1. Welcome to 4Runners.com!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all 4Runner discussion topics
    • Transfer over your build thread from a different forum to this one
    • Communicate privately with other 4Runner owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Marlin Crawler Tacobox

Discussion in '5th Gen 4Runners (2010-2024)' started by bigdaddy2021, Jan 21, 2023.

  1. Jan 21, 2023 at 3:07 AM
    #1
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    Just wanted to fire up a discussion thread and provide some basic info about this mod for our 5th gens.

    I, for one, am not satisfied with 33:1, having been wheeling in anza-borrego, Pismo and Moab already with our 2019 TRD OR. I think the key to drivetrain durability in rough, rocky terrain is the ability to ease or crawl your way through it. Also, 33:1 down some of the steep parts of Moab trails was a bit too spicy for our tastes.
     
    Last edited: Jan 21, 2023
    Trail Runnah likes this.
  2. Jan 21, 2023 at 11:37 AM
    #2
    nova

    nova New Member

    Joined:
    Aug 26, 2022
    Member:
    #28359
    Messages:
    74
    Gender:
    Male
    First Name:
    mike
    Vehicle:
    slightly modified LE
    @RFB has done it. I saw a rig walk around by Cruising the Land and noticed that Richie had a well integrated lever setup. Maybe he’ll chime in to discuss the TB and how it was done.

    Cheers
    Mike
     
    bigdaddy2021[OP] likes this.
  3. Jan 21, 2023 at 11:51 AM
    #3
    Nano909

    Nano909 New Member

    Joined:
    Aug 5, 2022
    Member:
    #28090
    Messages:
    342
    Gender:
    Male


    Judging by those places, you're not doing heavy wheeling or anything that justifies having a low low gear.
     
  4. Jan 21, 2023 at 12:41 PM
    #4
    McSpazatron

    McSpazatron New Member

    Joined:
    Feb 16, 2021
    Member:
    #19810
    Messages:
    2,838
    Gender:
    Male
    Vehicle:
    2021 4runner OR
    Dobinson IMS Warn Bumper CaliRaised Sliders 265/70 K02s
    There’s a guy in our group that put one on his tacoma. It’s pretty neat. Most of the trails around us are doable by stock trucks if you use the easy bypasses. But, he has no problems finding spots to use it when we go on trail rides lol
     
    bigdaddy2021[OP] likes this.
  5. Jan 21, 2023 at 5:14 PM
    #5
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    Here's some info on the TacoBox, if you're not familiar.

    Crawl ratio Calculator

    Marlin Crawler.com > Dual Case > Determine your Crawl Ratio

    With our 3.73's we go from 33:1 to 157:1 in Low-Low

    Built units currently available
    TacoBox | Marlin Crawler, Inc.


    From Marlin's site:

    We have gathered a few dozen core t/cases to bring back fully-built TacoBox Dual Case Units for a limited time!!

    These TacoBox Units are built using adapters from our sister brand, Inchworm, and feature our Marlin Crawler 4.70:1 Low Range Gear Set, Marlin Crawler Double Roll bearing, Marlin Crawler 52% stronger HD Lower Cage Bearing, Marlin Crawler Dished Coupler, Marlin Crawler EcoSeal, Refurbished Toyota Shift Handles, Marlin Crawler Shift Knob, High Quality JIS Hardware, and everything needed to bolt into your rig! Hand-built in-house and ready for installation!

    What is the TacoBox?
    The TacoBox is a compact reduction unit based on the famous 28-year time-proven Marlin Crawler Dual Case 'Crawl Box' design and is inserted between your transmission and transfer case. To achieve this, front & rear adapters are used to convert the bolt patterns of both your transmission and transfer case. The front adapter is based on our 25% stronger 5/8" thick USA-made Billet Aluminum Adapter to mate a Marlin Crawler Reduction Housing behind your 23- or 26-spline automatic or manual transmission. The rear adapter is based on our 6th generation USA-made Billet Aluminum MC09 Adapter which bolts to your original transfer case, and is fully clockable in 5° increments. The result is the Marlin Crawler TacoBox™, a fully assembled Dual Case Unit ready to be installed into 1995 and newer Toyota and Lexus 4WD drive trains.
     
  6. Jan 21, 2023 at 5:19 PM
    #6
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    I agree to an extent - we were able to cruise around Pismo/Anza where momentum and wheel speed are key, but definitely didn't try some of the rockier trails out in ABSP. Moab is a different story. Arches NP was fine with 2.5" lift and 32's, but on Fins and Things we definitely would have welcomed more reduction, not to mention all the more difficult trails we didn't try that would have been made more achievable with a lower crawl ratio.

