Dismiss Notice

Welcome To CK5!

Registering is free and easy! Hope to see you on the forums soon.

Score a FREE t-shirt and membership sticker when you sign up for a Premium Membership and choose the recurring plan.

shift into 4wd without stopping forward motion. anyone crazy enough to try it.

Discussion in 'The Garage' started by vortec, Dec 6, 2006.

  1. vortec

    vortec 1/2 ton status

    Joined:
    Jul 22, 2004
    Posts:
    1,472
    Likes Received:
    0
    Location:
    fort worth, texas
    so, has anyone here tried shifting into 4wd while in forward motion on the street? maybe around 40+mph? i'm not saying i plan to. i'm just curious if it would actually engage at that speed, and if it would break stuff all to hell.
     
  2. gmc4cw

    gmc4cw 1/2 ton status GMOTM Winner

    Joined:
    Jul 19, 2006
    Posts:
    3,907
    Likes Received:
    0
    Location:
    west chester, Pa
    I know I can do it with a 208 T-case. You have to let off the gas. Its a neutral torque setup.

    But the real question is "Why the hell would you shift in to 4 wheel at that speed?"
     
  3. Can Can

    Can Can Pusher Man Staff Member Super Moderator

    Joined:
    Feb 17, 2000
    Posts:
    15,552
    Likes Received:
    136
    Location:
    Cochrane, Alberta, Canada
    I shift my 208 into 4HI at speeds of up to 35 MPH all the time......
     
  4. Chevy305

    Chevy305 6 Lug 14bsf Status Premium Member GMOTM Winner

    Joined:
    Jan 23, 2006
    Posts:
    11,228
    Likes Received:
    485
    Location:
    New Hampshire
    My friend did that on his 97 Dakota and it sarted making all sorts of grinding and popping noises. Not good


    But as long as you don't go to 4lo you should be fine.
     
  5. Thunder

    Thunder 3/4 ton status

    Joined:
    Jul 20, 2000
    Posts:
    8,946
    Likes Received:
    1
    Location:
    Northeast Nevada
    I do it all the time but I have a NP241 Xfer. I can shift in and out of hi range 4x4 at most any speed. As said you can do it wiuth 208 too.
    Acually if you work on letting off the gas. and pull the lever at the right rpm you can do it with most any xfer case but it takes some practice with some. Knowing how to double clutch helps.
     
  6. 85mudblazin

    85mudblazin 1/2 ton status

    Joined:
    Mar 26, 2004
    Posts:
    3,951
    Likes Received:
    0
    Location:
    Austin,TX
    When I was in highschool and DD the K5 I could beat just about ANY car at my school off the line.
    Thats with a crate 350, 35" tires, 700r4, and 5.13 gears:D

    Id start out in 4wd to keep the tire spin to a minimum, then shift into 2hi for the finial climb to 6k:D
     
  7. muddysub

    muddysub 1 ton suburban status Staff Member Moderator GMOTM Winner

    Joined:
    Jun 23, 2001
    Posts:
    10,451
    Likes Received:
    489
    Location:
    my garage, Henderson, NV
    ive done it under 20mph quite often.
     
  8. big dan

    big dan 1/2 ton status Premium Member

    Joined:
    Aug 1, 2005
    Posts:
    2,656
    Likes Received:
    29
    Location:
    Arkansas
    make sure your hubs are locked in when you do it. Ive done it many times before, maybe not that fast but driving through a field just before we would get to a slick spot let off the gas and yank it in.
     
  9. mike reeh

    mike reeh 1/2 ton status

    Joined:
    Jul 23, 2001
    Posts:
    752
    Likes Received:
    0
    Location:
    San Diego, CA
    well theres a difference between shifting into 4WD, and shifting into LOW RANGE...

    any transfer case will let you got from 2 <-> 4 on the fly if the hubs are locked.... I do it all the time on pavement at 60mph+ with a np205..

    range changes on the other hand.................................
     
