Gear cooler available 40,000 BTU and 24,000 BTU to solve the gear heat problem. From Exedy company. And a thermostat valve is available for the gear temperature for Sierra and Silverado 6-speed from models 2014 to 2023. And for Yukon and Tahoe from models 2015 to 2020. And available snap fittings for hoses. Prices: Gear cooler: 390 Thermostat valve: 266 Fittings: 120