Differential Rebuild - Truetrac, 1310 U-ioints - Page 2

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  1. #11
    CelicaSupra.com Member SupraFiend's Avatar
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    I believe one other person has reported the smaller case size besides us with the diff we put into DeanFuns 85. I was going to ask about that, did your diff guy report having issues using factory carrier shims? I would like to know if ours was a "made on friday afternoon special", or if they actually intentionally changed the case size and all forthcoming cases are going to be like that.

    Also I was going to mention since it hasn't come up here yet, its always best to source a complete pumpkin with the gear set already in it that you want vs swapping in another R&P. You wouldn't have run into this since you ended up with a used case by necessity, but we swapped in a low miles 3.72 R&P from another diff and it highly complicated the install. The pumpkin cases, R&P and the pinion spacers (not the one for backlash) are a matched set. If you change any one of those 4 items, you are stuck using a monotonous process of trial and error of trying different pinion spacers till you get the pinion depth and pattern correct. Not to mention you will need a large range of pinion spacers on hand, and you will either need the weir solid pinion spacer kit (for setting backlash) or a large collection of crush spacers as you will burn one on every pinion spacer trial.
    Black 86 mk2 Project Car
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  3. #12
    CelicaSupra.com Member Funkycheeze's Avatar
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    Yeah, setting pinion depth can be a pain - you can do it without crushing a tube every time (the TSRM shows the way) but it is still preferable to get a pumpkin that has the gear ratio you want from the start.
    '84 P-type, 5spd, torrid red, black/grey leather
    Built 7MGTE (JE's, ARP studs, MHG), BOSS STG4 60mm, AEM standalone, R154, 2 1/2" IC and 3" turbo back - the works
    Coilovers, ROH wheels, 4 corner BBK, Konis, ADDCO bars, PST bushings etc. etc.

  4. #13
    CelicaSupra.com Member solid693's Avatar
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    if you get the marlin flange what else is needed to beef up the rear end? and drive shaft also?
    1984 MKIISupra parts car, 1986 MKIISupra daily driver

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  6. #14
    CelicaSupra.com Member Funkycheeze's Avatar
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    I don't think the marlin flange fits 7.5" diffs. Better to get a used one from the yard.

    Other than that, a solid pinion spacer, truetrac limited slip and quality gear set-up will do the trick. See my notes about pattern vs backlash and increasing carrier bearing preload on the previous page. I am experimenting with adding a .020 shim under the carrier bearing on the ring gear side of the truetrac, as a solution to ones that are a little 'short' and impossible to set up properly with the shim washer sizes available.
    '84 P-type, 5spd, torrid red, black/grey leather
    Built 7MGTE (JE's, ARP studs, MHG), BOSS STG4 60mm, AEM standalone, R154, 2 1/2" IC and 3" turbo back - the works
    Coilovers, ROH wheels, 4 corner BBK, Konis, ADDCO bars, PST bushings etc. etc.

  7. #15
    CelicaSupra.com Member solid693's Avatar
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    https://www.marlincrawler.com/axle/d...rential-flange
    So this won't work?! I'm trying to make a list of this I'm going to need for my swap


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    1984 MKIISupra parts car, 1986 MKIISupra daily driver

  8. #16
    CelicaSupra.com Member Funkycheeze's Avatar
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    Nope. That is for the spline on an 8" diff pinion gear. Too big for a 7.5"
    '84 P-type, 5spd, torrid red, black/grey leather
    Built 7MGTE (JE's, ARP studs, MHG), BOSS STG4 60mm, AEM standalone, R154, 2 1/2" IC and 3" turbo back - the works
    Coilovers, ROH wheels, 4 corner BBK, Konis, ADDCO bars, PST bushings etc. etc.

  9. #17
    CelicaSupra.com Member solid693's Avatar
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    ahh thanks funky for the correction, so pretty much get a used one or get the yukon gotcha
    1984 MKIISupra parts car, 1986 MKIISupra daily driver

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