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4 Wheel High Speed Limit - Ford Truck Enthusiasts Forums
12-09-2003, 09:06 AM
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4 Wheel High Speed Limit
Is there a recommended speed limit in 4High?
Got our first snow with my new truck....needed 4wd to get home last night and to get to pond this morning. Can I hurt anything going too fast in 4high?
as told in other threads...this is my first 4wd ever so please don't make fun! lol
thanks guys.
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12-09-2003, 09:43 AM
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if it's treacherous enough for 4 wheel drive, i would think it is bad enough to go SLOW... getting up to speed in bad conditions is not nearly as much of an issue as stopping !

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12-09-2003, 10:18 AM
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Don't know if there is an official limit. But like the other guy said, usually if you need 4WD, you probably shouldn't be going fast.
However, on some days when I need to commute and the road condition changes a lot. I have had it in 4WD going as fast as maybe 65mph for a few miles on wet pavement. When I hit snow, of course the speed drops a lot.
I also think I have driven at 55 for longer periods, maybe 20-30 miles or more at a time.
Jim Henderson
12-09-2003, 10:48 AM
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yeah...sorry, question was misleading...what I meant was:
When the conditions are really bad...i drive slow of course, but what about when there are periods of road that are pretty good.....I really don't want to stop, put it in neutral and take it out of 4wd......so is it okay to drive at speed?
Thanks
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12-09-2003, 11:01 AM
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Just be careful when turning while going forward or backwards as the front end jumps and wants to go straight becuse the wheels are being driven. This happens mostly in 4wd low but I have experienced it in 4wd high on this truck more than any other 4x4 I have owned. Which by the way includes a '74 jeep CJ-5 with a 304 AMC V8 with true duals and a big Holly/Motorcraft double pumper (gawd i miss that baby, 7mpg in 4wd and a 12 gal tank it would take a vette off the line but lost it before a 1/4 mile) an '86 F150and a 97 F150

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12-09-2003, 11:32 AM
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You don't have to to stop, put it in neutral and take it out of 4wdHI. That manuver is for 4LO only.
I have manual hubs & manual shift transfer case. When the conditions are bad I lock the hubs & switch between 2wd & 4HI as needed.

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Last edited by farmwheels; 12-09-2003 at 11:45 AM.
12-09-2003, 11:43 AM
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I've run highway speeds very often in four wheel drive in all types of vehicles. This was usually on the real cold "sticky" type snow. You can decide what's safe for you.
I wouldn't advise running with the hubs locked and the transfer case in 4 high for any length of time on a hard surface where the chance of wheel slippage is minimal. You're going to end up with some degree of driveline wrap-up which possibly will break something or at the very least wear out your u-joints prematurely.
With my stick shifted 4wd, I leave the hubs locked and just shift on the fly between 2 and 4 wheel when I hit those scary spots.
Do you have electronically shifted 4wd, if so, is that the procedure, that you have to stop to disengage the transfer case? I've never had a vehicle with the electronic shift, but I would be surprised if you couldn't shift on the fly.
Jade97 you beat me to it. I got a phone call in the middle of my typing the post.

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12-09-2003, 12:05 PM
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Sprinkler, I would recommend using the 4x just for getting moving. Unless you are in very hilly terrain, or lots of tight corners with mud or snow. Once you are moving on pavement, you should shift back to 2x high. Four wheel doesn't help you turn or stop, so why subject the equipment to wear, and use the extra fuel?
12-09-2003, 12:36 PM
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Even with the electronic 4wd...shift on the fly is okay in 4hi?
In my wife's Yukon it is okay....wasn't sure about the ford
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12-09-2003, 12:38 PM
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Quote:
Originally posted by camo4stealthSprinkler, I would recommend using the 4x just for getting moving. Unless you are in very hilly terrain, or lots of tight corners with mud or snow. Once you are moving on pavement, you should shift back to 2x high. Four wheel doesn't help you turn or stop, so why subject the equipment to wear, and use the extra fuel? I don't want to start an argument but 4x does help you turn. It actually helps a ton on slippery surfaces.
When in 4x the rear tires are not getting the full power becasue some is being routed to the front. Also, the front tires help to pull the front around the corner instead of trying to go straight. These two things help keep the rear end from sliding around.

