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Official Crawlbox BS thread!

Discussion in 'Technical Chat' started by HomerTaco, Mar 16, 2016.

  1. Mar 22, 2020 at 5:35 PM
    #1541
    hoverlover

    hoverlover Warfin three nineteen

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    Test fit was good

    6831B8EB-ACFA-44C6-9D35-9889CE53FC9D.jpg

    Now let's make it permanent

    BF0CD996-F44B-4B49-A03C-5774D8C174F8.jpg

    38F7C840-B3B9-4999-B15C-7FD5932DC916.jpg

    70F5ACA9-E4FA-4BD0-84F0-FE2D249E9C64.jpg

    9A301FB1-7D15-41BD-BE93-674C143B7165.jpg

    8D786419-58BA-440F-9428-2A5D851FBEF7.jpg
     
  2. Mar 22, 2020 at 7:49 PM
    #1542
    hoverlover

    hoverlover Warfin three nineteen

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    Ready to rock

    DBBDDDD9-0F11-4B9C-9B73-C003F00AB816.jpg
     
  3. Mar 22, 2020 at 9:34 PM
    #1543
    Spoonman

    Spoonman Granite Guru

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  4. Mar 25, 2020 at 10:54 AM
    #1544
    feesquivel

    feesquivel Well-Known Member

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    Hey TW members, new to this thread but I keep having issues with my setup. Long story short my output and input splines keep stripping on me, everyone under a different situation (travelling, around my block, hwy and climbing a rock wall). 2007 doublecab tacoma with fj twin stick case built by rocksolidtoys.

    Has anybody ran into this issue as well? Does this look like sufficient spline engagement? At the moment I am thinking its spline engagement or lack of lubrication.

    [​IMG]

    [​IMG]

    [​IMG]

    For more detailed information, I created this post.

    https://www.tacomaworld.com/threads/crawler-box-splines-keep-stripping.638372/

    Marlin's reasoning is the coupler on the transmission side is too long and its preloading the gearbox causing the damage.

    Just got the case rebuilt by marlin and I am about to throw it back on the truck, if anybody could share some insight would be helpful.

    Thanks

    Fed
     
  5. Mar 25, 2020 at 11:16 AM
    #1545
    Littles

    Littles Stupid is as stupid does

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    Are you using a coupler supplied by Marlin on the transmission side?

    I would think that your spline engagement is about the same as everyone else on here running a marlin.
     
  6. Mar 25, 2020 at 11:28 AM
    #1546
    feesquivel

    feesquivel Well-Known Member

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    Yes sir, Marlin provided coupler. This would be the third coupler I am changing.

    First one measured ~3.793", 2nd one measured 3.623" and the one I have installed right now (latest from marlin) is 3.514".

    Took some measurements and if my math is correct I should have 3.521" available in between output/input shafts, so barely under.

    2nd and 3rd coupler comparison.jpg
    2nd and 3rd transmission side coupler.

    length calculations.jpg

    Please note, once the coupler was fully in. The final inner measurement is 2.675", marlin measured theirs to be 2.7". So there shouldn't be any preloading anymore.
    coupler installed on transmission.jpg

    Still don't know how this is causing my splines to strip :confused:.
     
  7. Mar 25, 2020 at 11:38 AM
    #1547
    Littles

    Littles Stupid is as stupid does

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    I have one sitting at home I'll measure for you tonight. If it's shorter, you're welcome to it. I am skeptical of Marlin's explanation and also curious to know how that would cause stripping on the output side of the crawlbox/input of the tcase. I would think it would create an issue with you even being able to bolt the crawl box to the trans to begin with, and that it would create the higher forces between the trans and the crawlbox, not the crawlbox and the tcase.
     
    hoverlover and feesquivel like this.
  8. Mar 25, 2020 at 11:40 AM
    #1548
    wrmathis

    wrmathis Dark Lord of the Sith

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    parts and stuff

    the pics of the crawl box looking bone dry would give me alot of cause for concern.

    how much gear oil is being put into the crawl box?
     
    tetten and hoverlover like this.
  9. Mar 25, 2020 at 12:36 PM
    #1549
    feesquivel

    feesquivel Well-Known Member

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    I wouldn't know a specific amount, I fill it up till it start dripping out of the fill hole. Then drive it around and repeat. As instructed by marlin.

