posts
Car: 88 firebird formula
Engine: 5.0 TBI
Transmission: auto
differentials
Can anyone tell me what year is the cutoff between the 26 and 28 spline axles?Also, are the bearing diameters the same on the carriers, so that an older 26 spline axle can be upgraded to a 28 spline? what kind of problems am I going to encounter to accomplish this swap?
Thanks.....................................................................................
OLDRED88
Thanks.....................................................................................
OLDRED88
#2
Member
Join Date: Feb 2002
Location: Villa Park, IL
Posts: 497
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 Iroc z28
Re: differentials
Originally posted by oldred88
Can anyone tell me what year is the cutoff between the 26 and 28 spline axles?Also, are the bearing diameters the same on the carriers, so that an older 26 spline axle can be upgraded to a 28 spline? what kind of problems am I going to encounter to accomplish this swap?
Thanks.....................................................................................
OLDRED88
Can anyone tell me what year is the cutoff between the 26 and 28 spline axles?Also, are the bearing diameters the same on the carriers, so that an older 26 spline axle can be upgraded to a 28 spline? what kind of problems am I going to encounter to accomplish this swap?
Thanks.....................................................................................
OLDRED88
2. 28 spline axel can bet used in a 26 spline houseing as long as you have a 28 spline carier.
3. I just did a swap on my 86 saturday. I swap in 3.23 gears, an Slp take out posi, And 28 spline axel. I didn't encounter any problems. Make sure you cangte your axel seals while you have the axels out!!!
#3
Member
Join Date: Jan 2004
Posts: 104
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1989 Pontiac Trans Am GTA
Engine: 357 Tuned Port Injection
Transmission: Borg Warner T-5
Axle/Gears: BW 3.45 9-Bolt
9bolt rear ends came with 28 spline axles in 89 for the F-Bodies. Im not sure if that is the same for the 88 and older.
#4
Junior Member
Join Date: Jan 2006
Location: Texas
Posts: 71
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1986 Transam/1996 Trans AM
Engine: 5.7 LT1 .030 over
Transmission: Borg-Warner T-56 6 speed
Axle/Gears: 3.42
i HAVE A 10 BOLT 28 SLINE IN MY 86 Transam, It originally came with 3:42, non-posi, 305 with a 5-speed manual.
My gears started to hum so I had a 2000 rear end off of a wrecked Ram-Air, I couldn't use the axles since the rear end is 1 1/2 iches to 2 inches wider than my original axle, so I tried to keep the posi off of the Ram-Air (or limited slip) and put it in my original rear end and the unit bolted up with no problem but when I put my original axles from my 3rd gen into the 4th gen carrier it just turned in the carrier. Now I could be wrong, but I think that the splines on that 4th gen carrier were either 31 splines or i had a 26spline and the carrier was a 28spline. Anyways, any of the 3rd gen'rs out there want to know, I succesfully used just the Ring and Pinion gear off of a 4th gen to a 3rd gen carrier and it worked perfect. After shimming my rear end it works perfect, I still get to run my mid 12's without a problem.
just one more thing.....
The ring gear and the Traction control ring are one unit so I dont think this would work for a 9 bolt rear.
thanks,
Eric....
My gears started to hum so I had a 2000 rear end off of a wrecked Ram-Air, I couldn't use the axles since the rear end is 1 1/2 iches to 2 inches wider than my original axle, so I tried to keep the posi off of the Ram-Air (or limited slip) and put it in my original rear end and the unit bolted up with no problem but when I put my original axles from my 3rd gen into the 4th gen carrier it just turned in the carrier. Now I could be wrong, but I think that the splines on that 4th gen carrier were either 31 splines or i had a 26spline and the carrier was a 28spline. Anyways, any of the 3rd gen'rs out there want to know, I succesfully used just the Ring and Pinion gear off of a 4th gen to a 3rd gen carrier and it worked perfect. After shimming my rear end it works perfect, I still get to run my mid 12's without a problem.
just one more thing.....
The ring gear and the Traction control ring are one unit so I dont think this would work for a 9 bolt rear.
thanks,
Eric....
#5
Senior Member
Join Date: Aug 2004
Location: Upstate New York
Posts: 708
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1988 SC Camaro
Engine: 305 TBI
Transmission: 700-R4
hmm, i was under the impression that from 82-89, 26 Spline shafts were used, and from 90-92, 28 Splines were used...am i wrong? This is a common question that comes up and its still elusive to me.
#6
Supreme Member
Join Date: Jul 2003
Location: any clime or place...
Posts: 2,779
Likes: 0
Received 2 Likes
on
2 Posts
Car: 1987 Camaro SC, 1999 Z28
Engine: GMPP 350HO, LS1
Transmission: Built 700r4/EDGE 3200, T56
Axle/Gears: 3.42 Eaton 7.625, 3.42 Zexel Torsen
Originally Posted by Crusin' 1980's
hmm, i was under the impression that from 82-89, 26 Spline shafts were used, and from 90-92, 28 Splines were used...am i wrong? This is a common question that comes up and its still elusive to me.