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12-09-2003, 12:40 PM
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Quote:
Originally posted by sprinklerguyEven with the electronic 4wd...shift on the fly is okay in 4hi?
In my wife's Yukon it is okay....wasn't sure about the ford
You can shift on the fly with electronic or manual in to 4x hi as long as you are below 55mph.
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12-09-2003, 12:54 PM
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Mwachel, in mud, 4x4 definitely helps you turn. In snow? That's debateable. It will pull the front end around, but nail it and break them loose, and there will be no steering at all. So that is a two way thing, so to speak. At cruising speeds (above 35 or so) the front wheel drive assistance should not be needed. Using discretion would be much more advisable. I think.
12-09-2003, 01:00 PM
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Re: 4 Wheel High Speed Limit

Quote:
Originally posted by sprinklerguyCan I hurt anything going too fast in 4high? Your bank account! Other than that; no. But with either a lever or a switch, there is no need. Just switch it to 2WD. Even with the hubs locked you won't hurt anything.
Quote:
posted by FarmwheelsI wouldn't advise running with the hubs locked and the transfer case in 4 high for any length of time on a hard surface where the chance of wheel slippage is minimal. You're going to end up with some degree of driveline wrap-up which possibly will break something or at the very least wear out your u-joints prematurely. FWIW, Dodge trucks, with their straight AAM axles, have their hubs locked all the time with no ill effects on the U-joints. Ours cannot be that much different.
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12-09-2003, 01:44 PM
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Monsta,
I guess I should have been more succinct. I was trying to emphasize the need to avoid driving on a hard surface with the rear and front axles locked together (via the transfer case in 4 wheel drive) unless you have some kind of differential like a Subaru or other AWD vehicle has - which my truck doesn't. My point was that if you get a wrap-up problem that one of the first places that you could see it would be the u-joints. Sheesh.
You're right that just keeping the hubs locked in all the time would result only in negligible wear on the u-joints (and other front drive components) but I'm not going to try to quantify that.
Hey, wait a second, you moved to Hawaii, are you keeping up with snow driving technique in case you have to come back? Is that why you checked this thread out?
That other truck you talked about, a Dodge is it (do they make a truck)? Is that a current application or was that something in the past? Man, that would kill fuel mileage turning all those components back to the transfer case.

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12-09-2003, 06:16 PM
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I have also driven with the hubs locked but in 2WD. I have done this for perhaps 200 miles at 65 or better, many times. makes a bit more noise but it is handy for when you have to shift in and out of 4WD.
If you need to get into 4WD with manual hubs, I just slow down to about 30 and shift into neutral(works easier I think) and then stick it in 4H.
I have driven in 4H on crowned roads with snow and the front end being driven definitely helps. I have gone down that type road kinda crab like, ie the truck was slightly sideways. I know probably not a bright idea driving if it was that bad, but I do know the truck handled just fine.
The key in snow is always be gentle on all inputs, power, steering braking etc. Otherwise you can get sideways. I am a poor ol California boy transplanted to Oregon with occasional snow. So I always go slow when I hit too much snow and ice and I have a very gentle touch on the gas and brakes etc, so I almost never have a problem getting around in snow and ice, even with 2WD, unless I get in a hurry.
Just last week I towed my 30 foot trailer thru about 1 foot deep snow, with ruts, I was in 4H. When I came to a relatively tight turn off(<90degrees), where I wanted to go, the trailer pushed the truck pretty badly even at walking speed and I don't think I could have made the turn unless I shifted to 4L. Once in 4L I had much better control and steering. My kids thought it was great, but I left pucker marks on the seat, what a dummy, hauling a trailer in snow just for fun. Still the truck worked great.
Just my experience.
Jim Henderson
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Top speed in 4 wheel drive? - F150online Forums
The manual states that when shifting from 2wd to 4wd you can do so at any speed up to 55 mph.
The manual does not state a specific max speed while in 4wd.
Usually your terrian will dictate that.
I've driven at 80+ on dirt roads with no problem. If you have a nice beach to run, the only limitation is your own ability, the shocks, tires and suspension. Just as fast in 4wd as 2wd.
Engaging 4wd will pull some power because of the extra drag on the drive train, so you may not have the same top speed ability. Usually if you are on a surface that you can run 80+, you should be able to do it in 2wd anyway.
I also have a scar on the forehead from a high speed run in the dunes that did not go well.
So be careful.
2012 F150 "2-speed Automatic 4WD System" - Ford F150 Forum ...
The new 2012 F150 order guide is cool to look through, and while I saw several changes of what options you can get on different models (cooled seats on FX4, big gas tanks, bold new colors, black wheels, etc.), and some upgrades to towing/hauling capacities, I didn't see much that was brand new and notable.
Except this:

