4x4

[wildbill23c]

Speed isn't going to cause a mechanical problem unless your trying to drive on a dry paved road and turn at the same time. That's what will cause problems.

There are full time 4wd vehicles out there that you can't take out of 4WD, my jeep for one that has a constant 40/60 split torque and I drive it all the time at speeds up to 75-80mph and I've never had a problem.

4Hi don't have max speed limits other than when shifting into or out of 4Hi.

4Lo on the other hand I believe you aren't supposed to go faster than 35MPH. I don't have my tundra manual with me to check that for sure, but that's what it lists for my Jeep, and it has a lower ratio transfer case than the Tundra, so I would guess maybe 40MPH with the tundra and that would probably be pushing it pretty hard. But I don't know I've never had the need for 4Lo in any of my vehicles, if 4Hi don't get me out then I stay home pretty simple. Same thing with snow chains, if I have to put chains on I stay home. Not worth the trouble.

Does anyone know what kind of mileage you get in 4WD? I think mine dropped about 3-4MPG since I've used the 4WD a couple times on this last fill up. I love the fact that the traction control system still works in 4WD. Anti-lock brakes are also great on this truck, my 88 F-250 only had rear ABS which I found useless, I think front ABS would make more sense especially keeping the front wheels from locking up so you can steer the vehicle.

[tundratom]

speaking of 4wd and dry pavement. I need to use 4WD-HI to get my trailer in and out of my back yard. I have been engaging 4wd in the street (dry pavement) then backing into my yard. I do this, because sometimes 4WD HI engages instantly, other times it takes a bit. And I don't want to get stuck. Yes, I've already gotten stuck in 2wd in my own yard :-( So my question is, is that sometimes I maybe backup 20ft in 4wd hi while turning a bit. I can hear/feel the tires scrubbing a bit. How much wear is this causing? I'm going to try to get it straight before engaging 4wd from now on (have done this about 10 times so far). sorry for the book :-)

[Moxie]

Tundratom: not a problem at slow speeds. the scrubbing noise is tire wear and wouldn't effect the driveline. As a side note, the truck won't let you engage 4 wheel drive at higher speeds. Try it over 60 and it beeps and flashes til you slow down.

[tundratom]

That's good to hear. I was worried that my driveline was binding some. Wasn't sure how much it can take.