Hard, Soft, Delayed or Slipping 1-2-3-4 Shift Document ID: 1593288 - Pontiac G8 Forum: G8 Forums - G8Board.com
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post #1 of 1 (permalink) Old 02-05-2013, 07:31 PM Thread Starter
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Location: El Paso, TX
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Hard, Soft, Delayed or Slipping 1-2-3-4 Shift Document ID: 1593288

GM gave me this printout when I took my car in for transmission service. Thought it might be useful to those that live in colder areas.

6L50 / 6L80 / 6L90

DOCUMENT ID: 1593288


Note: On cold days, approximately 32F (0C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operation temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
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