----------------------------------------------------------------------2-speed Automatic 4WD System (1)

• Optimizes traction by transferring power to the appropriate wheels when needed• The system provides four available modes of operation and is activated by using a rotary switch on the instrument panel
2H (HIGH)
• Vehicle operates as a rear-wheel-drive vehiclewhen 2H is engaged• Helps vehicle provide optimal fuel economy
4A (Automatic Four-Wheel Drive)
• Set-and-forget function provides four-wheel-drive capabilities when needed• Under normal road conditions, most power is sent to the rear wheels• As road conditions require, engine torque is sent to the front and/or rear wheels to help maintain optimum traction• Setting is appropriate for any driving, whether on dry pavement or in adverse conditions
4H (HIGH)
• Setting provides electronically locked four-wheel- drive power to both the front and rear wheels for use at normal speeds on low-traction surfaces• Intended for use only in severe weather and off- road conditions including snow, ice, sand or mud• Setting should never be used on dry pavement
4L (LOW)
• Setting provides four-wheel drive with full power to both the front and rear wheels and includesa lower gear reduction ratio for increased torque multiplication to all four wheels• Intended only for off-road applications that require extra power including deep sand, steep grades or when launching or pulling a boat out of water• Setting should never be used on dry pavement
(1) Include on Lariat 4x4 models and above. July 2011.
----------------------------------------------------------------------
Not having a full-time AWD system (without sacrificing the two-speed transfer case) was one of the biggest shortcomings of the F150 for my needs when I was looking. In the Colorado mountains, it's very typical to be in an icy corner one second and on bone-dry pavement the next, and neither 2H or 4H is ideal for these conditions... 4A, if well implemented, would be perfect.
So any speculation on how this is implemented? Brand new transfer case? A computer rapidly engaging/disengaging the existing transfer case based on sensors?
Also, the footnote would imply that it is not available on FX4 models (MAJOR bummer!), and that it is already out on late 2011 Lariats???
Has anybody seen or own a late production 2011 Lariat with a 2-speed automatic 4WD system?
Last edited by pfbz; 08-25-2011 at 08:45 PM.
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The 2015 Mecum Auctions in Denver

08/25/15, via Automobile

As World War II was winding down, Ford formed the Lincoln-Mercury division ... This one-owner example with four-wheel drive, rare five-speed manual transmission, and Eddie Bauer trim was a bargain. But keep in mind that this later Bronco (based on 1986 ...
2016 Ford Edge confirmed with expected £30,000 price tag

08/25/15, via The Chronicle

Ford ... speed manual box and puts out 149g/km of CO2. If you want more, the range-topper will give you 207bhp and 332lb ft. Driving through a six-speed dual-clutch auto, it will be barely less clean at 159g/km. Both vehicles will offer four-wheel drive ...
Ford F-150 Raptor Prototype Testing Video

08/25/15, via Automoblog.net

... mechanical-locking four-wheel drive. Similar to the 2015 Ford F-150, the new Raptor is subject to a weight reduction and upgraded high-strength steel frame. The 2017 Ford F-150 Raptor will be built at the Dearborn Truck Plant and go on sale Fall 2016.
Watch Ford test new Raptor F-150 in rugged Northern Michigan

08/24/15, via MLive

of torque, and will come equipped with a 10-speed transmission with manual ... The truck also features with an all-new, four-wheel-drive torque-on-demand transfer case. Pricing for the 2017 Ford F-150 Raptor has not yet been released.
'Drive Out Cancer' Mustang appearances

08/24/15, via Daily Item

The ‘Drive Out Cancer’ Mustang, donated by Selinsgrove Ford, continues to travel Pennsylvania roads ... 6, 8 a.m. to 2 p.m., Watsontown Flea Market, Carpenter Road, Milton Sept. 13, 1 to 4 p.m., The Wheel, Route 14, Roaring Branch for a car show ...
2015 Ford F-150: Still at the top of its game

08/24/15, via Examiner

It's a bit tempting to wonder whether designers at Ford get nervous every time ... All of the engines are linked to a six-speed automatic transmission and drivetrains are rear-wheel or four-wheel. The F-150 starts at about $27,000 and ranges to around ...