    Also, that was just our first year of wheeling with this rig. We have tougher trails in our sights in the Big Bear and Lake Tahoe areas. Also, might plan some backcountry exploring/fly fishing in AZ where extra control on some narrow shelf roads is a good thing.
     
    Last edited: Jan 21, 2023
    Trail Runnah likes this.
  7. Jan 21, 2023 at 5:21 PM
    #7
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    Yeah, the Lever install is one of the only custom parts of the install, from what I gather, everything else is pretty cut and dry. Love to see some center console pics if he's so inclined.
     
  8. Jan 21, 2023 at 5:28 PM
    #8
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    Here's what to expect from a 5th gen install (FJ cruisers and Taco's might be different):

    1. Disconnect front and rear driveshafts
    2. Disassemble center console, remove shifters as needed.
    3. disconnect and remove tcase,
    4. assemble Tacobox and fill with appropriate oil and install on Transmission
    4.5 extend vacuum lines and plug harness to reach Tcase's new position
    5. locate/create hole for shifter in center console - custom bend shifters to poke up where you want them. create or install shifter boot.
    6. measure for and shorten/lengthen front and rear driveshafts.
    7. Modify skid plates for new location of transfer case. Rear lip of belly skids probably need to be trimmed.
    7.5 Possibly reinforce tcase mounting system for longer setup
    8. Install new shafts, top off fluids, function test
     
  9. Jan 21, 2023 at 5:30 PM
    #9
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    What I like about the TacoBox option:

    • 100% bolt on with minimal mods other than extending vacuum lines and wiring harness. Tacobox's are built for Tacoma's, FJ's and 4runners.
    • ATRAC Leaves ATRAC/MTS and stock t-case intact and functional
    • Shifting: shifter is 100% mechanical and direct to the box.
    • Allows for a wide range of gearing options:
    2wd Hi (13:1) (normal daily driving)
    2wd /Crawler Low-3rd gear (24.5:1)
    2wd /Crawler Low- 2nd gear (35:1)
    2wd /Crawler Low -1st gear (61:1)

    4wd hi/ Crawler Low-3rd gear (24.5:1)
    4wd hi/ Crawler Low- 2nd gear (35:1)
    4wd hi/ Crawler Low -1st gear (61:1)
    4wd Low/ Crawler Low - 3rd gear (63:1)
    4wd Low/ Crawler Low - 2nd gear (90:1)
    4wd Low/ Crawler Low - 1st gear (157:1)


     
  10. Jan 21, 2023 at 5:41 PM
    #10
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    This is a great calculator, btw, to do some armchair modifications of your rig and to see what you'd end up with ratio/rpm-wise.
    Gear Ratio Calculator (grimmjeeper.com)

    After a few weeks of imputing different options, I came to some big realizations:

    1. 4.56's and 4.88's are a good option, but don't get me where I want to be crawl ratio-wise and really mess with your street-ability. We really like how our 4runner road-trips and don't want to mess with what works.
    2. In terms of RPM's, 4.56's aren't really required until you go to a true 35" tire. 3.73's seem to do fine for 285/70-17's and 285/75-17's (33's and 34's, respectively)
    3. Also, cost vs benefit was way off when quoted for the install by a few shops.

    For us, sticking with 33's and 3.73's was a big discussion, but an easy decision. no major mods to fit them, no major change to drivability, reduced tire cost, and more availability since 285/70 and 285/75 are common sizes. If we want to go a bit bigger later, we can, but we'd like to learn how to drive our rig on the 285/70's for the time being.
     
  11. Jan 21, 2023 at 6:10 PM
    #11
    Nano909

    Nano909 New Member

    Joined:
    Aug 5, 2022
    Member:
    #28090
    Messages:
    342
    Gender:
    Male




    Sounds like you're planning ahead, I like it. I suggest regearing to 4.88 before you do dual cases. You'll find that extra gearing in 4lo to be quite useful. My friend in a stockish TRD Pro on 33's has done almost every hard trail in Big Bear, he struggled a bit in some places but overall it did quite well.
     
