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

blazer2007 · 10-03-2010, 02:58 PM

I,m just doing a ford 9 in. for my truck with a 454 450 hp and plan on running about a 4;11 gear ratio, but looking at my options and was wondering why the 28 spline is not a good choice to run, is only 3 teeth.I can find a 28 sline posi but then I need the gears and someone to set it up, or I found a 4;11 posi drop out with 31 splines but then I have to buy axles.

blazer2007 · 10-06-2010, 10:28 AM

anyone here,hello

kpeztruck · 10-06-2010, 11:04 AM

The 31 spline will be stronger. How much? Who's to say if they are stock axles. If you plan to ever hit the track with it, I would not run any less than 35 spline. A lot of body damage when the axle snaps and you take out the tree, or hit the wall. If just for the street, I would still lean towards the 31 spline. One good burnout, and one side hooks hard when you let out of the gas, and you can snap an axle as well. Paul Baxter

ripdog28 · 10-06-2010, 11:50 AM

31 is much stronger then 28. Yes only 3 splines but that is a bunch more contact area. I have Currie Forged Alloy 31 splines and feel real good with them.

blazer2007 · 10-06-2010, 04:20 PM

ok thanks,I.ll go with the 31 spline and since I have to get new ones made I,ll spend the extra $ and get some good ones

kpeztruck · 10-06-2010, 05:29 PM

Quote:

Originally Posted by blazer2007

ok thanks,I.ll go with the 31 spline and since I have to get new ones made I,ll spend the extra $ and get some good ones

Good choice, I think you will be happy with your present combination, and most importantly safe!

10-03-2010, 02:58 PM	#1
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	28 spline vs 31 spline ? I,m just doing a ford 9 in. for my truck with a 454 450 hp and plan on running about a 4;11 gear ratio, but looking at my options and was wondering why the 28 spline is not a good choice to run, is only 3 teeth.I can find a 28 sline posi but then I need the gears and someone to set it up, or I found a 4;11 posi drop out with 31 splines but then I have to buy axles.

10-06-2010, 10:28 AM	#2
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	Re: 28 spline vs 31 spline ? anyone here,hello

10-06-2010, 11:04 AM	#3
kpeztruck Registered User Join Date: Sep 2010 Location: Canton, GA Posts: 229	Re: 28 spline vs 31 spline ? The 31 spline will be stronger. How much? Who's to say if they are stock axles. If you plan to ever hit the track with it, I would not run any less than 35 spline. A lot of body damage when the axle snaps and you take out the tree, or hit the wall. If just for the street, I would still lean towards the 31 spline. One good burnout, and one side hooks hard when you let out of the gas, and you can snap an axle as well. Paul Baxter

10-06-2010, 11:50 AM	#4
ripdog28 Registered User Join Date: Apr 2008 Location: Imperial Beach, CA Posts: 1,040	Re: 28 spline vs 31 spline ? 31 is much stronger then 28. Yes only 3 splines but that is a bunch more contact area. I have Currie Forged Alloy 31 splines and feel real good with them. __________________ 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.

10-06-2010, 04:20 PM	#5
blazer2007 Registered User Join Date: Jan 2007 Location: vernon b.c. Posts: 3,022	Re: 28 spline vs 31 spline ? ok thanks,I.ll go with the 31 spline and since I have to get new ones made I,ll spend the extra $ and get some good ones



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