3.73 anti-spin
09-22-2004, 04:11 PM
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3.73 anti-spin
I have one complaint with this rearend. I thought the purpose of the antispin was if one tire started to spin the rearend would lock up and spin the other tire also. Its like playing the lottery with my truck. Sometimes it spins two, and other times it spins just one tire. Has anyone else noticed this?
09-22-2004, 04:23 PM
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You would think when you powerbrake it would always take off spinning two. There is times when it takes off spinnig two, and then switches too just one tire. But i guess thats normal, just not predictable.
09-22-2004, 04:46 PM
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Both wheels must be rotating some for the anti spin to work. It is really strong distributing equal power, but you must be "moving" for it to work. If you are at rest and try to move and only one wheel spins, brake modulation will get the other wheel turning and the anti spin will kick in. It is just the nature of this "clutchless" design. With a little practice, you will be very happy with it. I am!
09-22-2004, 05:15 PM
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Well, my truck has several times left two big black streaks of rubber with the 3.73 anti-spin, and whenever I hit the throttle going around corners (not hard, mind you) the thing tries to do a powerslide on me! 
09-23-2004, 07:37 AM
#7
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Limited Slip Differential -- Operation Overview
Found this on another Diesel site, and thought it would be of interest to all 3rd Gen Owners with LSD's
The following is a S.T.A.R. Center Case Report:
Report created Jan 6 2004
Updated Jan 13 2004
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 spin and 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 vehicle 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
Looks like both rear wheels must be rotating for it to operate properly , so not much help starting out on a slippery surface in 2WD.
Nothing like the old positraction with clutches the way I read it.
Found this on another Diesel site, and thought it would be of interest to all 3rd Gen Owners with LSD's
The following is a S.T.A.R. Center Case Report:
Report created Jan 6 2004
Updated Jan 13 2004
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 spin and 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 vehicle 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
Looks like both rear wheels must be rotating for it to operate properly , so not much help starting out on a slippery surface in 2WD.
Nothing like the old positraction with clutches the way I read it.
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09-23-2004, 10:48 AM
#8
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Nope...try again...use brake modulation and the performance of this one will blow away the old clutch type. Once spinning...the both tires have much more equal power distribution and engagement.
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