Potential 8 Inch Diff Swap - Page 3

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  1. #21
    CelicaSupra.com Member gamble's Avatar
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    Quote Originally Posted by SilverMk2 View Post
    I kind of like mine it bolts right in.
    LOL understatement of the year so far. We all kind of like it too. That is radddddddd.

    Is there a wait list and expected cost range for this beauty or are you just building yourself a fleet of bulletproof mk2's?
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  3. #22
    CelicaSupra.com Member SupraFiend's Avatar
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    Quote Originally Posted by SilverMk2 View Post
    It's a IRS Ford 8.8. I built 5 of the front bracket so yes the plan is make 4 more. I have 3 of the stock front crossmembers to use as cores now so I can rotate them out pretty quickly when ready. It's a pretty simple mod, but it needs to be jigged correctly What's holding me up right now the arms. Having a hard time finding a local machine shop that will even give me the time of day. In the end pretty much all the parts are readily available off cars they make now. What you end up with is much stronger drivelines, multiple sway bar options, cheap brakes, many sizes of brakes, and most are much cheaper than the Mk2 equivalent.
    Arms, so you are trying to build a kit with new arms to get I assume built in adjustable camber correction, a new hub with stronger stubs and better brake options? If you are going to open up sales of that diff mount setup, I think many could get by with just that and the swaybar. If one has already done the camber mod and has rust free arms (and maybe JK rear brakes), all such a person would need is custom CVs to mate that to the stock hubs and they'd be good to go. There are certainly more then a few out there sitting in the power range Ryan is where they are breaking 7.5 diffs and axles but not stubs.
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  4. #23
    CelicaSupra.com Member SupraFiend's Avatar
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    (double post)
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  6. #24
    CelicaSupra.com Member Funkycheeze's Avatar
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    The stubs are tough - they are actually slightly larger than the pinion splines on the 7.5" diffs, so it would take plenty of power and some kind of mechanical locker or a welded diff/spool to get that much torque output on one wheel. Plus STICKY tires.
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  7. #25
    Boosting Mod SilverMk2's Avatar
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    Quote Originally Posted by SupraFiend View Post
    Arms, so you are trying to build a kit with new arms to get I assume built in adjustable camber correction, a new hub with stronger stubs and better brake options? If you are going to open up sales of that diff mount setup, I think many could get by with just that and the swaybar. If one has already done the camber mod and has rust free arms (and maybe JK rear brakes), all such a person would need is custom CVs to mate that to the stock hubs and they'd be good to go. There are certainly more then a few out there sitting in the power range Ryan is where they are breaking 7.5 diffs and axles but not stubs.
    Plan right now is to modify the stock arms by lobbing the end off to keep the cost down. Even doing that it's still quite expensive. I don't think honestly anyone is going to be that interested in the rear arm option since I'm basing it around 5 lugs. Yes the two upgrades are mutually exclusive. I think its a neccesity since the weakest link in the car will be the stubs and I'll be royally screwed if I break one of the MS123 ones.

    Cost wise the rear 8.8 conversion is pretty comparable in price to all the other ones out there I've found. A lot depends on how fancy you want it. Do you want powder coating, camber eccentrics, a DIY option. etc. Right now its too early to promise much since it has to work first...

  8. #26
    CelicaSupra.com Member SupraFiend's Avatar
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    5 bolt, if its 114.3x5, would appeal to many I think. Though less so then in the old days when there was barely any off the shelf wheels available. But a modded arm solution has less appeal to many. It would be awesome to have an aftermarket bolt in arm solution for sure as rust is a problem here for us too.

    I'm just going to go mk3 irs as others have done, but the l really should pick up an is300 irs and adapt that instead for the good of the community. It should work just as well if not better (almost certain its lighter), but I already have all the mk3 stuff so cost and risk wise it makes little sense for me. Though there are better aftermarket parts options and supply for those cars, hmmmm.
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  9. #27
    CelicaSupra.com Member SupraFiend's Avatar
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    I think that was my 10,000th post lol
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  10. #28
    CelicaSupra.com Member mutantcolors's Avatar
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    Rule of thumb, aluminum is 1/3 as stiff as steel. Not sure about its workhardening properties in comparison but they should be similar, 1/3 as good.

  11. #29
    CelicaSupra.com Member killbill oddy's Avatar
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    Quote Originally Posted by SupraFiend View Post
    Attachment 8121Attachment 8123Attachment 8125Attachment 8127Attachment 8129

    So as you can see, these diffs use axles almost exactly the same dims and size as ours. That's sort of a Minus really since our half shafts are a weak point, but we do have solutions for that and its kind of appealing that our half shafts could pretty much have the holes drilled up one size and it looks like they'd bolt to this diff. Yeah I know you'd still need to get custom axles made since this 8inch diff is notably wider, but still kinda neat. Anyways, I think the diff is in the same boat as the IRS. The mounting points are off by 10cms, which would put the bolt holes right on the ends of the aluminum. This one piece aluminum case\wing ear mount arrangement looks hella strong, but it does complicate swaps. Technically you could cut the mount and tig weld in an extension on each end though. And the sleave inside those diff bushings on just the diff are exactly the same size in both diameter and length for our studs. Thats a mk2 stud slipped in in the pic! Also a mk2 axel for comparison on that one photo. As for mounting at the front, get this, these diffs get all their strength from the back mounts, the just bolt to the front half of the subframe with a little ear tab and 2 bolt holes and an isolator bushing. That long piece at the very front of the diff appears to just be a resonance NVH thing, no holes on it, the 2 bolts further up are the mounting point. If one were to mod one of these diffs to fit, in theory you could get away with just hacking off the cradle from our subframe, then welding on a simple little ear like the Mazda suspension subframe.

    Anyways, its just an idea so I thought I'd share some info. I think there are probably better options out there for ease of swapping and availability, but it was pretty cool to see how Mazda was doing things back in the 80s too. Although this is from the end of the 80s when Toyota already had a double wishbone IRS out for several years, seeing all the extra tech put into a trailing arm setup was still kind of neat.
    That rear camber by the hub is well smart. Like that idea and never thought about that as an option before. Might have to copy that!
    As for the 8" diff upgrade, that's probably worth looking into a lot more. Bet finding a subframe in decent condition won't be easy though. Offset hole subframe bushes are easy enough, but body clearance would be the killer as you said.
    Keep playing with this though, as even if it's just the rear wishbones - i really like the camber adjustment possibilities

  12. #30
    Whistles racerxj220's Avatar
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    Quote Originally Posted by SupraFiend View Post

    I'm just going to go mk3 irs as others have done
    Make sure you reinforce it. I split mine in half at just 635+whp and ~500ftlbs.

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