and here is the bulletin with specific information:
This bulletin is being revised to add model years, model and Allison transmission information. Please discard Corporate Bulletin Number 01-07-30-031 (Section 07 -- Transmission/Transaxle).
Transmission operation during cold weather has been revised on these vehicles to provide faster engine warm-up and improved heater performance. During initial key-up, if the intake air temperature (IAT) is less than -7°C (19°F), 1-2, 2-3 and 3-4 upshift speeds will be affected as detailed below.
1-2 Upshift
If the throttle position (TP) is less than 37 percent, the 1-2 upshift will take place at a minimum speed of 19 km/h (12 mph).
2-3 Upshift
• (2001 Model Year) If the throttle position (TP) is less than 37 percent, the 2-3 upshift will take place at a minimum speed of 51 km/h (32 mph).
• (2002-2004 Model Year) If the throttle position (TP) is less than 37 percent, the 2-3 upshift will take place at a minimum speed of 43 km/h (27 mph).
• If the throttle position (TP) is above 37 percent, the shifts will follow the normal shift pattern.
3-4 Upshift
• (2001 Model Year) If the throttle position (TP) is less than 37 percent, the 3-4 upshift will take place at a minimum speed of 75 km/h (47 mph).
• (2002-2004 Model Year) If the throttle position (TP) is less than 37 percent, the 3-4 upshift will take place at a minimum speed of 64 km/h (40 mph).
• If the throttle position (TP) is above 37 percent, the shifts will follow the normal shift pattern.
TCC Operation
If the transmission fluid temperature is less than 17°C (62.6°F), torque converter clutch (TCC) operation will not occur until the transmission fluid temperature is greater than 20°C (68°F).
(2001 Model Year) When the engine coolant temperature (ECT) reaches 77°C (171°F), 2-3 and 3-4 upshifts will follow the normal shift patterns. A brief description of operation may also be included in the Owner's Manual.
(2002 Model Year) When the ECT reaches 80°C (176°F), 2-3 and 3-4 upshifts will follow the normal shift patterns. A brief description of operation may also be included in the Owner's Manual.