Driveline - Clunk/Grunt Noise On Start Up

Article No.
87-22-18

^ DRIVELINE - "CLUNK" OR "GRUNT" NOISE FROM DRIVELINE DURING STARTING AND STOPPING

^ NOISE - "CLUNK" OR "GRUNT" FROM DRIVELINE DURING STARTING AND STOPPING

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





This article is being republished in its entirety to clarify the slip yoke application chart.

ISSUE:
A "clunk" 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" 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 appropriate Shop Manual, Section 15-60 for slip yoke removal and installation procedures. Also, refer to the slip yoke application chart below for the correct service part number.

PART NUMBER PART NAME CLASS

E6TZ-4841-D Slip Yoke C
E6TZ-4841-E Slip Yoke C
E6TZ-4841-F Slip Yoke C
E4TZ-4841-G Slip Yoke B
E1TZ-4841-D Slip Yoke B
D5UZ-4841-C Slip Yoke B

OTHER APPLICABLE ARTICLES: Supersedes 86-21-14, 87-17-11
WARRANTY STATUS: Eligible Under Powertrain Coverage
OPERATION: SP872218A
TIME: 0.6 Hr. DLR. CODING: Basic Part No. 4841 - Code: 41