28 vs 31 spline axles? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

blazer2007 · 08-27-2010, 03:10 PM

I finally got my ford 9 inch home and apart.I,ve found a center sec. that has a posi with 4;11 gears 31 spline,but my axles lyed ,they are a 28 spline.But I have to decide on getting new 31 axles or put gears in my old center sec.I know everyone likes the 31 splines but am I going to lose anything from just 3 splines. Will be in a 454 450 hp truck,no strip but some abuse

raisinracer · 08-27-2010, 04:48 PM

Go ahead and spring for a set of new axles w/31 splines. With a big block power and 30-50 year old 28 spline axles , if you put a sticky tire on it they won't live. For $400 you can get new 31 spline axles ,bearings studs and retainer plates. If you can look at a 28 and 31 spline side by side ,you'll see a big diff.

ripdog28 · 08-27-2010, 05:41 PM

Go 31 spline and look around for some used ones or a new set is 3-400. A set of gears will be 150 so why not get the extra insurance.

blazer2007 · 08-27-2010, 06:08 PM

Thanks for the input,just some added info,the rear is from 74 ish t-bird with the big drum brakes and looks like the large bearings,the axles are tapered abit at the end ,not like the severe taper on some 28,s.Just wondering why they ran some 28,s in the b.b. fords,anyway just wasn,t sure where to send my paycheck

08-27-2010, 03:10 PM	#1
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	28 vs 31 spline axles? I finally got my ford 9 inch home and apart.I,ve found a center sec. that has a posi with 4;11 gears 31 spline,but my axles lyed ,they are a 28 spline.But I have to decide on getting new 31 axles or put gears in my old center sec.I know everyone likes the 31 splines but am I going to lose anything from just 3 splines. Will be in a 454 450 hp truck,no strip but some abuse

08-27-2010, 04:48 PM	#2
raisinracer Registered User Join Date: Feb 2010 Location: Las Vegas, NV Posts: 19	Re: 28 vs 31 spline axles? Go ahead and spring for a set of new axles w/31 splines. With a big block power and 30-50 year old 28 spline axles , if you put a sticky tire on it they won't live. For $400 you can get new 31 spline axles ,bearings studs and retainer plates. If you can look at a 28 and 31 spline side by side ,you'll see a big diff.

08-27-2010, 05:41 PM	#3
ripdog28 Registered User Join Date: Apr 2008 Location: Imperial Beach, CA Posts: 1,040	Re: 28 vs 31 spline axles? Go 31 spline and look around for some used ones or a new set is 3-400. A set of gears will be 150 so why not get the extra insurance. __________________ 69 c-10 BBC 462ci, forged crank, H-beam rods, 10.5-1 KB forged pistons, Dart Iron Eagle 308cc, Straub Cam, Comp Cams chrome moly full rollers, Weiand Team G, Prosystems 950, TH400/3500 Dalenzie stall, Currie 9+ Detroit Locker w/31spline axles.3.5/6in drop. My Build.

08-27-2010, 06:08 PM	#4
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	Re: 28 vs 31 spline axles? Thanks for the input,just some added info,the rear is from 74 ish t-bird with the big drum brakes and looks like the large bearings,the axles are tapered abit at the end ,not like the severe taper on some 28,s.Just wondering why they ran some 28,s in the b.b. fords,anyway just wasn,t sure where to send my paycheck



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