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Author
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Topic: 31 Spline Axles
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svt522
Gearhead Posts: 124
From: Hampton, Va
Registered: Jul 2001
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posted 12-21-2004 08:29 AM
   
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!------------------
Kevin
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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MLariviere
Moderator Posts: 3984
From: Biddeford,Me.USA
Registered: May 99
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posted 01-02-2005 11:27 PM
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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DidgeyTrucker
Gearhead Posts: 1190
From: Greenbrier, TN USA
Registered: Oct 99
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posted 01-22-2005 06:52 PM
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. Tracy
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TomP
Gearhead Posts: 5761
From: Delta BC Canada
Registered: Dec 99
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posted 03-06-2005 02:04 AM
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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