AUTOMATIC TRANSMISSION SERVICE GROUP
Technical Service Information
Figure 191 Figure 192
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, shown in Figure 193, 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 193, while holding the drain plug with the proper size wrench so as not to loosen the
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 193. The "Fill" plug in the extension housing is your only way to
replace and/or fill with fluid, in the 5R55N transmission.
We have also identified the cooler line fittings and lines, as shown in Figure 192.
Copyright © 2001 ATSG
THIS UNIT REQUIRES MERCON V®.
R3 T9 A