Reference Number(s): 01-13-7, Date of Issue: July 9, 2001 Related Ref Number(s): 01-13-7
4R70W - CLUNK NOISE HEARD ON 2-1 DOWNSHIFT
TECHNICAL SERVICE BULLETIN
NOISE - "CLUNK" NOISE HEARD ON 2-1 DOWNSHIFT - VEHICLES EQUIPPED WITH 4R70W AUTOMATIC TRANSMISSION TRANSMISSION - 4R70W - "CLUNK" NOISE HEARD FROM TRANSMISSION ON 2-1 DOWNSHIFT
FORD: 1999-2001 Crown Victoria, Mustang 1999 F-250 LD 1999-2001 E Series, Expedition, Explorer, F-150 LINCOLN: 1999-2001 Town Car MERCURY: 1999-2001 Grand Marquis, Mountaineer
THE "CLUNK" NOISE DESCRIBED IN THIS ARTICLE SHOULD NOT BE
Page 1 of 4
Some vehicles equipped with a 4R70W automatic transmission may exhibit a "clunk" noise during the 2-1 downshift event. The "clunk" noise will be consistent in nature, and will occur during most 2-1 downshifts. This may be caused by a Planet Support Spring that is out of position.
Check for the correct installation of the Planet Support Spring. If the spring is not installed correctly, the Planetary Gear Support will make contact with the transmission case during the 2-1 downshift, causing the "clunk" noise. Refer to the following Service Procedure for details.
1. Use Chassis Ears (Rotunda number 107-R2102 or equivalent) to verify the "clunk" noise is originating from the transmission during the 2-1 downshift event.
Fig. 1: Planet Support Spring Correct Installation
Fig. 2: Planet Support Spring Incorrect Installation
PARTS INFORMATION Part Number
This is a Tech bulliten about a possible answer to your problem.
Tuesday, March 2nd, 2010 AT 3:42 PM