Only way to indentify your parts is to either read up, or get dirty...
#7
Junior Member
Join Date: Jun 2007
Location: MN
Posts: 80
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1985 IROC-Z
Engine: 305 H.O.
Transmission: 5 Speed
Axle/Gears: 7.5" 10 bolt, 4.10, torsen posi
Re: 26 and 28 spline axles?
Here are the hollinder part numbers for third gen axles
447-1301 82-87 F-body w/disc brakes 10 bold cover GM22515440 26 spline 30 5/16" long
447-1302 82-89 F-body w/drum brakes 10 bolt cover GM22515441 26 spline 30 5/16" long
447-1407R 87-90 Camaro, 85-91 Firebird w/disc brakes 9 bolt cover 28 spline
447-1605L 87-90 Camaro, 85-91 Firebird w/disc brakes 9 bolt cover 28 spline
447-1776 90-92 F-body w/disc brakes 10 bolt cover GM26034018 28 spline 30 5/16" long
447-1777 90-92 F-body w/drum brakes 10 bolt cover GM26031251 28 spline 30 5/16" long
The spicer numbers for the Dana 44 - bill of material number 605218-1, -2, & -3 (listed in the Spicer book as a 1984-85 F-Car)
72384-1X 29.54" long 1.31" x 30 spline
72384-2X 30.50" long 1.31" x 30 spline
447-1301 82-87 F-body w/disc brakes 10 bold cover GM22515440 26 spline 30 5/16" long
447-1302 82-89 F-body w/drum brakes 10 bolt cover GM22515441 26 spline 30 5/16" long
447-1407R 87-90 Camaro, 85-91 Firebird w/disc brakes 9 bolt cover 28 spline
447-1605L 87-90 Camaro, 85-91 Firebird w/disc brakes 9 bolt cover 28 spline
447-1776 90-92 F-body w/disc brakes 10 bolt cover GM26034018 28 spline 30 5/16" long
447-1777 90-92 F-body w/drum brakes 10 bolt cover GM26031251 28 spline 30 5/16" long
The spicer numbers for the Dana 44 - bill of material number 605218-1, -2, & -3 (listed in the Spicer book as a 1984-85 F-Car)
72384-1X 29.54" long 1.31" x 30 spline
72384-2X 30.50" long 1.31" x 30 spline
Last edited by iroc_zz; 06-25-2008 at 03:23 PM.
Trending Topics
#11
Re: 26 and 28 spline axles?
I know this thread is old, but the search doesn't pull up exactly what I'm wondering; hopefully someone can help me understand. I'm helping my son build his car, its a 90 RS with 305 TBI. We're wanting to switch it to dics in the rear, so I looked at the 4th gen rear end route and then went to Hawks and saw that they sell basically every rear end setup there, 3rd and 4th gen. I see that the 89 would be $550 and a 90 would be $1000, what am I missing? When I searched part numbers for u-joints an 89 and a 90 are the same part number, couldn't I just buy the $550 with disc brakes change out the u-joint and go back together with the 26 spline from an 89? Or is it easier/cheaper to do it different? Or am I just completely thinking about this wrong?
#12
Member
iTrader: (3)
Re: 26 and 28 spline axles?
I know this thread is old, but the search doesn't pull up exactly what I'm wondering; hopefully someone can help me understand. I'm helping my son build his car, its a 90 RS with 305 TBI. We're wanting to switch it to dics in the rear, so I looked at the 4th gen rear end route and then went to Hawks and saw that they sell basically every rear end setup there, 3rd and 4th gen. I see that the 89 would be $550 and a 90 would be $1000, what am I missing? When I searched part numbers for u-joints an 89 and a 90 are the same part number, couldn't I just buy the $550 with disc brakes change out the u-joint and go back together with the 26 spline from an 89? Or is it easier/cheaper to do it different? Or am I just completely thinking about this wrong?
Last edited by Fullmonte77; 06-15-2020 at 01:00 PM.
#13
Re: differentials
What year Camaro axels did you use or did you have to order new ones? If so can you help me out with the link ?
I have a 87 and came across a torsen zexel
I have a 87 and came across a torsen zexel
!. Very few 89 f cars have 28 splines. 90-92 have 28 splines
2. 28 spline axel can bet used in a 26 spline houseing as long as you have a 28 spline carier.
3. I just did a swap on my 86 saturday. I swap in 3.23 gears, an Slp take out posi, And 28 spline axel. I didn't encounter any problems. Make sure you cangte your axel seals while you have the axels out!!!
2. 28 spline axel can bet used in a 26 spline houseing as long as you have a 28 spline carier.
3. I just did a swap on my 86 saturday. I swap in 3.23 gears, an Slp take out posi, And 28 spline axel. I didn't encounter any problems. Make sure you cangte your axel seals while you have the axels out!!!
Thread
Thread Starter
Forum
Replies
Last Post
Night rider327
Transmissions and Drivetrain
3
09-03-2004 08:11 PM