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99-8-1
  • TRANSMISSION - 4R100 - SHIFT FLARE (RISE IN ENGINE RPM) DURING 2-3 AND/OR 3-4 UPSHIFT - VEHICLES BUILT THROUGH 12/7/1998 WITH 7.3L DIESEL ENGINE
Publication Date: APRIL 15, 1999

LIGHT TRUCK:
1999 SUPER DUTY F SERIES

This TSB article is being republished in its entirety to correct the vehicle build date.

CALIBRATION:

9DTA-AC, 9DTA-AD, 9DTA-AJ, 9DTA-AL, 9DTA-BB, 9DTA-BE

WARNING: THIS MODIFICATION IS AUTHORIZED ONLY FOR THE LISTED ENGINE. PERFORMING THIS MODIFICATION ON OTHER ENGINE CALIBRATIONS IS UNAUTHORIZED AND COULD CREATE LIABILITY UNDER APPLICABLE FEDERAL OR LOCAL LAWS.

ISSUE:

A shift flare (rise in engine rpm) of 200-300 rpm may occur intermittently during 2-3 and/or 3-4 upshift on some vehicles. This may be caused by reduced Pulse Width Modulated (PWM) flow at the transmission solenoid body assembly.

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