28 spline axels?
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Junior User
Joined: Feb 2007
Posts: 80
Likes: 0
From: altoona
28 spline axels?
I have a 79 f150 2wd,that has a 450 hp 351c in it. I need to put better gears in it and I have a set of 389,s and a posi 28 spline. The only problems is my axels in my truck are 31 spline. Did ford put 28 spline axels in these trucks? If so I need a set.
thanks Jesse
thanks Jesse
Laughing Gas
Joined: Apr 2001
Posts: 868
Likes: 3
From: New Glasgow, Nova Scotia
With that kind of HP stay away from the 28 spline, I twisted a set of 28 off with a stock 429, changed to the 31's and it never came apart again.,
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Senior User
Joined: Oct 2007
Posts: 104
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From: winston salem N.C
In my experience the 28 spline only came in the 2wd. very rarely did they have 32. But every 4wd ive worked on was a factory 32 spline.
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Laughing Gas
Joined: Apr 2001
Posts: 868
Likes: 3
From: New Glasgow, Nova Scotia
I've had nothing but 2wd's and several rear gear changes over the years and have found both 28 and 31 spline axles. Not sure but the 31 may be part of the 150 HD with the 6050 GVW. I know my truck has the factory power train with a 3.50 LS 31 spline 9 inch.
Senior User
Joined: Aug 2003
Posts: 236
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From: Santa Barbara
I have the 6150 GVW package and I still got stiffed with 28 splines.
Lead Driver
Joined: May 2007
Posts: 6,993
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From: Costa Mesa, CA
It depends on what options came on the truck. If you're looking for 31's then start with the 4wds - as I don't remember ever seeing a 4wd w/ 28 spline. That doesn't mean the genious
that is ford never did it though. Trying to find 31 spline in a 2wd is more of a crapshoot. You may get lucky and find one with 31's - you may not.
that is ford never did it though. Trying to find 31 spline in a 2wd is more of a crapshoot. You may get lucky and find one with 31's - you may not.
