Potential 8 Inch Diff Swap - Page 4

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  1. #31
    CelicaSupra.com Member SupraFiend's Avatar
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    Yeah there's that too, another incentive to just go is300. I was going to reinforce, but the thing is already really heavy. But i'm not planning big big power anyways.

    Killbill, the "camber by the hub", are your referring to the adjustable camber on the outer A arm mount? That is essentially what we have all been doing to our subframes for the last 15+ years here. There's actually been 3 different camber bracket kits made over the years, Raptor's was the last. It works, but only accounts for up to about 1.5 inchs of ride height variance. Depending on where you mount the bracket you can get that same range to compensate for a car thats been extremely lowered, but you will have to reclock the inner mounts too if you drop the mount low enough to compensate for the 1.5+ inch drops. Now the inner A arm mount and the stabilizing arm the FC runs is interesting! That would negate the need for re-clocking the inner mount, though I assume they did it to improve the inherent crap roll center trailing arms have. Anyways, like I said its pretty interesting, but it was blip in history, Mazda went full double wishbones 2 year later and never looked back (as should be, looking at you bastard mk5 supra). FD IRS...

    Black 86 mk2 Project Car
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  3. #32
    CelicaSupra.com Member Deanfun's Avatar
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    8" GX71 differentials do exist, if you really want one. I passed on one a few weeks ago that would have been CAD$1200 in my hand.

    This morning, I bought this in rough shape:
    https://www.rinkya.com/en/auction-s687347002

    At $1200, the diff is still a small part of the cost to get it in the car. At $30, I'm sure there will be seals that cost more than the case. I guess we'll see what it looks like when it gets here.
    Dean L.
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  4. #33
    CelicaSupra.com Member Funkycheeze's Avatar
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    I got one a few months ago and Dean finally found one too. I'll be doing the swap this winter - looks like a bit of fab work will be required, probably moving a few mounting holes on the big diff crossmember(and custom CV shafts) but nothing major. I plan to rebuild it with a T2 Torsen from a FRS/BRZ and a 29 spline brand new 3.73 R&P rebuild kit from DM with a new input flange that also has a 66x66x11mm bolt up pattern (along with the smaller 60x60x10 that is the same as the truck diff big input flange for the 7.5). Then I can use a 1330 U joint at the back on the 66x66 pattern, and a DM 1350 slip yoke at the trans (that has removable ears so I can get the driveshaft out of the car without removing the diff) and a 1350 to 1330 crossover U joint at the front. Then the only part of the drivetrain left stock is the stub shafts in the control arms but they are pretty tough, not much chance of breaking one unless you are running a spool or welded diff!
    '84 P-type, 5spd, Super red, black/grey leather - 2JZGTE swap, Precision 6262 on cast manifold, ECUmaster black with 875cc/min injectors, 465 WHP at 17 psi, built R154 with OS Giken twin plate, one piece driveshaft with 1310 joints, Truetrac with 3.73 R&P, 450 lb/in front coilovers, 300lb/in rear springs, Image BBM wheels 17x8 and 18x10, 4 corner BBK, AGX shocks, Whiteline bars, poly bushings, T3 GTX2 front control and steering arms etc. etc.

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  6. #34
    CelicaSupra.com Member Deanfun's Avatar
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    I got a rusty present yesterday...



    Dean L.
    1985 Toyota Supra - Hidden Content
    2000 Lexus LS400
    2007 Lexus LX470

  7. #35
    CelicaSupra.com Member Funkycheeze's Avatar
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    Yep yep, I already did a bunch of measuring and speccing out of parts etc. With a 29 spline brand new R&P, solid spacer, T2 Torsen, custom axle shafts, and a single piece driveshaft that has 1330 U joints on each end it should be pretty much indestructible in a mk2. The T2 torque bias ratio is around 2.5:1 so you can only ever get about 71% of the torque to one wheel, so I'm not worried about the stub shafts in the control arms so much, I've only ever seen them get broken with welded diffs and low gearing (4.30 or similar). The splines are pretty big.
    Last edited by Funkycheeze; 10-16-2019 at 05:17 PM.
    '84 P-type, 5spd, Super red, black/grey leather - 2JZGTE swap, Precision 6262 on cast manifold, ECUmaster black with 875cc/min injectors, 465 WHP at 17 psi, built R154 with OS Giken twin plate, one piece driveshaft with 1310 joints, Truetrac with 3.73 R&P, 450 lb/in front coilovers, 300lb/in rear springs, Image BBM wheels 17x8 and 18x10, 4 corner BBK, AGX shocks, Whiteline bars, poly bushings, T3 GTX2 front control and steering arms etc. etc.

  8. #36
    CelicaSupra.com Member SupraFiend's Avatar
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    Very cool!

    To continue the 8 inch diff swap talk, I was down at Junkie's garage last week (visiting the famous Satoshi\Rosso from the old days on this board!), and checking out Mike's crazy v12 and Darrow's awesome 2jzge vvti swaps (got to drive both ). Naturally the talk turned to Crambo's crazy v12 conversion, 2jzs and big power and I filled them in your guys 8 inch diff adventures. I mentioned that the is300 diff is a really good way to go too if you are going to swap the entire IRS. Shawn brought up a good point, pulling axles on the is300 IRS is a pain. He used to pull them at Nix99 (long defunct wrecker in WA) and the nuts would strip when they come off. They would have to re-thread them after as they couldn't bolt back together after being removed. I did some research after that and it sounds like its the actual nut is a 1 time use part. Sounds like you have to buy new nuts every time you want to remove a half shaft on those IRS setups. Thats not a thing on the mk4 Supra, sc400, gs400 etc IRSs though. Anyways, not a deal breaker, but something to be aware of. I still think the IRS in the IS is the best choice these days in terms of design and availability, but I havn't thrown a subframe under a mk2 yet to see if its even feasible, just eyeballed them and confirmed it mounts similarly to the mk3 setup (which we know can be adapted).
    Black 86 mk2 Project Car
    New SDR 86 mk2 Daily User, Highway Cruiser AND Parking Lot Abuser in the works!

  9. #37
    CelicaSupra.com Member Deanfun's Avatar
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    Here's an early one for sale - note the 4-bolt stub axles. you'd want to swap those out for 6's.

    https://www.rinkya.com/en/auction-u313687302
    Dean L.
    1985 Toyota Supra - Hidden Content
    2000 Lexus LS400
    2007 Lexus LX470

  10. #38
    CelicaSupra.com Member SupraFiend's Avatar
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    Nice! Thats a good deal so far.
    Black 86 mk2 Project Car
    New SDR 86 mk2 Daily User, Highway Cruiser AND Parking Lot Abuser in the works!

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