Sonnax 4L60E 4L70E 4L65E Transmission, Line Pressure Booster Kit (Early Design)

Brand: Sonnax Other Part Number: 4L60E-LB1, S74507FS, S74507TEK-1, NX-4L60E-LB1 Interchange Part Number: 4L60E-LB1, S74507FS, S74507TEK-1, NX-4L60E-LB1 Manufacturer Warranty: Unspecified Length Fitment Type: Performance/Custom Items Included: Line Pressure Booster Kit Manufacturer Part Number: 4L60E-LB1 Superseded Part Number: 4L60E-LB1, S74507FS, S74507TEK-1, NX-4L60E-LB1 Universal Fitment: Yes Performance Part: Yes 4L60-E, 4L65-E, 4L70-E Line Pressure Booster KitPart No. 4L60E-LB1 Early-style "long" boost sleeve, 1.907" length. Line pressure booster kit 4L60E-LB1 fits early-style GM 4L60-E, 4L65-E and 4L70-E pumps. 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.