    Once I fill it up this time will take note of how much it took. Also I have been using half a qt of lucas heavy duty oil stabilizer, recommended by wyatt.
     
  10. Mar 25, 2020 at 1:24 PM
    #1550
    wrmathis

    wrmathis Dark Lord of the Sith

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    pretty sure i use 1.5-2 qts. but yeah, how u explained it is how i normally add fluid.
     
  11. Mar 25, 2020 at 9:28 PM
    #1551
    Littles

    Littles Stupid is as stupid does

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    Mine measures 3.77in. They are all over the map with these things.
     
  12. Mar 25, 2020 at 10:26 PM
    #1552
    feesquivel

    feesquivel Well-Known Member

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    I guess is kind of close to the first one, every coupler I have received after the first one has been cut down to prevent “preloading”.

    Don’t know why my transmission is different from any other tacoma’s transmission that will cause preloading.
     
  13. Mar 26, 2020 at 2:44 AM
    #1553
    HomerTaco

    HomerTaco [OP] Official TW Grill Guy Vendor

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    ...................................................................................................................................................... Core-Hurst short throw shifter & T-handle / Carbon Fiber Interior / custom console light / De-badged / leather interior / Heated Front seats / Red Line Hood Struts / Painted speaker grills /one-off TRD Satoshi Grill with 12-15 front-end swap/ Pioneer AVIC-X920BT HU / Scangauge II / Black LED Tails / Dash Mount for iPad mini / Safari Snorkel / Auto-pilot mode / Leer 100XQ Cap / 4x Innovations sliders / Rear Diff Breather Mod / front windows tinted to 35% / Brute Force Fab Hybrid Front Bumper / BAMF Rear Diff Skid / Budbuilt Skids / CBI Trail Master 2.0 rear hybrid bumper / Fox rr coils/ TC UCA's/ TC spindle gussets/ TC Cam Tab gussets / Dakar leafs / Defined Engineering shackles / All pro U bolt flip / Timbren Rear Bumpstops / BAMF LCA skids / Exhaust re-route / Fog Light anytime Mod / LowRange Off Road extended rear brake lines / ATO Shackle Flip / sectioned Bushwhacker flares / re-geared to 4.56 / ARB Front & Rear Locking Diff / ARB CKMA12 compressor / PrInSu full rack system / 1" body lift / Inchworm 4.7 crawlbox / twin stick FJ t-case / Davez off-road triple-stick kit/
    Sorry to hear that. :rimshot:
     
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  14. Mar 26, 2020 at 6:35 AM
    #1554
    Littles

    Littles Stupid is as stupid does

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    Savage.
     
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  15. Mar 26, 2020 at 6:56 AM
    #1555
    Whitebutler

    Whitebutler No need to compensate!

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    Relative to what I feel like at the time.
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    So I do Hydraulic motors and pumps using jack shafts or splines couplers all the time. Seems to me the coupler should have a bit of slack when everything is bolted up tight. Maybe a few thousandths or so. I also have a tendency to use anti seize inside the coupler incase any non lubrication issues arise. just my .02
     
    G.T. likes this.
  16. Mar 26, 2020 at 8:53 AM
    #1556
    HomerTaco

    HomerTaco [OP] Official TW Grill Guy Vendor

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    Happy Birthday! :D
     
    Littles likes this.
  17. Mar 26, 2020 at 1:39 PM
    #1557
    Littles

    Littles Stupid is as stupid does

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    Thanks buddy :playball:

    e90.jpg
     
  18. Mar 26, 2020 at 1:44 PM
    #1558
    hoverlover

    hoverlover Warfin three nineteen

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    Happy birthday, @Littles
    Drinking one for ya now :cheers:

     
    TacoFMS, HomerTaco [OP] and Littles like this.
  19. Mar 26, 2020 at 8:01 PM
    #1559
    6 gearT444E

    6 gearT444E CEO & CFO @BPF

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    damn we gotta meet, quarantine and chill?
     
  20. Mar 26, 2020 at 8:05 PM
    #1560
    hoverlover

    hoverlover Warfin three nineteen

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    :rofl:
     

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