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Can I Disable 4wd

Discussion in '3rd Gen Tundras (2014-2021)' started by NateG, Mar 5, 2020.

  1. Mar 5, 2020 at 7:25 PM
    #1
    NateG

    NateG [OP] New Member

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    Ok ok before you guys tear a strip off me, hear me out.

    I bought a complete rear 10.5 third member with 4.88’s, auburn lsd, and a brand new master install kit. Bought the whole 3rd for cheap and am putting it in my truck tomorrow.

    my plan is to take the front drive shaft off (just to be safe) until I can afford and have all the parts needed to do the front.

    my question is; is there a relay or a switch or something easy I can pull instead?
     
  2. Mar 5, 2020 at 7:29 PM
    #2
    Hbjeff

    Hbjeff New Member

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    The driveshaft is definitely the safest way
     
  3. Mar 5, 2020 at 7:34 PM
    #3
    Wynnded

    Wynnded What MPG...

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    Probably a fuse, possibly for the actuator. I wonder if that would set any codes though. I'd say look for a fuse, if that sets a code or is common to additional electrical items, pulling the drive shaft would be your next best bet.
     
    Last edited: Mar 6, 2020
  4. Mar 6, 2020 at 3:39 AM
    #4
    Crunch527

    Crunch527 Brute Force and Ignorance

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    Curious why disabling the front matters?
     
  5. Mar 6, 2020 at 3:49 AM
    #5
    Wynnded

    Wynnded What MPG...

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    I would suppose that he's just trying to prevent an accidental unintended shift into 4WD.
     
    R.S.5.56 likes this.
  6. Mar 6, 2020 at 3:50 AM
    #6
    timsp8

    timsp8 Member

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    Put some tape over the 4wd knob. A lot easier and almost free.
     
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  7. Mar 6, 2020 at 3:58 AM
    #7
    WNY PAT

    WNY PAT New Member

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    Depending on how long it’s going to be before you get around to putting the system back together, I’d just pull the front shaft. If someone else ends up driving your truck or something... you never know.
     
  8. Mar 6, 2020 at 5:28 AM
    #8
    15whtrd

    15whtrd Mr. Blonde

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    Mark the driveshaft so it goes back in the same way.
     
  9. Mar 6, 2020 at 7:06 AM
    #9
    NateG

    NateG [OP] New Member

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    The different final drive I’m putting in the back (4.88) is different than the front (4.30).

    accidentally shifting it to 4wd would cause damage to either the t-case, axles, etc.
     
  10. Mar 6, 2020 at 7:23 AM
    #10
    Atomic City Tundra

    Atomic City Tundra Cam Tower Leak Addict

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    Just wait to install until you have the parts for the front.
     
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  11. Mar 6, 2020 at 7:35 AM
    #11
    ZPMAN

    ZPMAN 2nd place is the 1st looser

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    What size tires do you have?
     
  12. Mar 6, 2020 at 7:36 AM
    #12
    NewImprovedRon

    NewImprovedRon Hey! Get off my grass!

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    In the in-cab fuse box there is a 20 amp fuse, #16 on my 2015, which is for the 4-wheel drive control system.
     

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  13. Mar 6, 2020 at 7:47 AM
    #13
    BlackSheep

    BlackSheep caffeinated member

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    ^^^right here. having the parts for the rear lying around will be extra motivation for you to get the ones for the front.
     
  14. Mar 6, 2020 at 8:02 AM
    #14
    NateG

    NateG [OP] New Member

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    Thanks!
     
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  15. Mar 6, 2020 at 8:03 AM
    #15
    NateG

    NateG [OP] New Member

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    They’re a 305/70/17 (33.8”)
     
  16. Mar 6, 2020 at 8:04 AM
    #16
    NateG

    NateG [OP] New Member

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    Wanting to use 4wd again will be my motivation to do the front.
     
