Holding Clutches

HOLDING CLUTCHES

DESCRIPTION





Two hydraulically applied multi-disc clutches are used to hold planetary gear-train components stationary while the input clutches drive others. The 2/4 and Low/Reverse clutches are considered holding clutches and are contained at the rear of the transmission case (Fig. 171).

OPERATION

NOTE: Refer to AUTOMATIC TRANSMISSION - 42RLE - DIAGNOSIS AND TESTING for a collective view of which clutch elements are applied at each position of the selector lever.

2/4 CLUTCH
The 2/4 clutch is hydraulically applied in second and fourth gears by pressurized fluid against the 2/4 clutch piston. When the 2/4 clutch is applied, the front sun gear assembly is held or grounded to the transmission case.

LOW/REVERSE CLUTCH
The Low/Reverse clutch is hydraulically applied in park, reverse, neutral, and first gears by pressurized fluid against the Low/Reverse clutch piston. When the Low/Reverse clutch is applied, the front planet carrier/rear annulus assembly is held or grounded to the transmission case.