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Author Topic:   31 Spline Axles

Posts: 124
From: Hampton, Va
Registered: Jul 2001

posted 12-21-2004 08:29 AM     Click Here to See the Profile for svt522   Click Here to Email svt522     Edit/Delete Message   Reply w/Quote
I've got the chance to buy a 31 spline traction lock with a 3.50 ratio. My old truck is 28 spline. Does anyone know what year they started putting 31 spline axles in F-100s? My Detroit Locker is going to find a home in my Stang. The 3.50 ratio would be better with the 3.75 first gear in my truck's 5-speed. The 4.11s are a little steep!

1996 SVT Cobra (#522)
1967 F100 w/85 Roller Cam 5.0, 5-Speed, 4.11 Detroit Locker, GT Mustang SEFI
1973 "Q" Code Mach1, 3/4 Vinyl Top, Fold-Down Rear Seat, A/C

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Posts: 3984
From: Biddeford,Me.USA
Registered: May 99

posted 01-02-2005 11:27 PM     Click Here to See the Profile for MLariviere   Click Here to Email MLariviere     Edit/Delete Message   Reply w/Quote
Anyone with the answer? I am going to say 1973-74. That was about when the big blocks{460} came out.

[This message has been edited by MLariviere (edited 01-02-2005).]

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Posts: 1190
From: Greenbrier, TN USA
Registered: Oct 99

posted 01-22-2005 06:52 PM     Click Here to See the Profile for DidgeyTrucker   Click Here to Email DidgeyTrucker     Edit/Delete Message   Reply w/Quote
9" truck rear ends from 1957 through 1972 are the same width, I have heard that somewhere in the '67-'72 series the 31 spline axles showed up in the trucks. I took axles out of a '72 FE powered F-100 that were solid with two holes on the end that were 28 splines.

My '78 (400/auto) F-150 has longer 31 spline axles that won't fit the '72 and older housings.


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Posts: 5761
From: Delta BC Canada
Registered: Dec 99

posted 03-06-2005 02:04 AM     Click Here to See the Profile for TomP   Click Here to Email TomP     Edit/Delete Message   Reply w/Quote
Yeah, i've never run across any 72 and older 31 splines. Might have been 390 with 4 speed and highest GVW only.

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