front diff locking in h4

2005 tacoma when i put it in h4 it locks the front diff but the back is not???wtf

 

Is this a stock Tacoma? If so you don't have a front locker...

 

Need more information......

Are you saying....that when you put it into 4WD, the front wheels ARE driving but the rear is not?

Why do you think this?

 

more info needed to really answer your questions

 

in h4 it locks the front diff and the back is not locked
when on snow 2front are spinning and one of the rear which ever one has less grip. when i make a U-turn in h4 the front wheels shake

 

Don't make u turns on dry pavement in 4x4!

 

Do you have a TRD Offroad truck? Do you have lockers in the front & rear diff?

If NO....
OR
If you're not exactly sure what I mean by 'a locker' ....

Then I'm guessing you have OPEN differentials. Even when you are in 4WD - one of the wheels can and won't spin depending on the terrain. The POWER will go to the wheel with least resistance leaving the other wheel stopped completely. If one wheel is on the ground and the other wheel is off the ground (in the air), the wheel in the air will spin while the other wheel will not spin at all. That's how OPEN diffs work. On these trucks - They WILL NEVER be locked together unless you have a LOCKER in the differentials.

As for the shaking....DO NOT make tight turns while in 4WD. It will bind up the driveline and especially ruin your CV joints.

 

2005 TRD Sport it has h2-h4-hl so h4 is not like 4wd or is it

 

H-4 is 4 wheel drive.

 

Time to do your homework! Your owner's manual discusses how to operate your part time 4wd system. Here is one of several online links that discusses how it works. Take a drive with a friend who owns a 4wd truck for further training, or take a course. http://auto.howstuffworks.com/four-wheel-drive.htm

 

^ Yeah, this!

OP, you're mixing up "enaging" 4wd with having locking differentials, aka "Lockers." Your 2005 Sport does not have lockers on front or rear unless they were added.

By switching to H-4 (or L-4), all you are doing is engaging the front wheels via your transfer case. Both your front and rear differentials are "open" differentials, not "lockers." Simply put, an open differential transfers power to the wheel with the least resistance (least traction). If a front/rear tire is spinning, the other front/rear tire will not get any power and will not pull the truck.

The front and rear differentials operate independently of each other so it's possible that both front tires had traction (both were pulling) while a back tire had no traction (one spinning, one not moving). Basically, your truck is performing exactly as it's designed to.

Last point, never engage 4wd on dry pavement because it will damage your drivetrain. If you're in snow or offroad in 4wd, your front wheels will not shake during tight turns, etc.

 

Only the Offroad model comes with a locking differencial. You have 2WD, 4H and 4L. It's a part-time 4WD system so never engage it on dry pavement. Read the links below for more information...

 

What did you think H4 meant????

 

I'm just here for the popcorn.

 

H2 = 2WD
H4 = 4WD
4Lo = 4WD low range

You have the mechanical LSD (limited slip differential). It is better than an OPEN diff but not like a locker.

Depending on the terrain & situation...your mechanical LSD will still slip similar to an OPEN diff. Again.....the path of least resistance. Mechanical LSD is operated via clutch paks. Those clutch paks will only lock the wheels together under a certain torque limit. Once that torque limit is reached, it will allow the wheels to slip (similar to an OPEN diff).

Having a LOCKER in the differential - as seen in the TRD OFFROAD trucks.....when in 4lo range and when the locker is engaged, both wheels are locked together at all times regardless of terrain.

 

ok i think i got it
h2=hwy,rd
h4-l4 only use it when needed in mud or snow or other wet stuff when stuck
thanx all!