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  17. Mar 6, 2020 at 8:19 AM
    #17
    Jaypown

    Jaypown New Member

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    The smartest and safest ultimate route is to wait until you have all of the parts.
    If i'm putting on some different tires but only have the rears, i'm not going to put them on and avoid 4wd until i get the fronts. I'm going to have all 4 then install on the rims. Why the rush?
     
  18. Mar 6, 2020 at 8:25 AM
    #18
    NateG

    NateG [OP] New Member

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    2000 Canadian pesos to do the front, haven’t smashed my piggy bank yet.
    It’ll get done, just going to enjoy the LSD and 4.88’s now. Why not?
     
  19. Mar 6, 2020 at 8:28 AM
    #19
    Jaypown

    Jaypown New Member

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    Then go with your original plan and pull the front driveshaft
     
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  20. Mar 6, 2020 at 8:32 AM
    #20
    Cpl_Punishment

    Cpl_Punishment Mother-Loving Member

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    Banking on no more snow and ice this winter?
     
  21. Mar 6, 2020 at 8:36 AM
    #21
    NateG

    NateG [OP] New Member

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    The auburn and hakkapelitta’s should carry me through ;)
    Ground hog said early spring :fingerscrossed:
     
  22. Mar 6, 2020 at 11:01 AM
    #22
    Cpl_Punishment

    Cpl_Punishment Mother-Loving Member

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    Yeah, we don't get those in Alberta... haha
     
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  23. Mar 6, 2020 at 11:07 AM
    #23
    jewsNbrews

    jewsNbrews SSEM #8 level 3, Lab tested, Lab approved

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    Why the regear for that size tire? I could understand if 35+. Genuinely curious, as not sure if you have to regear for the LSD or what
     
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  24. Mar 6, 2020 at 11:27 AM
    #24
    15whtrd

    15whtrd Mr. Blonde

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    I recently installed 33‘s up from the stock 32s. Along with the slightly larger size, the tires are much heavier. I can definitely feel how much more sluggish the truck is. Still feels OK but definitely lost some of the pep in its step. 4.88’s would really wake it back up. I actually wouldn’t have minded the 4.88’s on stock tires. Probably would help some of the gear hunting out on the highway through the hills. On a dodge I had, I changed my gears from 3.55s to 4.10s. A lot has to do with your transmission ratios as well, but that set up felt so much better. And after it was accomplished I almost wish they were a little steeper.
     
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  25. Mar 6, 2020 at 11:46 AM
    #25
    NateG

    NateG [OP] New Member

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    For tundras and their trans ratios and from what I’ve read @dirtydeeds say, anything over 33” should be re-geared. I’m frequently carrying weight with the truck so it’s a no brainer for me.
    Just gotta muster up the cheddar cause it’s not a cheap mod.
    I’ll check back in after I finish installing tonight and have gone for a test drive.
     
  26. Mar 6, 2020 at 1:30 PM
    #26
    Black Wolf

    Black Wolf Where's my popcorn salt? Damnit

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  27. Mar 6, 2020 at 1:39 PM
    #27
    ZPMAN

    ZPMAN 2nd place is the 1st looser

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    33s I wouldn't worry about transmission problems, but living further north than me I would eather disable it with a fuse or tape (if you must install it) just in case you need it. It could be used (temporarily) as long as the road is gravel or ice but definitely a no no on tar. If you can do all the work for the front yourself it could be done for around $500 for parts.
    I would save up 500 bones and do them together on a weekend. My .02 cent's.
     
  28. Mar 6, 2020 at 1:41 PM
    #28
    e30cabrio

    e30cabrio I'm e30cabrio, I'm a modaholic

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  29. Mar 6, 2020 at 1:48 PM
    #29
    NateG

    NateG [OP] New Member

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    Didn’t say anything about potential trans problems.
    500US is ~700 CAD but still parts alone up here would be about 1000CAD
     
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  30. Mar 6, 2020 at 5:17 PM
    #30
    NateG

    NateG [OP] New Member

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    Yep. 4.88’s kick ass.
    Kind of wish I went 5.29 but for the sake of my fuel economy, I can live with this set up.
     
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