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8” IFS Clamshell w/FRS Torsen

Discussion in 'Technical Chat' started by bwawuz02, Jul 29, 2018.

  1. Aug 1, 2019 at 1:37 PM
    #241
    bwawuz02

    bwawuz02 [OP] Well-Known Member

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    This is the truth. If you can't understand what I did and why, you shouldn't be attempting this type of mod. The setup worked flawlessly for several thousand miles until someone decided to total the truck for me.
     
    Slashaar, bobsuruncle and Athlaos like this.
  2. Aug 1, 2019 at 2:00 PM
    #242
    Athlaos

    Athlaos Destruction Mode

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    Ya. I re-read everything and it makes a lot of sense now. I will definitely be doing it.
     
  3. Aug 1, 2019 at 2:03 PM
    #243
    GT7

    GT7 One piece at a time

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    my only question is will it work with the cv axle bearing/bushing. because our bushings dont work with awd so I dont know if it will work with ours.
     
    Athlaos[QUOTED] likes this.
  4. Aug 1, 2019 at 2:18 PM
    #244
    TireFire

    TireFire Superunknown Member

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    Damn after all that work. Did you buy it back for part out or repair?
     
  5. Aug 1, 2019 at 4:24 PM
    #245
    05Taco4x4

    05Taco4x4 ToyotaHubs

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    Yeah, that news sucks
     
  6. Aug 2, 2019 at 10:13 AM
    #246
    bwawuz02

    bwawuz02 [OP] Well-Known Member

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    No toyota ever came with a torsen differential in the front, so there isn't really one to model a setup after. I went with the setup I did, because I was sure that it would work without issue. If I had it to do all over again, I would probably just do a harrop e-locker with the AWD T-case. Torque steer with the torsen takes a little getting used to, but I didn't even notice it unless I was driving faster than I should've been.

    Losing my rig was a bummer, but c'est la vie. I picked up a ZR2 Bison with the baby duramax and haven't looked back.
     
    bobsuruncle and VE7OSR like this.
  7. Sep 5, 2019 at 6:30 AM
    #247
    DesertRatliff

    DesertRatliff Well-Known Member

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    Bumping this informative thread.
     
    Last edited: Oct 18, 2023
    bobsuruncle likes this.
  8. Sep 5, 2019 at 6:36 AM
    #248
    TireFire

    TireFire Superunknown Member

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    Yes, that will work like clockwork.

    But it’s got nothing to do with what the OP did
     
  9. Sep 5, 2019 at 6:57 AM
    #249
    DesertRatliff

    DesertRatliff Well-Known Member

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    Got a better place for unconventional front diff chatter? Got a link to "will work like clockwork"?
     
    bobsuruncle likes this.
  10. Oct 2, 2019 at 2:46 PM
    #250
    RatoDato

    RatoDato New Member

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    13b-turbo Full custom suspension Holder hx40 turbo Haltech platinum 76 hilux rear end
    Here I was thinking I was the only one who stumbled across this little hack. Can't find any write ups on it so ive been hesitant to buy the frs diff. Then bam, confirmation. I'm building a drift truck out of my 620 and decided upon a pre 78 8 inch since it didn't require shortening and I've seen their durability (worked at a diff shop for a few years). I figured being a g series it would work and be cheaper than a kaaz unit. I think having to drill out some holes is worth the 1/10th cost of all the other torsion options. Thanks for the write up. Now I can move on with the build as scheduled.
     
  11. Oct 26, 2019 at 4:51 PM
    #251
    bobsuruncle

    bobsuruncle I void warranties

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    I just bought a 2018 front clamshell with 4.30's in it. Should be at my house in a week. I'll be updating my build thread with the process.
     
  12. Oct 27, 2019 at 7:12 PM
    #252
    DesertRatliff

    DesertRatliff Well-Known Member

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    Awesome! Please tag me if you post elsewhere. Thanks!
     
    bobsuruncle likes this.
  13. Jun 24, 2020 at 7:14 AM
    #253
    DSG1985

    DSG1985 New Member

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    Sorry to be reviving an old thread, but there is some good info here. I just don't feel like all the questions have been answered, at least not in one place.
    I've read the whole thread and these are the lingering questions I have:
    1) Does an FRS diff carrier work for sure in an 8" clamshell with ADD? If not, why?
    2) Does the diff housing need to be ground for clearance or not?
    3) Does the ECGS bushing work? Is machining required?
    4) Are there any issues (other than the bolt hole size) with using 4.88 gears meant for an 8" clamshell?
    5) What is done about the smaller bearing ID? Does anything need to be machined? Just use the 90366-50001 FRS bearings with 50mm ID?
    6) Have you actually done this mod? What was your experience? Any long-term issues?
     
  14. Mar 9, 2021 at 2:13 PM
    #254
    *kronik*

    *kronik* New Member

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    Hey Guys, so i have been following this thread as i was considering the options for a front LSD instead of an E-Locker.
    My truck has 3.91 gearing currently with an ADD front differential. 4wd (4H & 4L) is manually engaged via a shift lever.
    Using this guide, does it mean its possible to have a helical LSD installed to the front?
    How will this interact with the ADD system? since it only releases the right side axle from the differential center.
     
  15. Jun 25, 2021 at 12:26 PM
    #255
    crashnburn80

    crashnburn80 Vehicle Design Engineer

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  16. Jun 25, 2021 at 3:51 PM
    #256
    ClassyTacos

    ClassyTacos I must know whats on page 47

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    Came across this thread and wanted to share. East Coast Gear Supply offers a Torsen for the front clamshell, I noticed it when I was putting my order in. ecgs Torsen.jpg
     
    TacoEspecial likes this.
  17. Jun 25, 2021 at 4:05 PM
    #257
    crashnburn80

    crashnburn80 Vehicle Design Engineer

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    Wonder if it is the same one I posted above, since I looked in the past and hadn't seen any on the market. Hence the OPs thread about how to make one happen.
     
  18. Jun 26, 2021 at 5:08 AM
    #258
    ClassyTacos

    ClassyTacos I must know whats on page 47

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    I was thinking it could be the same one too. I gave it some thought when I was ordering, I ended up with ARB. I'm fairly certain the Raptor has a Torsen in the front stock, but I'm not sure.
     
    Last edited: Jun 26, 2021
  19. Jun 26, 2021 at 8:46 AM
    #259
    05Taco4x4

    05Taco4x4 ToyotaHubs

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    I purchased the one of this thread for about $250 on eBay almost immediately after OP posted his pics, been sitting because I hate pulling these diffs by myself. I do want to install it, can't wait until I quit reno my house and get back to truck stuff.
     
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  20. Dec 24, 2022 at 7:37 PM
    #260
    Silverlogic

    Silverlogic Well-Known Member

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