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9 inch info needed 31 spline
#1
Hi Guy's

I score a deal on a complete 1970 f 100 rear end , net says same width as our cars. Its 31 spline limited slip. The guy even had records of its maintenance. I brushed the undercoat on one spot and its painted white lol. Soooo... it 5.5x5 my unilug rims only go 5x5. I'm either going to get new rims or see if a machine shop can re drill the axle shafts for 4.5 anyone ever done this? but then Id have to do something about the brakes as they are 11 inch vs 10 on ours Its 3.54 ratio . I need to cut off the spring perches and shock bracket and weld on some new perches. Its a big bearing I assume and the axle tube is the same diameter doesn't taper. Good deal for 245 Canadian. Also the yoke I beleave is 1350 or 1330. If I put my yoke on it do I have to replace the crush sleeve? whats involved here? I haven't measured yet but are all 9 inch axles centered on the yoke?        
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#2
It will be WAY too wide.

But your could purchase 31 spline axles for your housing and run that third member in it.
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#3
Bentworker;284461 Wrote:It will be WAY too wide.

But your could purchase 31 spline axles for your housing and run that third member in it.

71-73 61.25
70 f 100 61.25

So same width,
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#4
I think it is the same width as well but... I think in the long run it would be easier and cheaper to swap the third member and get new axels to fit. Especially given the different bolt pattern and other brake size issues.

73 Grandé H Code. Headman long tube headers, T-5 Transmission, 3.70 Traclok, Lowered 1" all around, Aussie 2v heads w/ 2.19 intake, 1.71 exhaust, screw in studs, full roller cam 608/612 lift 280/281 duration LSA 112, Quick Fuel 750 CFM double pumper, AirGap intake.

- Jason


[Image: 082-hot-rod-power-tour-2017-1970-1970s.jpg]
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#5
73pony;284472 Wrote:I think it is the same width as well but... I think in the long run it would be easier and cheaper to swap the third member and get new axels to fit. Especially given the different bolt pattern and other brake size issues.

Yes thanks, I do like the massive 11 inch drums though , I'm pulling the axles out of it tonight because back in 70 a 28 spline can look just like a 31 if your going by the look of the end of the axle. If it turns out to be a 28 i can just swap that 3rd member in my car, and possible change the yoke as they are different. I'm planning on new U.S mags u101 slot rims just like i already have, If I use the axle the way it is I'll just order 2 5x5.5 rear 10 inch wide rims with the right offset. Planning on running staggered either way.
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#6
Doh! I was wrong.
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#7
Using the current axles will mean you need two different spare wheel sizes or a unilug design that some aluminum wheels had. The picture is of a regular 28 spline 9" in my vert. Had to replace broken stud. I don't think there would be room to drill the mustang bolt pattern in the truck axle due to the three access holes in the axle to get to the 4 bolts on the axle flange and maintain balance. The boss on the axle might also have a larger diameter than mustang, Mercury did I know. That is what carries the weight of the car and centers the wheel not the lug bolts.
Always look under the trucks and vans in 60's and up until they went to Spicer type. I got a 9" 28 spline N case out of 1969 ford van that everything fits the mustang same yoke even. The housing on a van is offset to one side so it is of no use unless you want to make a narrowed housing. These go to the crusher and most never look at the center section.
If you have a friend with a lathe, mill and a dividing head you can cut the axles off and re-cut the splines on long axles that are not tapered, big bearing axles I think. You can get a roll pin dimension across the splines and cut new the same.
If you are going to punish the rear with big HP paint a stripe on the axle and then you can tell if they are twisting and about to break.


When a man is in the woods and talks and no women are there is he still wrong??
Tongue
David
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#8
++ 1 on the other comments. I would swap out the third member and get new axles. All of the changes required to that axle just to maintain an 11 drum sound challenging.

BKDunha
72 Mach 1 H-Code (Concourse driven restoration)
67 S-Code Factory GT with 4-Spd

68 Mercury Cyclone (Pro-Street project)
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#9
I'm building a 53 f100. It came with a 1970 truck rear. I found that it had 28 spline axles. The tag on the 9" decoded to a 3.50 open with a 8.75 ring gear, not a 9". Is the tag still on the center section?

[Image: FE177109-A1-C8-4-A6-C-9224-AACCFD66-C3-C9.png]

Rick Bombard
1971 Grabber Green Mach 1 351C 4V
2013 Race Red California Special Convertible
1973 Medium Copper Metallic Convertible 302 4V     SOLD
1953 F-100 project

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#10
71mach351;284504 Wrote:I'm building a 53 f100. It came with a 1970 truck rear. I found that it had 28 spline axles. The tag on the 9" decoded to a 3.50 open with a 8.75 ring gear, not a 9". Is the tag still on the center section?

No was missing. I took it apart last night and its 28 Spline !!! Now I can swap it in my mustang housing, the gears looked very nice, 3.50 ratio and limited slip. 98% sure its a direct swap in. My gears were 2.79 or something like that so 3.50 should be real nice! How can I tell if it 8 3/4 vs 9?
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