A/T - Clunk/Grunt From Driveline

SIL 87-36 (Nov)

SUBJECT: Ford Truck

LIGHT TRUCK:
1978-87 E-250/350
1981-87 F-150/350, E-150
1983-87 RANGER
1986-87 AEROSTAR

ISSUE:
A "clunk" and/or "grunt" noise from the vehicle driveline during start-up and stopping drive modes may be caused by engine torque preventing the slip yoke from sliding smoothly on the transmission output shaft splines. During the same drive modes. rear suspension wrap-up overcomes slip yoke-to-output shaft friction causing sudden slip yoke/driveshaft movement, which results in a "clunk" and/or "grunt" noise. The affected vehicles are 1978-87 E-250/350 with a C6 transmission; 1981-87 F-150/350 (4x2) with a C6. NPG 435. AOD, TOD, or T18 transmission; 1981-87 E-150 with a C6 or AOD transmission; 1985-86 F-150/250 (4x4); 1983-87 Ranger (4x2) and 1986-87 Aerostar.

ACTION:
To correct this, install a new design slip yoke with nickel-plated splines to allow for smooth slip yoke movement.

Refer to the slip yoke application chart below for the correct service part number.

PART NUMBER PART NAME CLASS
E6TZ-4841-D Slip Yoke B
E6TZ-4841-E Slip Yoke B
E6TZ-4841-F Slip Yoke B
E4TZ-4841-G Slip Yoke B
E1TZ-4841-D Slip Yoke B
D5UZ-4841-C Slip Yoke B




Slip yoke Application Chart