Sierra / Silverado 4-speed performance transmission – Clean + TransGo Shift Kit For sale: GM 4-speed transmission (Sierra / Silverado) The transmission is very clean inside and has been disassembled, ready to go. It has a TransGo shift kit installed (improves shifting and strengthens the transmission). No signs of burning or internal damage. Exterior has minor scratches from removal and installation (normal). The transmission was a spare and extra for a powerful modification project. Anyone familiar with transmissions will know its value. Urgent sale due to necessity, and the price is firm. Note: The transmission is disassembled – sold as-is. There is an additional video available. Please contact privately and send your number.