Turbo 400 TH400 Transmission Sonnax Line Pressure Booster Kit fits GM 400-LB1

img{max-width:100%}Sonnax TH400 Line Pressure Booster Kit GMThis kit includesLarge Ratio Boost AssemblyStronger Pressure Regulator Spring2 O-Rings  Sonnax hydraulic line pressure booster kits contain stronger pressure regulator springs and large ratio boost valves designed to work together to provide progressive pressure increases as driving conditions become more demanding.  Our pressure regulator springs are approximately 10% stronger than OE and more conservative in impact than other aftermarket “kit” springs. Large ratio boost valves provide higher pressure incrementally and when it is needed the most. The combination of these springs and valves in a Sonnax kit gives you the best of both worlds: a modest pressure increase at the low end, with a high-end pressure that is equal to or greater than that of other aftermarket “kit” springs.  Parts ship daily from our distribution center. FREE SHIPPING on US Orders GOT QUESTIONS on your specific Year/Make/Model? Send us a message in eBay ¿Habla español? Escríbanos con el año, la marca, y el modelo de su vehículo. Visit our eBay Store: Phoenix Transmission Parts for all of your Automatic Transmission Part needs Be sure to add me to your favorites list!