How fast can you drive when you are in 4x4 hi? I know that in low gear your not supposed to exeed 25 mph (40 km\h). But there's nothing in the book that says what speed you should not exeed in 4x4 hi.

Some days when we have a huge snow fall it's nice to have the 4 hi and just go threw the snow like it wasn't there.

Thanks

Corb

 

Corb, I use my 4x4 under 40 mph, once the TC locks in OD my trucks bucks really bad, so I keep it under 40.. as long as my TC doesnt lock im fine.
I thought i read somwhere that the front diff is 3.54 and the rear is 3.55.. sheesh i dont remember..i probably dreamed it..

 

40 mph is a good speed to stay under. You dont really even need it when your going that fast tho

 

You weren't dreaming, the front is supposed to pull ever so slightly. It's supposed to increase stability and reduce the tendancy of the rear walking around.


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So these trucks have a mis-matched gear set front to back?

 

In 4hi, you can drive as fast as you wanna take it....meaning it aint gonna hurt anything. But as these guys have said, staying under or right at 40 is a purdy safe figure. Besides, if your driving in an area where you need 4hi such as sand, rocky dirt roads, ice etc....you would be purdy...ummmm.....guttsy to take her past 40.

 

Not really mismatched. The front ratio is slightly lower to pull the truck so the rear isn't pushing, greater stability. But it's not like it actually drags the rear end along, just enough to make sure the front is doing its job plus like 1% .


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You can be up to .03 apart on gear ratios (4.27/4.30's) on a street driven rig with no issues, your air pressure and tread depth differences will be more than that usually.

As long as you have no U joint's going bad, and your driveline is at the proper angle (corrected for lift!) then you should have no issue driving as quick in 4hi as 2hi. The unit bearings are spinning the axle shafts anyways... Look at all the 'race' vehicles running 100mph in 4wd, not running components any different then whats under our rigs.


I however hate the handling of a vehicle at higher speeds in 4wd, it will tend to push into turns and in a skid it can mess with your ability to 'steer' out of it as the whole vehicle will walk over vs. rotating on the fronts like in 2wd.

 

I have always been told no more the 45mph.

 

I just use it when there's a lot of snow. I don't go rock crawling or playing in the sand. Driving on the way home sometimes in thick snow, traction aint the greatest, and 4x4 comes in handy.

You would figure that it should not be a problem considering that they always turn at all speeds when your in 2 hi. so other than the front axle getting power, and pulling shouldn't make much difference.

I only use it when I really need it, on snow or slippery conditions.

Corb