ozman3918

I forgot to take it out of 4 wheel drive and hit speed of around 70 mph.It seems fine but was wondering if I could have done damage? Highway was dry.Also I have electronic switch in dash to engage

natstayl

That is pretty fast, must have had it in 4Hi. Minimal chance of damage. If there was damage to metal you would know immediately. Maybe took a few miles off the tires, due to the ratio differences front to rear when engaged. I'm surprised you couldn't feel the torque-steer through the steering wheel when you turned the wheel. Even the least bit of turn increases the drag on the inside axle.

ozman3918

I didnt feel the torque steer ,maybe because it was pretty muddy and slushy from my starting point and no real turns after.I figure if it was serious id be hearing something by now.I am worried about long term damage if anything

abc4yew

Guys, as long as you were not taking any hard dry corners and your front and rears were aired the same or close and the diameters were the same there should be no problem. I've run faster than that with it in 4x4 when the highways are intermitently snow covered. Shouldn't lock in over 60 km/h 35mph and sometimes going through deep snow you need the pull more than the push. I have a dually and when the tires are aired the same the front rolling dia is gonna be less as 3500# on 4 tires vs 4200# on 2 tires. That is what differentials are for aren't they. ks

RamDan03

Yeah 70mph shouldn't hurt anything. I just wouldn't make a habit out of it. I've had mine up that high in 4hi without any issues. Like others said, it's mainly taking turns on dry pavement, and having varying air pressures that mess things up.

BigBlue

I've done 80mph in 4hi before. Of course, that's what my speedo was saying, not how fast I was actually moving. I wouldn't worry about it. Like RamDan03 said, just don't make a habit out of it.

torquefan

Look at and smell the fluids in the differentials and transfer case. If they aren't black with a barbecued smell you should be ok.

deere nut

I wouldn't worry about it. There are a lot of guys with BOMBED trucks running over 100mph at the drag strip and they do it in four wheel drive. Thats way more abuse that what a normal driver ever does.

DSLRammin

Working in the oil patch, I see alot of new truck abused. Our trucks out in the field now days do not shut off and no one takes them out of 4x4. Highways, back roads, fields, you name it, at all speeds. In the many years out here, we rarely see a failure.

kayjh

Can some one tell me what all the fuss is about?

The owners manual says not to engage 4H above 80 KM/H and not to drive on hard dry surfaces with 4H (or 4L) engaged. You can disengage the transfer case at any speed. I often drive on mixed snow/ice/dry highways where 4H helps keep the truck stable and moving straight ahead (no swaying or fishtailing) at speeds of 100KM/H to 110KM/H. When I disengage the 4H (switching to 2H), the change occurs immediately and without binding "lockup". I take this to mean that the transfer case isn't "tight" from running in this fashion.

I've owned Jeep products over the years with the same PT 4 wheel drive system and a manual transfer case lever (where you can easily feel any transfer case binding) and have operated it in the same fashion without problems.

The bottom line: Don't shift into 4H above 80KM/h (50 MPH) and don't drive on dry surfaces in 4H (or 4L).