anti slip differential

[MKemp]

Can someone tell me how to check my rear differentail. The truck is 03 quad cab 4x4 with anti slip rear end. I keep getting hung up on level ground in two wheel drive. I only have one wheel pulling at the rear. I jacked up both sides of the rear of the truck. With one wheel touching the ground the other up on an jack. I can put the truck in gear. and the wheel which up is the only one that turns.

 

[drrhoades]

It sounds like you have an open differential. It should say on the build sheet for the truck. Or you can tell by jacking up both sides and putting the transmission into neutral. Spin one of the tires and if both spin in the same direction then you have a limited slip diff, if they spin in opposite direction then you have an open diff.

 

[radar doctor]

Good Info

Sounds Like a Plan...

 

[y-knot]

Many limited slips respond to a little additional drag. Just apply some light emergency brake, the drag will by not allowing 100% of the power to go to the wheel with no traction.

 

[JHardwick]

While having my truck in for a driveshaft problem, I saw mine running in gear with all fours off the ground. This rearend don't act like a Dana. Off the ground it appears to me an open rear.

 

[Hunter1]

Up in the air, try and spin the wheels like the old limited slips, one would go one way, one the other, then you knew you had a limited slip. (Hmmm, that may not be right, maybe both would go the same way?) Anyway, these new ones do not do either of the above!



Not with this critter, only one wheel moves when you spin it



Hunter1

 

[MKemp]

I have checked three different 03 trucks with anti slip and they all act the same. All three have anti slip on the build sheet

 

[Agades]

mine doesnt work worth a crap

 

[Rwhedges]

The following is a S. T. A. R. Center Case Report:

Report created Jan 6 2004

Updated Jan 13 2004

STAR Group: Trans Core

Created by: G. Knapp

Customer says his trac-rite rear diff is not working?

GCK1: 01/06/2004

Recommendation/Solution

Review AAM Trac-rite diff characteristics. Rear diff is working or truck wouldn't move. It will overrun like standard diff if operating on extreme differernces in surfaces. (Ice under one rear tire with other tire on dry pavement. ) No further action.

:GCKI:01/06/2004

The 2003 heavey-duty Ram uses and American Axle helical differential or Trac-Rite. The Trac_Rite differential is different then Trac-Lok in that it uses helical gears (Trac-Lok uses clutches) to transfer power to the opposite wheel when slippage occurs. The transfer of power from wheel to wheel is torque sensitive and must have both wheels spinning (not stationary) to function. It is possible for the Trac-Rite differential to not send power to a wheel if is not spinning. Example: Accelerating from as stop and one wheel is on ice and the other on dry pavement. If accelerating to fast, the wheel on the ice may spinand never send power to the whell on the pavement side. A slower start may be necessary to start the vehicles momentum.

A written test procedure for Trac-Rite is not listed in the repair manual and the following points should be noted:

Testing the Trac-Rite differential while the vehicla is lifted and turning one wheel by hand, the opposite wheel will turn in the opposite direction. This is normal.

If the Trac-Rite assembly has and internal failure it will lock axles 100% side to side.

To test the Trac-Rite process, raise vehicle on appropriate lift, place into gear and accelerate quickly (hard launch). A second technician will witness both wheels turning at the same speed at the start of the acceleration.

Another test for Trac-Rite is to slowly drive vehicle in an open area and completely turn wheels to one direction and accelerate hard. . The vehicle will experience tire hop or shudder. This is normal. Trac-Rite differentials do not require friction modifier and should be used only with SAE75W-90 GL-5 synthetic fluid PN 05102232AA.

The Trac-Rite differential found in the American Axles may look like the helical gears have ground away the case. Six small half circles are noticable on the side of the differential opposite of the ring gear. These openings are desinged for oil flow and are not the result of the helical gears grinding through the differential. Please do not replace the differential case or any other part of the axle due to these openings.

Note: All American Axles require Mopar lube part# 05102232AA synthetic and does not use a friction modifier.

RAB40: 01/13/2004



DUH!!

Maybe I wanted a Trac-Lok cause this doesnt sound to good to me when I wanted something to improve traction when one wheel was beginning to spin.

