Allison LCT1000 Transmission

[TxDoc]

1--Allison LCT1000 Transmisison Limited Service!

 

 

General Motors recently released for sale the 2003 C4500 to the public through both light-duty and medium-duty delerships. Many of these trucks will be equipped with the Allison LCT1000 transmission. All internal repairs to the Allison LCT1000 transmission installed in the C4500 are to be completed by an authorized Allison distrubutor/dealer only.

The Chevrolet and GMC light-duty dealers curreclty selling and servicing the C/K2500HD and C/K3500 pickups equipped with the allison LCT1000 are not Allison distrubutors and therefore are not authorized to make internal repairs to the Allison LCT1000 in the C4500 trucks.

 

Light-duty Chevrolet and GMC dealers selling the C4500 can service only external wiring harness, shift linkage, cooler lines and fittings, flywheel/flexplate and transmissoin mount. The speed sensors and NSBU are not serviceable items for light-duty dealers.

 

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2-Allison LCT1000 Transmission 5/4/5 Shift "Busy-ness"

 

 

Allison LCT1000 may experience a condition of shift "busy-ness" or frequent shifting from 5th to 4th to 5th while towing or under heavy loads.

A new TCM calibration has been released to improve the shift busyness. The TCM calibratoin is available on TIS 2000 version 3.50 or later (released 3/34/02).

 

The calibration also contains a feature which allows 5th gear to be disabled/inhibited if desired.

 

Thanks to Cop Dodger.

 

Move this to another topic area is needed.