  12. Jan 21, 2023 at 10:37 PM
    #12
    nova

    nova New Member

    Joined:
    Aug 26, 2022
    Member:
    #28359
    Messages:
    74
    Gender:
    Male
    First Name:
    mike
    Vehicle:
    slightly modified LE
    I’m running 4.88 on 35” tires. I feel I’m just a bit short with them but I appreciate the range off road. Taco box isn’t on my roadmap ATM, but I’d eagerly follow any 5th Gen build thread when the TB is part of it!
     
    bigdaddy2021[OP] likes this.
  13. Jan 22, 2023 at 7:51 PM
    #13
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    Well, hop on board then, cuz our 2019 TRD OR is Tacobox equipped. :)
     
  14. Jan 22, 2023 at 7:58 PM
    #14
    Nano909

    Nano909 New Member

    Joined:
    Aug 5, 2022
    Member:
    #28090
    Messages:
    342
    Gender:
    Male

    Was that before or after you made this thread? Lol
     
  15. Jan 22, 2023 at 8:54 PM
    #15
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male

    It’s a very new mod…have had a ton of interest, so i thought i’d share.
     
    Nano909[QUOTED] likes this.
  16. Jan 22, 2023 at 9:53 PM
    #16
    Nano909

    Nano909 New Member

    Joined:
    Aug 5, 2022
    Member:
    #28090
    Messages:
    342
    Gender:
    Male


    Well post pics sir.
     
  17. Jan 22, 2023 at 11:27 PM
    #17
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    Console install
    AA43AB76-E1B2-49EA-94E4-189E70494C8D.jpg
     
    Nano909 and Trail Runnah like this.
  18. Jan 22, 2023 at 11:28 PM
    #18
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    New tcase location and trimmed skid plate.

    AC781274-FF0A-4F1D-BF58-A7EE0E9700D6.jpg
     
  19. Jan 22, 2023 at 11:33 PM
    #19
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    few more shots

    tacobox installed
    2261F7BD-E8EB-4EBE-98E8-6B974BE01CFA.jpg

    gas tank clearance
    0173AD6B-F7F5-459E-BAA5-BCAF18727C79.jpg
     
  20. Jan 22, 2023 at 11:39 PM
    #20
    bigdaddy2021

    bigdaddy2021 [OP] New Member

    Joined:
    Aug 15, 2021
    Member:
    #22834
    Messages:
    25
    Gender:
    Male
    this positioning works great for us, though, like I said, i’d love to see other solutions.

    It leaves both cupholders intact, and finally makes use of the slot in front of the pass. side cupholder that we never did use…
    3B135F3E-FD0D-490E-A1E4-32CA606CFB3E.jpg
     
    Nano909 likes this.
  21. Jan 23, 2023 at 12:58 PM
    #21
    Nano909

    Nano909 New Member

    Joined:
    Aug 5, 2022
    Member:
    #28090
    Messages:
    342
    Gender:
    Male
    Wow, and it doesn't take that much room. Very clean install. You can still use both cupholders.
     
  22. Jan 23, 2023 at 1:19 PM
    #22
    RFB

    RFB New Member

    Joined:
    Feb 2, 2022
    Member:
    #25469
    Messages:
    178
    Gender:
    Male
    First Name:
    Jailbreak
    Vehicle:
    2019 trd pro
    metaltech slider, front bumper 4 in lift UCA/LCA panhard
    Ok i may as well chime in I went a different route with shifter install on my tacobox. I hit up northwest fab in canada and they sent me the trident which allows independent 4lo 2 lo and of course 4wd 2 wd. and redline goods is custom stitching the 3 way boot. well worth it JMO BTW heres a recent pic of build as it stands DANA 60 is going in tomorrow at eastcoastgearsupply in NC
    shes on a 3 in lift
    magnuson supercharged
    dual lithium aux batteries
    alucab up top
    c4 in rear
    metaltech all around
    dobinson underneath
    powerbrakes up front
    powerstop in rear
    total choas plus 2 LT
    BFGKM3 37s all around
    scs 17in wheels
    heres a walkaround video if interested https://www.youtube.com/watch?v=ZVf_MJkZWI8&t=3s351A4123.jpg 351A4126.jpg 351A4120.jpg 351A4122.jpg

    goods 351A4123.jpg 351A4123.jpg 351A4126.jpg
     
  23. Jan 23, 2023 at 1:20 PM
    #23
    RFB

    RFB New Member

    Joined:
    Feb 2, 2022
    Member:
    #25469
    Messages:
    178
    Gender:
    Male
    First Name:
    Jailbreak
    Vehicle:
    2019 trd pro
    metaltech slider, front bumper 4 in lift UCA/LCA panhard
    bought this truck bone stock in feb 2022 ripped it down in my driveway in the winter 2 months later hit the road and have been rolling ever since.
     

Products Discussed in

To Top