Automatic Transmission problems of the 1999 Chevrolet Silverado 1500

The vehicle is driven 1 hour at freeway speeds then when accelerating from a stop the 1-2 up shift slams into 2nd. The resulting hard upshift causes a forward uncontrolled lurch forward. This is particularly hazardous in rush hour stop and go traffic. Correction is a known gm issue TSB 01-07-30-023a. But not available at manufacturers financial participation if out of basic warranty. The issue is a design defect in material selection and needs to be replaced across the board. The lurching upshift is not an if it will occur on a vehicle but a when will it occur symptom. Research on the commonality of this defect can be researched through any search engine using the dtc p1870.

The contact owns a 1999 Chevrolet Silverado 1500. The contact experienced difficulty shifting the first and second gears of the vehicle. She took the vehicle to the dealer and they rebuilt the transmission. Approximately fifty thousand miles later, the failure recurred intermittently. The contact is in the process of taking the vehicle back to the dealer. The failure mileage was 45,000 and current mileage was 110,000.