9 in rear end
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Senior User
Joined: Apr 2002
Posts: 113
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From: Clarksville, TN
9 in rear end
Do all trucks have 31 spline axles? What if any trucks had 28 spline axles? I'm changing my gearing from 4.11 to 3.50 and I am wondering what 9 in to look for out of the junk yard that had 28 splines and 3.50 gear ratio.
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Joined: Feb 2004
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early bronco all had 28 spline, junk yard shopping you need early bronco axles, they were a different length than any other ford, so pickup, van, etc will not work. now I think some of the older mustangs had 28 splines, so if you are lookin for a center section, I think that is what you need, most trucks and vans had 31 splines, so It would not be a drop in conversion, unless you got a 31 spline housing and bought some 31 spline axles( a good upgrade if youre breaking axles anyhow).
Posting Guru
Joined: Nov 2003
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From: East Flat Rock NC
A 31 spline will not fit though the end of the carrier or the bearings!
P.s I have ran in to this before ,I ended up going with a full spool that bolted
right in! Make sure that if you plan on trading out carriers that the bearing
bore in the case are of the same size there are 3 sizes .
P.s I have ran in to this before ,I ended up going with a full spool that bolted
right in! Make sure that if you plan on trading out carriers that the bearing
bore in the case are of the same size there are 3 sizes .
Last edited by Pro-Street/StateTK; Feb 5, 2005 at 06:13 PM.
Posting Guru
Joined: Nov 2003
Posts: 1,230
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From: East Flat Rock NC
( SP3006 ) as far as 73 being the magic # I have had enuff 73-79 trks to fill
a parking lot , and have never ran across one of mine that was 31 spline .
I do know there out there ! I just keep missing out on them .
a parking lot , and have never ran across one of mine that was 31 spline .
I do know there out there ! I just keep missing out on them .
Last edited by Pro-Street/StateTK; Feb 13, 2005 at 11:17 AM.
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Joined: Dec 2002
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From: Southern Oregon USA
It also depends on whether it is a 2 or 4wd and F100 and 150. My 77 4wd has 31 splines, my 76 F100 2wd had 28. A friend has a 75 F100 4wd with 31s and a 76 F100 4wd with 28's. I've never seen a 78 or later 4wd with 28's, but I've seen 2wds both ways into the early 80's.
Jason
Jason
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