Spline Pinion?
Thread Starter
Member
iTrader: (1)
Joined: May 2005
Posts: 365
Likes: 0
From: Pasadena
Car: 87 Z28
Engine: uh does the name give u a hint
Transmission: 700r4
Axle/Gears: 2.73
Spline Pinion?
Hey i was just trying to figure out how to find out what my spline pinion number was and how to find out?
Thread Starter
Member
iTrader: (1)
Joined: May 2005
Posts: 365
Likes: 0
From: Pasadena
Car: 87 Z28
Engine: uh does the name give u a hint
Transmission: 700r4
Axle/Gears: 2.73
ok here's why, i am planning on converting m y limited slip to posi and my drive shaft spline count is 28 and i was also wanting to change the rear gears from 2.73-3.73 and need to know what my Spline Pinion count is 27, 30, Etc.? any one know
Thread Starter
Member
iTrader: (1)
Joined: May 2005
Posts: 365
Likes: 0
From: Pasadena
Car: 87 Z28
Engine: uh does the name give u a hint
Transmission: 700r4
Axle/Gears: 2.73
well cause thats the thing when i was looking at the new gears section in jegs or summit for gears u look for spline pinion. and when looking for a posi you look for spline
Moderator
Joined: Jul 1999
Posts: 17,263
Likes: 168
From: 51°N 114°W, 3500'
Car: 87 IROC L98
Engine: 588 Alcohol BBC
Transmission: Powerglide
Axle/Gears: Ford 9"/31 spline spool/4.86
All 7.5/7.625 pinions are 27 spline. There are no other options for this 10 bolt.
Axle splines are something different. 1989 and older 7.5" 10 bolts are 26 spline. 1990 and up are 28 spline axles.
Axle splines are something different. 1989 and older 7.5" 10 bolts are 26 spline. 1990 and up are 28 spline axles.
Last edited by AlkyIROC; Feb 22, 2006 at 10:59 PM.
Supreme Member
Joined: Jan 2003
Posts: 1,931
Likes: 1
From: Ontario, Canada
Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
Transmission: T-5 World Class
Originally posted by Stephen 87 IROC
All 7.5/7.625 pinions are 27 spline. There are no other options for this 10 bolt.
Axle splines are something different. 1989 and older 7.5" 10 bolts are 26 spline. 1990 and up are 28 spline axles.
All 7.5/7.625 pinions are 27 spline. There are no other options for this 10 bolt.
Axle splines are something different. 1989 and older 7.5" 10 bolts are 26 spline. 1990 and up are 28 spline axles.
you mean 26 spline . I just did mine
Trending Topics
Joined: Sep 2005
Posts: 27,881
Likes: 2,434
Car: Yes
Engine: Usually
Transmission: Sometimes
Axle/Gears: Behind me somewhere
All GM 7.5" / 7.625" pinions have 27 splines, like Stephen said; and are 1.438" diameter.
Yes I've done a certain number of them myself as well, over the years; in these cars, as well as others that use the same rear.
90-up axles and the carrier side gears usually have 28 splines.
88-back axles and side gears always have 26 splines.
89 rears could have either; a large majority got the 26s, but a few got the later model stuff. Probably something like 80-85% vs 15-20%.
There is no error in Stephen's post.
Yes I've done a certain number of them myself as well, over the years; in these cars, as well as others that use the same rear.
90-up axles and the carrier side gears usually have 28 splines.
88-back axles and side gears always have 26 splines.
89 rears could have either; a large majority got the 26s, but a few got the later model stuff. Probably something like 80-85% vs 15-20%.
There is no error in Stephen's post.
TGO Supporter
Joined: Aug 1999
Posts: 14,811
Likes: 1
From: Jackson County
i just reread your reply and this is going to be alot easier than you thought, and cheaper. the only big differance between limited slip and posi is the way the letters are arranged. you already have posi if you have limited slip, or you already have limited slip if you have posi.
Supreme Member
Joined: Jan 2003
Posts: 1,931
Likes: 1
From: Ontario, Canada
Car: 1989 IROC-Z
Engine: 5.7L EFI LTR setup
Transmission: T-5 World Class
Originally posted by sofakingdom
All GM 7.5" / 7.625" pinions have 27 splines, like Stephen said; and are 1.438" diameter.
Yes I've done a certain number of them myself as well, over the years; in these cars, as well as others that use the same rear.
90-up axles and the carrier side gears usually have 28 splines.
88-back axles and side gears always have 26 splines.
89 rears could have either; a large majority got the 26s, but a few got the later model stuff. Probably something like 80-85% vs 15-20%.
There is no error in Stephen's post.
All GM 7.5" / 7.625" pinions have 27 splines, like Stephen said; and are 1.438" diameter.
Yes I've done a certain number of them myself as well, over the years; in these cars, as well as others that use the same rear.
90-up axles and the carrier side gears usually have 28 splines.
88-back axles and side gears always have 26 splines.
89 rears could have either; a large majority got the 26s, but a few got the later model stuff. Probably something like 80-85% vs 15-20%.
There is no error in Stephen's post.
Oh , crap I thought he ment axles
Sorry about that . 
Thread
Thread Starter
Forum
Replies
Last Post
dimented24x7
Transmissions and Drivetrain
7
Sep 17, 2015 06:58 AM
UltRoadWarrior9
Transmissions and Drivetrain
3
Sep 2, 2015 08:24 PM
