Sonnax has introduced a line of bushing kits for GM transmissions, which the company says can help avoid bushing failure, harsh shifts, burnt clutches and gear ratio or solenoid codes. Models covered are the GM 6L45/50 (part number #104030-01K) and the GM 6L80/90 (part number #104030A-01K).
According to Sonnax, these kits limit bushing wear and and include upgraded material composition and wear characteristics that help eliminate premature deterioration.