Cummins FAQ's

[Diesel Dually]

Lets start a FAQ section here.

Post up the questions, answers TSBs and I will consolidate them all into one FAQ Post...with credit due to the original poster.

 

[hoot]

Tow/Haul Operation on the 48RE

The 48RE also includes a “Tow-Haul” button on the shift lever. This feature locks out overdrive and locks the torque converter clutch. If you engage Tow-Haul at speeds above 50 mph, the transmission will shift or stay in third gear and the converter will lock. If you shift the transmission manually to second gear when you slow down to below 50 mph, the transmission will shift down to second gear with locked torque converter.

The safe input limit is 567 Lb/ft. By safe it means the limit that will make the trans last at least through the extended warranty period, and most likely as long as an owner could reasonably assume one would last under normal conditions (ie 100,000 to 120,000 miles)
Many exceed this amount, and the trans still holds up, but the bottom line is the more power through it results in more heat and stress, and reduced life.

The 600 is torque managed to a max of 567. The 33 lb/ft loss is to account for accessory loads, A/C, fan, and generator. If the accessory loads are high, the engine is making 600 less the load. no loads, it is managed to the 567 max.

The 555 is able to run full tilt, the 600 is torque managed. That being said, all 2003+ torque manage during shifts to save the trans.

 

[hoot]

48RE AUTOMATIC TRANSMISSION FILL

Service Fill - 48RE 3.8 L (4.0 qts.)
O-haul - 48RE 14-16L (29-33 pts.) L
Service Fill - 45RFE/545RFE
4X2 - 5.2 L (11.0 pts.)
4X4 - 6.2 L (13.0 pts.)
O-haul - 45RFE/545RFE 14-16 L (29-33 pts.) L
L Dry fill capacity Depending on type and size of
internal cooler, length and inside diameter of cooler
lines, or use of an auxiliary cooler, these figures may
vary. (Refer to 21 - TRANSMISSION/AUTOMATIC/
FLUID - STANDARD PROCEDURE)

 

[hoot]

3rd Generation Common Torque Specs

Injector securing bolt= 8mm 10nm
Injector wire nut=8mm 1.25 nm Extremely light dont break the copper stud on the injector!
Rocker=10mm 34nm
Male connector nut=24mm 50nm
Fuel lines=19mm 30nm
Intake arm=10mm 24nm
Rocker box bolts=10mm 24nm
Valve cover and vanity cover= 10mm 24nm
Fuel line and rail securing bolt=10mm 24nm

 

[hoot]

TRAC-RITE DIFFERENTIAL

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.

 

[michael nelson]

good post,hoot...cool-

 

[hoot]

Just to be clear I left out the Trac-Rite is the diff used in the Dodge AAM axles. I don't want these fluid recomendations used on GM AAM axles with the Eaton unit.