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- 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 |
| 1999 SUPER DUTY F SERIES |
This TSB article is being republished in its entirety to correct the vehicle build date.
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. |
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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