 

[SRadke]

Originally posted by Rwhedges

The transfer of power from wheel to wheel is torque sensitive and must have both wheels spinning (not stationary) to function.

So... . basically if you stop on slick ground you may as well have an open diff?



-Scott

 

[MKemp]

The theard from RWHedges is the response that I received from my local dodge service manager. This is also the type of message an Cummins rep. for dodge.

 

[EB]

The solution I've used is to lightly step on the emergency brake to get things locked up, then take the emergency brake off. I pull a trailer around muddy oil locations and this has worked for me.

 

[XJSuperman]

I think some folks are thinking this is a locking differential. Even the tightest "limited" slips will only help moderately. If you have one wheel that is under a great load (STUCK) then the wheel with less traction will spin... NOT the one with traction. And turst me... having owned and offroaded 4 jeeps. . all with "trash-lock... . you are better of GREATLY with the AAM "anti-slip"



Basically as the above description mentioned while BOTH wheels are spinning ifone begins to move faster or slower than the other the limited slip will help out to a degree... if one wheel becomes immobile it WILL NOT lock.



Also... do what it says above... cut the wheel hard one way and nail it. If you have the limited slip it will grab even on dry pavement because at first both wheels begin to SPIN... then the inner wheel goes alittle faster and the limited slip grabs. . then the truck wil "shuuder or hop" and slide the rear end around until you let off the go pedal... I have done it with mine.

 

[EB]

I misused the word "lock up". The rear end doesn't "lock up" as such, but by using the emergency brake it will help to "transfer" some of the power to the free wheeling side. This does work, I've done it a number of times to get started. I also think the limited slip on this truck is better than the one with the Dana axle. IMO

 

[PJ]

I had a "locking rear" in my 72 Chevy 4x4 and it was hell on rear tires. There was NO give what-so-ever! That was there from the factory as Im the orig owner. i might add that there is rarely a need to lock in the front hubs! Ive used this truck to blaze trails for my International TD-25 dozer. It will go ANYWHERE! My o4 Dodge is to commute in. I had the chance to drive it in the snow a week ago. I was wishing I was in my 72 Chevy. I spun out everywhere until I threw it into 4WD. then it was somewhat better. Dont get me wrong, I love my new 04! I just like the traction of my 72. I guess you can't have everything.

 

[XJSuperman]

What would ne nice is a selectable locker that was a limited slip while not engaged. But it shouldn;t be long before folks at detroit and ARB etc begin to make more parts for the AAM axles.

 

[PJereb]

Sounds like a Quaife differential. Take a look... ..... They should last a long time, and there are no clutches to wear out.



http://www.quaifeamerica.com/differentials/diffs.htm

 

[Hunter1]

Call it LS or Locking, whatever, personally, I have been in ass deep snow with only the original Firestone tires, (hwy) and in mud, and for what I can see the REAR end (whatever you choose to call it works just awesome!)



Hunter1

 

[PJereb]

Below is a picture of the Quaife torque biasing differential. It sounds like the AAM unit is identical. If you want real practical off road traction wait until ARB comes out with an air locker for the AAM units. Then of course, because you will have a compressor for your air lockers, you must get a pacbrake exhaust brake



A clutch type limited slip would just wear our at warp speed with lots of off road wheel spin. I would leave well enough alone and keep the stock AAM torque biasing differential, or if you decide to spend some $$$ get an air, or electric locker when they come out for the AAM axles. Don’t go cheap and just use a regular locker on a daily driver. The $300-$400 an axle you would save over an ARB would just be blown in a year or two on extreme tire wear from having your locker lock up around every corner in town. Not to mention regular lockers on the street are noisy, because your tires are chirping all the time and they make all sorts of LOUD clunking and popping noises when they engage and dis-engage. All that noise attracts law enforcement like fly’s to **!*



















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[DKillarney]

I was wondering if any one has found a locking diff for these lovely am axles I just out in the edge ez and boost elbow wow what an awesome one wheel show yuck I am also wondering if someone knows if i can use the 11. 5 out of a 3500 without modifying anything!!!