THM 440-T4 – CENTER GEARBOX DISTRESS (LUBE CHANGES)

COMPLAINT: Repeated failure of the 3rd roller clutch and/or the input sprag.

CAUSE: Lack of lube oil to 3rd roller clutch and input sprag. Find more obd2 code reader for hlep?

CORRECTION: Modification as follows, of the parts indicated, will increase lube flow to both the 3rd roller clutch and the input sprag.

1 . MODIFY OUTPUT SHAFT:
Grind four (4) flats on the output shaft at the front of the bearing in the locations.

2. MODIFY OUTPUT SAHFT BEARING:
Remove idividual needle bearings, in three equally spaced locations around the bearing, to provide three “Troughs” for additonal lube oil to flow. Removing the needles does not impair the durability of the bearing assembly.

3. MODIFY ASSEMBLY PROCEDURE:
When installing the sprag assembly onto the input sun gear, align one of the three lube oil holes in the inner race, with one of the two lube oil holes in the input sun gear.

THM 4L60 (700-R4) HIGH LINE PRESSURE

COMPLAINT: Very harsh upshifts, all gears, harsh engagement forward gears and reverse.

CAUSE: High line pressure. The cause of the high line pressure can be a hung pressure regulator valve, or a binding slide in the pump body. The bind of the slide can be caused by mis-tightening the pump body to the pump cover. Another possible cause can be a blown orifice cup plug located in the pump cover shown in Figure 1. This cup plug is in the reduce pressure oil circuit.

CORRECTION: CORRECTION: The problem can be corrected by replacing the orifice cup plug. The orifice in this plug is .040-.045.

LUBE CHANGES

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FORD 5R55N – CHECKING FLUID LEVEL

Checking the fluid level on any vehicle equipped with Ford Motor Companys new 5R55N transmission may become confusing to some technicians. There is a plug in the extension housing, as shown in Figure 1, that would lead one to believe that this is where you check the fluid level, since some of the other manufacturers are currently checking fluid level in this manner, and it refers to the correct temperature to check the fluid right on the extension housing.

However, this is a “Fill” plug only on the new 5R55N transmission from Ford Motor Company, which is currently found in the 2000 Lincoln LS and some Jaguars. To “Check” for the correct fluid level, you must remove the check plug, which is located in the center of the bottom pan drain plug, and is removed with an allen wrench, as shown in Figure 1, while holding the drain plug with the proper size wrench so as not to loosen the drain plug.

We have provided you with a cut-away drawing of the bottom oil pan and the drain plug so that you will understand how this system works. Notice that the drain plug actually has a “stem” made on it that extends some distance up into the bottom pan, which is our way to establish the proper fluid level in the transmission. By removing the “Check” plug from the “Drain” plug, the fluid should just trickle over the stem and out through the center of the drain plug, as shown in Figure 1. The “Fill” plug in the extension housing is your only way to replace fluid in the transmission.

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FORD 5R55N - CHECKING FLUID LEVEL 2 FORD 5R55N - CHECKING FLUID LEVEL 1