  10. pauly383

    pauly383 Daddy383 Staff Member Moderator

    Joined:
    Jul 22, 2001
    Posts:
    16,217
    Likes Received:
    1
    Location:
    Mesa , Arizona USA
    The aluminum cases are synchroed for hi range , but low range is a no no .
     
  11. 87BrnRsd

    87BrnRsd 1/2 ton status

    Joined:
    Apr 21, 2003
    Posts:
    2,457
    Likes Received:
    0
    Location:
    Boone, North Carolina
    I always stop when I put mine in 4wd. Than again I have to get out to lock the manual hubs.....
    -Harrison
     
  12. Cajun4x4

    Cajun4x4 1/2 ton status

    Joined:
    Oct 17, 2005
    Posts:
    889
    Likes Received:
    0
    Location:
    Lafayette, LA
    did it at 55... still in one peice :wink1:
     
  13. hunterguy86

    hunterguy86 1/2 ton status

    Joined:
    Jan 10, 2005
    Posts:
    2,477
    Likes Received:
    0
    Location:
    San Marcos, Texas

    x2. I do the same when we are just playing in slick top mud. Run it in 2wd and if I bog down I pop it in. Now if its real mud I just go 4wd all the way.
     
  14. Chrisblazzer89

    Chrisblazzer89 1/2 ton status

    Joined:
    Oct 12, 2006
    Posts:
    1,966
    Likes Received:
    0
    Location:
    Massachusetts 02301
    With my DD i just pop it into 4hi no problem at high speed but never gone over 30 wen doing it. 4lo i stop put it in nutral then 4lo then drive bam all good.
     
  15. goldwing2000

    goldwing2000 Guest

    x2 As long as the hubs are locked in (and you're not on dry pavement! :eek1: ), it's no big deal.

    If I'm driving on partially snow-covered roads, I'm in and out of 4wd all the time.
     
  16. vortec

    vortec 1/2 ton status

    Joined:
    Jul 22, 2004
    Posts:
    1,472
    Likes Received:
    0
    Location:
    fort worth, texas
    yeah, i never planned on slapping it into 4low at cruising speeds. however, the reason i originally made the post is that we've had some icy weather, here (not much), and i hit a big patch of black ice, on a road that sloped heavily to the right. to get little more control, i went into 4hi by going neutral/4hi/drive. now i know i could have just plopped it straight into 4hi. good info to have for the 2 days a year that we have ice here. :haha:
     
  17. beater_k20

    beater_k20 Banned

    Joined:
    Dec 9, 2003
    Posts:
    10,276
    Likes Received:
    0
    Location:
    Elkhart, IN
    i've seen 2 come apart at highway speed, but they were in S-blazers, so probably a different transfer case altogether.
     
  18. PeteH

    PeteH 1/2 ton status

    Joined:
    Mar 26, 2003
    Posts:
    498
    Likes Received:
    0
    Location:
    San Jose
    is there a way to make it so you can safely do it 2wd to 4wd at high speeds from in cab? some short course trucks(i think prolite trucks) engage 4wd in corners and then 2wd all the rest of the course(i think)
     
  19. 3 on the tree

    3 on the tree 1/2 ton status

    Joined:
    Oct 16, 2004
    Posts:
    3,970
    Likes Received:
    0
    Location:
    gunnison colorado
    The owners manual for my 70K5 says you can go to 4H at any speed. However, I challenge anyone to shift a D20 T case to 4 H and still keep it on the road(damn J shift pattern).

    The manual also says not to engage 4 wd when the rear tires are spinning faster than the front tires.
     
  20. MTMike

    MTMike 1/2 ton status

    Joined:
    Feb 10, 2005
    Posts:
    2,992
    Likes Received:
    0
    Location:
    Billings, Montana
    High range is a no brainer - I've done it at 60+ with every 4WD I've ever driven.... ones with 203's, 205s, 208s, whatever was in our old '96 1/2 ton Chevy and whatever is in my '05 Dodge 3500

    Low range you should come to a complete stop and put your tranny into neutral first.

    Mike
     

Share This Page