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Just released yesterday, May 8, 2008. It appears the new, optional calibration will hold each gear longer before upshifting. Like the document says though, it will likely have a negative effect on fuel economy.

#08-07-30-022: Hesitation or Flat Spot Between 56-80 km/h (35-50 mph) (Reprogram Transmission Control Module) - (May 8, 2008)

Subject: Hesitation or Flat Spot Between 56-80 km/h (35-50 mph) (Reprogram Transmission Control Module)
Models: 2008 Buick Enclave
2007-2008 GMC Acadia
2007-2008 Saturn OUTLOOK
with FWD or AWD
--------------------------------------------------------------------------------
Condition
Some customers may comment on a flat spot or hesitation between 56-80 km/h (35-50 mph) speed range.

Cause
The existing transmission calibration is programmed to maximize fuel economy and requires a greater throttle input than some customers would prefer to provide acceleration in this speed range.

Correction
A new calibration is available. This new calibration increases the speed required to obtain upshifts and removes TCC apply from 2nd to 3rd gear, thereby reducing engine lugging and improving vehicle response to accelerator input.

Important: This calibration will have a negative impact on fuel economy of 0-1.2 L/100 km (0-2 mpg) combined driving.[/color]

To obtain this calibration, contact Techline (TCSC) at 1-800-828-6860 (English) or 1-800-503-3222 (French). Techline will reconfigure the vehicle to make this calibration the default calibration for this vehicle.

The table below shows the Shift Pattern Change at Light Throttle.

--
Current Calibration New Calibration
Shift MPH KPH MPH KPH
1-2 8 13 12 19
2-3 18 29 20 33
3-4 24 40 31 50
4-5 32 53 43 69
5-6 44 71 56 90

TCC Applied 2nd, 3rd, 4th, 5th, 6th 4th, 5th, 6th

Warranty Information
For vehicles repaired under warranty, use:

Labor Operation Description Labor Time
K5364 Transmission Control Module Reprogram with SPS Use Published Labor Operation Time

Thanks GeoHawk! See original thread - http://www.acadiaforum.net/forum/index.php?topic=3729.0
 
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