I think the original post or question brought up was whether you "could" not "should you", especially in adverse conditions. You can't compare the gearbox out of some older model vehicle to a newer updated one.
Don't get me wrong, I don't think a trip from Houston, TX to Phoenix, AZ in my part-time 4WD FJ in 4H is a good idea regardless of driving conditions. But if the roads are way crappy or I'm driving 20 plus miles on isolated gravel/sandy on or near our land near Mexico City I'm going to be in 4H.
Heck I did it in my Grand Cherokee with over 80,000 miles on it ALL the time. Especially while looking for some good surf spots in Mexico on way crappy roads.
Guess I'll wait for the I told you so's.
Quote:
FJoel previously said:
Nice link! Seems like a no brainer to anyone who actually wheels and likes to know what is going on inside/under their vehicle. MUST READ FOR NOOBS or SMART @SSES.
Exactly, hey some of us actually wrench and have a general understanding of how things work. Doesn't mean we won't disagree.
http://www.revo1.com/subbietranny/
P.S. Ohh yeah, a majority of the binding in wheelin occurs while turning, especially with a tighter turning radias.
Last edited by Hotrodguru : 09-07-2006 at 08:29 AM.
Tire air pressures vary. Tire wear differs. Tires end up with slightly different diameters. Roads aren't always as straight overall as they seem.
Pretend the front tires are 31.5" in diameter.
Pretend the rear tires are 31.4" in diameter.
A tire 31.5" in diameter travels 8.246680715673 feet in one rev.
A tire 31.4" in diameter travels 8.220500776893 feet in one rev.
Drive your manual mandated monthly 10 miles in 4Hi.
The 31.5" tire turns 6402.5759963825 revolutions.
The 31.4" tire turns 6422.9663657980 revolutions.
The rear tires experience twenty revolutions more than the front tires.
No, that's not the real world, tires aren't round and I've ignored significant figures. But it's enough for me to follow the recommendations of an owners' manual and leave a part-time transfer case in 2WD on the pavement. My 2¢.
Re: Here is why part time 4WD should never be used on dry pavement
The picture is of a blown Chrysler transfer case. Somehow I think Toyota is going to hold up much better. I agree that driving a part time 4x4 at 70 in 4H is foolish. I also think that Toyota knows what it's doing and the manual does not sya to take it off road before engaging 4H on a monthly basis.
Re: Here is why part time 4WD should never be used on dry pavement
Quote:
philipl previously said:
The picture is of a blown Chrysler transfer case. Somehow I think Toyota is going to hold up much better. I agree that driving a part time 4x4 at 70 in 4H is foolish. I also think that Toyota knows what it's doing and the manual does not sya to take it off road before engaging 4H on a monthly basis.
that is not a Chrysler Tcase, it is the tcase they put in jeeps however, and yes they can end up like that. However to get into that shape I believe the torque reduction of 4 low would more than likely have to have been used. Another big factor is several companies make a 4 to 1 ratio for that case, the np231, which is engineered for a much higher ratio, 2.61 to 1 I believe. They make another case that is engineered for a 4 to 1, which is used in the rubicon, Since the Ruby came out in 03, a lot of guys have been throwing 4 to 1 gears in the 231 and having splitting problems.
Now. as I have mentioned, I have run highway speeds in 4 high on dry pavement in several different machines, without ill effect. I do not do it because I want to see broken parts, but because **** happens. I think being so scared of something can be more negative than not fearing it. Yes there is benefit to running a few miles once a month in 4 high, being to scared to do it could be worse.
Re: Here is why part time 4WD should never be used on dry pavement
Quote:
1911 previously said:
Someone should tell Toyota, since that bastion of liabilility-avoidance the owners manual says to drive it in 4WD for at least ten miles every month.
With the understanding that you follow the other recommendations in the manual for transfer case usage...mainly, don't drive in 4wd on dry pavement.
Take it on a dirt road and drive in 4h. If you aren't doing 10 miles a month in the dirt, worrying about your transfer case and front diff getting lubed up probably aren't much of a concern.
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Inchworm Gear E-Locker Guard
It would be great if I had a clue, but let's face it, that's just not gonna happen.
Re: Here is why part time 4WD should never be used on dry pavement
Quote:
1911 previously said:
Someone should tell Toyota, since that bastion of liabilility-avoidance the owners manual says to drive it in 4WD for at least ten miles every month.
I was surprised with the wording of the OM also.
Quote:
Four−wheel drive system (part−time four−wheel drive models)
“H4” (high speed position, four−wheel drive): Lever at “H4” Use this for normal driving on wet, icy or snow−covered roads. This position provides greater traction than two−wheel drive.
You should drive in four−wheel drive for at least 16 km (10 miles) each month. This will assure that the front drive components are lubricated.
So if the roads are wet, go ahead and put in it 4Hi?! So says Toyota.
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