Will a 31-Spline Diff fit in a 28-Spline 9″ Housing? #ApacheStroker [EP7]



We find out if a 31-spline differential will fit in a 28-spline housing…
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Detroit TrueTrac
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0:00 Coming up
2:12 Opening up our Ford 9 inch
4:11 Will a 31-spline differential fit in a 28-spline housing?
8:32 Ford 9 inch third member disassembly
13:55 28-spline Ring & Pinion kit
18:26 Fixing the press
20:06 Complete disassembly
21:57 Ford 9 inch third member assembly
26:51 31-spline bearing on Detroit TrueTrac
29:17 Venison
30:14 Will the press work?
35:23 Ring gear assembly
36:55 Pinion gear assembly
39:33 Back in the pumpkin
55:33 Setting ring & pinion backlash
1:02:34 Checking our work
1:03:48 Specialty Gear & Transmission
1:05:22 What’s next?

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39 Comments

  1. As far as I know with my years of axle building big and small bearing just refurs to the outer axle bearing nothing to do with the 3rd member but the housing is also bigger on the big bearing I have 35 spline shafts in my stock 3rd member

  2. Internet here. When you set up used gears, measure the backlash before and set to that, don't set them back up as though they're new. You want to set them up as close to the same as how they were so you don't wear a new pattern into the gears, they don't always like that.

  3. I worked at a 9" Ford specialist rear end shop for 19 years. You can even put a 35 spline carrier in a small bearing case. But that is not recommended as the bearing is so thin they burn up in street driving. But 31 spline is not an issue. And yes you need the pocket bearing retainer. Yes they All came with them and should have them. It would have been easier set up to use a solid spacer with shims rather than the crush sleeve. But it still works.

  4. It’s nice that it’s the easiest final drive on the planet to work on. They’re a real treat in my opinion.

    Technically should of checked the wear pattern before taking it all apart. The gears have mated together a certain way. It may not be the correct picture perfect pattern but it’s how they wore together. She may be abit noisy set up different

  5. The amount of videos I've seen on setting up a rear end they always point to the paint and say "see that? That's good engagement" ans every time I'm like "what? I can't see shit"

  6. Only one thing I see that needs to be done correctly, and that's every 9" that I've seen from the factory from the 60's and early 70's.
    The pinion housing, and front diff covers are red oxide primer, that's from the factory, and how they identified it themselves to avoid confusion during assembly.
    This is in all the Mustang manuals, the light duty trucks, Fairlane, Galaxy, and whatever else they used the 9" in.
    Just saying, not that you have to, but if you want it to be somewhat correct, and I'm pretty sure only the one's familiar with what I'm talking about will understand instantly what they're looking at.
    Who cares what anyone else thinks, because they're probably look they didn't even finish painting the diff housing.
    What a bunch of halfass people are they, but then they aren't up on the facts about 9" rear differentials are they…
    Just a bit of trivial knowledge for you to file away in your vast library of mental storage space.
    Nice to see someone appreciate the finer things in life without all the overpriced paint jobs over shiny chrome, sitting on a tube frame, and aftermarket sheet metal bodies, that someone else assembled.

  7. Fun to watch, setting up gears like you’re doing is an art in and of itself, not simple but not rocket science. Still putting this stuff together and taking apart over and over to dial it in can be incredibly frustrating so having a good attitude is the best place to start.

  8. Back in my working days, I used the old race as my installer. It's the right size and easy to knock back out should it get partially stuck.

  9. you do realize there are 3 diff bearing sizes for a 9" 2.86, 3.06, 3.25 third member, and 3 diff axle bearing sizes, old small old big and late Torino….most painful build to watch on here.

  10. New tool back boys .. scrubbing brush on the sawzall or the power drill depending which direction you need to clean a surface or hole…. Works so good… I even have a food grade Stainless steel wire ball for my drill to clean thermos's.

  11. Certain teflon seals will tell you not to lube ( some crank seals,) but every other seal in the world needs ( or at least would appreciate ) some lube before final assembly. A dry O-ring is a failed O-ring, every single time. IMO

  12. hi
    hemisphere/carrier bearings setup . Wind the adjuster closest to crown wheel in till back lash is within spec . Wind other adjuster hard up against carrier then do similar to wheel bearing adjustment . Once u get the adjusters set up then set preload . Wind adj that furthest away [from C/wheel ] inwards one hole DONE .

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