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  1. #1
    Platinum Member
    Join Date
    Nov 2001
    Posts
    889
    Location
    Green Bay, WI
    Tractor
    Kubota F2400, Kubota F2100, Farmtrac 360, Tool Cat

    Default Driving in 4WD High

    How fast (with duration) is it acceptable to drive in 4wd high while driving?

    I catch myself going 55-60 sometimes on partially snow covered roads for many miles at a time.

    I do not want to hurt the truck, and wanted some guidance.

    TIA

    Yooper Dave

  2. #2
    Elite Member George2615's Avatar
    Join Date
    Feb 2005
    Posts
    4,317
    Location
    Central Square, NY
    Tractor
    LS XR3037HC

    Default Re: Driving in 4WD High

    I don't see a problem driving at speed in 4WD on snow covered roads. When driving on clear paved roads at speed there is no need for 4WD so take it out of 4WD. Driving on clear paved roads in 4WD does cause extra wear and tear on 4WD moving parts. Most owners manuals tell you not to use 4WD on dry roads. When on dry roads in 4WD and you try to make a sharp turn you will feel the front tires try to skip. This puts excess stress on the drive axles and joints. I only use 2WD unless road conditions require 4WD use or if I feel the tires starting to break loose. Several previous trucks I've owned had manually locked hubs. In winter I would leave the hubs locked in but have the transfer case in 2 WD then if I needed 4WD I just pulled the lever into 4WD either at a stop or when coasting. My truck now has automatic hubs and electronic switching for 4WD.

  3. #3
    Platinum Member JDeerekid's Avatar
    Join Date
    Sep 2004
    Posts
    877
    Location
    P-Town, Upstate New York
    Tractor
    Montana 4340C w/Loader, JD GX345 w/54in. mower

    Default Re: Driving in 4WD High

    I second what George said. I dont usually run in 4wd unless it is needed anyway but have driven many miles with it engaged when it was needed with no problem.
    Montana 4340C w/loader, AgroTrend FU78 rear snowblower with hydraulic shute rotation, Horst 48" pallet forks, 3pt. 2-bottom plow, 6ft. bush hog rotarty cutter, 3pt. Woods 7ft back blade, 3pt. cultivator, 5ft 3pt. york rake, 6' KKII tiller, JD494 4-row planter. Future attachments: backhoe, grapple

  4. #4
    Gold Member
    Join Date
    Dec 2008
    Posts
    274
    Location
    Central Kansas
    Tractor
    B7800

    Default Re: Driving in 4WD High

    To fast for me 40 to 50 mph. My speed.Dont think it hurts drive line to go faster. Framer

  5. #5
    Veteran Member dgl24087's Avatar
    Join Date
    May 2004
    Posts
    1,398
    Location
    Va/WV
    Tractor
    1975 John Deere 1530

    Default Re: Driving in 4WD High

    I believe my Owner's manual for my Ram 1500 says max speed should be 55 in 4wd.

  6. #6
    Elite Member RonMar's Avatar
    Join Date
    May 2005
    Posts
    2,760
    Location
    Port Angeles WA
    Tractor
    Jinma 284 delivered 06/28/05

    Default Re: Driving in 4WD High

    Speed shouldn't be a problem. With manual hubs, all those drivetrain parts spin that fast when you just have the hubs locked in. I have never seen a speed restriction in any operators manual I have looked at That is why running with the hubs locked in costs you some extra fuel. You are spinning all those extra parts via the front wheels.

    AWD vehicles also have all the parts spinning all the time at highway speed without issue. The problem is as already mentioned. A regular 4X4 has no differental between front and rear axles. A hard dry surface that dosn't allow some wheel slip will cause a binding in the drivetrain that can result in severe gearbox/transfer case damage. AWD drivetrains get around this problem by adding another differential or a slip clutch mechanism between the front and rear axles to relieve this stress. This is the same as the axle differential relieves the stress of the outside wheel wanting to turn faster than the inside wheel when going around a corner.
    Ron

  7. #7
    Bronze Member
    Join Date
    Sep 2008
    Posts
    78
    Location
    Grovedale, Alberta
    Tractor
    Massey 275, JD 6715

    Default Re: Driving in 4WD High

    What make model and year is your truck?

  8. #8
    Platinum Member WH401's Avatar
    Join Date
    Mar 2008
    Posts
    881
    Location
    Southern Maryland

    Default Re: Driving in 4WD High

    Recently we had enough snow here to cover the roads with about 3 inches and I drove the 92' in 4 High at about 40 - 50 without any problems. Definitely don't drive it in 4 high when the roads are dry though, you'll cause damage.

    The 06 has automatic locking hubs so all the front drive line parts are always turning constantly when going down the road, no matter whether your in 4 wheel or not. I plan to put manual locking hubs on it in the future to cut down on fuel usage and drive line wear, worst thing they ever did was get rid of them from the factory.
    2006 JD 3320 PowrReverser w/ 300cx Loader, 61" HD Bucket w/ Toothbar, Horst Fixed Forks, IMatch, Ballast Box, Filled R4's, Vertical Exhaust, Warning Light Brush Guards, Auxiliary Forward Lighting Kit, Rear Work Light, 68" Ratchet Rake, & a Woods PRD7200 Finish Mower
    2004 JD Gator 6x4
    67' Gravely L8
    69' Gravely 432
    75' Gravely 810
    77' Gravely Professional 5460
    81' Gravely 8173-KT
    99' Gravely 20-G
    06' Ram 3500 DRW 4x4 5.9 Cummins

  9. #9
    Platinum Member farmboy12's Avatar
    Join Date
    Feb 2008
    Posts
    892
    Location
    Benedict, MD
    Tractor
    Kubota M4900 FEL; New Holland TC30 MMM; Ford 1620; Ford 1520 MMM; John Deere X740; John Deere 455 MMM; Craftsman 19.5hp;;;;; Antiques: 1946 John Deere B; 1951 John Deere MT; 1952 Allis Chalmers B; 1967 International 140

    Default Re: Driving in 4WD High

    WH401-
    Where are you at in So. MD to get that much snow?! Most we've had at all this year was maybe 1-1/2". Only 3-4 snowfalls!


    Kyle

  10. #10
    Platinum Member WH401's Avatar
    Join Date
    Mar 2008
    Posts
    881
    Location
    Southern Maryland

    Default Re: Driving in 4WD High

    Quote Originally Posted by farmboy12 View Post
    WH401-
    Where are you at in So. MD to get that much snow?! Most we've had at all this year was maybe 1-1/2". Only 3-4 snowfalls!


    Kyle
    It was that storm on the 21st of January, it gave La Plata about 3 - 3.5 inches. The storm ended up going father south than the weathermen first expected so we got more snow then most. County wasn't prepared at all and hadn't done anything to the roads, with no salt they were quickly covered up with accumulation. There were numerous school bus and automobile accidents that morning. The county ended up closing schools early that day and schools were again closed the next day.
    2006 JD 3320 PowrReverser w/ 300cx Loader, 61" HD Bucket w/ Toothbar, Horst Fixed Forks, IMatch, Ballast Box, Filled R4's, Vertical Exhaust, Warning Light Brush Guards, Auxiliary Forward Lighting Kit, Rear Work Light, 68" Ratchet Rake, & a Woods PRD7200 Finish Mower
    2004 JD Gator 6x4
    67' Gravely L8
    69' Gravely 432
    75' Gravely 810
    77' Gravely Professional 5460
    81' Gravely 8173-KT
    99' Gravely 20-G
    06' Ram 3500 DRW 4x4 5.9 Cummins

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