Toyota Hilux Surf 1993 Owner's Manual page 234

AT–37
AUTOMATIC TRANSMISSION – On–Vehicle Repair
2. INSTALL SPEEDOMETER DRIVE GEAR
(a) Install the snap ring and lock ball.
(b) Slide the speedometer drive gear on the shaft.
(c) Using snap ring pliers, install the outer snap ring.
3. INSTALL EXTENSION HOUSING (See page AT–34)