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-   -   Please explain my 4x4 (http://www.ramforumz.com/showthread.php?t=85218)

Bearwhiz 06-18-2011 08:42 AM

Please explain my 4x4
 
I know I dont have the limited slip on my 3.55 rear end. But, what is the difference between 4 wheel Hi and 4 wheel lock when I put it into 4 wheel drive. I know it has only to do with the front differential. When I had my 2002 Ford 4x4 it had the limited slip and when you put it into 4 Hi the front end was pullling but steering wasn't effected very much. But when you put it into 4Lo it was evident it was all pulling together as it had limited steering and a slight touch of the gas pedal was instant excelleration.

ArmyofOne 06-18-2011 02:13 PM

Just means the diffs are locked. Dont try to turn sharp on anything but the slickest surfaces. If your tires have any grip at all the drivetrain will bind and you WILL break something.

Bearwhiz 06-18-2011 02:45 PM

So in other words at least both front wheels are pulling?

wannab 06-18-2011 04:40 PM

with out lsd, you will have one front and one back getting power at any time.

Bearwhiz 06-18-2011 09:47 PM

Only one of the front wheels pulling? That sucks and definitley not what I want. Time to get rid of this POS.

Gene K 06-18-2011 10:48 PM

Thats normal. If you have the transfer case that has both a 4 wheel hi and 4 wheel hi lock then the 4 wheel hi allows differentation between the front and rear axles. Lock turns the drive shafts the same speed regardless which can result in binding and possible breakage on hard surfaces. You are supposed to use hi when you are going asphalt to snow and back again constantly. You use lock when you need the extra traction and/or are on a constantly slick surface.

4 Wheel Lo Lock works like Hi Lock except it goes through an extra gear-set (2.72) in the transfer case. Basically its like going from 3.55 gears to 9.66 gears in the axles.

Very few 4wd vehicles come with any kind of limited slip or locking front differentials as this makes the vehicle very hard to steer. Without the outside wheel being able to turn faster than the inside wheel the vehicle will go straight.

Bearwhiz 06-19-2011 08:47 AM

Thanks Gene, thats the best answer I've received so far.

Wildcat 06-21-2011 01:27 PM

What wannab was saying may be a little misleading. Differentials are set up with gears that allow transfer of power to the way of least resistance. This is designed to avoid excess wear going around corners, because the two tires will travel a different radiuses, and therefore different distances (different numbers of rotations) to navigate the same turn. If all four tires are met with equal resistance, they will all four turn. However, if one tire on one axle gets hung up on a rock, stuck in deeper mud, the opposite tire will receive the power.

You can purchase an aftermarket locker for your rear axle, and if you are going to do it, Detroit makes the best ones. They replace the carrier and spider gears allowing equal force to be distributed to both tires. The disadvantages are added wear on all axle components and quicker tire wear. In the front axle, a locker will make steering more difficult because the inside tire will have to slip in order to allow enough rotations on the outside tire to make the turn.

Bearwhiz 06-22-2011 09:35 PM

Thanks Wildcat. My head is spinning but I'm starting to get a grasp on it. So would I be better of leaving my gears as they are in the long run. I dont get off raod too often but when I do I can be several miles down the beach and its a long walk back.

Wildcat 06-23-2011 01:07 PM

I had 32x11.50 tires on my Jeep with 3.54 (3.55 Ram) gears a 2:1 (2.72:1 Ram) transfer case ratio a 2.99 (3:1 Ram) 1st gear which is geared higher (lower gearing is better off road, more engine revolutions to move the tires, allowing more power per entire revolution of the tire) than our trucks with similar sized tires. I took it on the sand multiple times with no lockers, just aired down and had no problems.

If you are sticking with stock or +1 tires, then I wouldn't bother with your gears. You could talk to your local 4x4 shops and see what they would charge for a Detroit Locker and install. It won't be cheap, but it will significantly improve your capability offroad, but will sacrifice some on road manners.

Most guys are doing fine on the sand stock as long as they air down their tires. This gives you more of a footprint, which allows the weight of the truck to be spread over a larger surface area. I know some beaches have air compressors to refill your tires, but I would suggest having an alternate way of airing up your tires just in case.

I saw that one guy on here took some 2x12's and put grip tape, like for a skateboard, on them and took them on the beach with him for traction in case he got stuck. That would be a cheap extraction option for you to throw in the bed just in case.

I know this is a lot of info, but hopefully it helps.


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