Use 4L60E-LB1 for early pumps with long 1.907" sleeve. If your mechanically inclined you can do it but.
![transgo 4l60e shift kit line pressure transgo 4l60e shift kit line pressure](https://static.summitracing.com/global/images/prod/large/trg-4l60e-boost_w.jpg)
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.Achieve shorter shifts and increased torque capacity without creating low-speed harshnessImproved band and clutch holding capacity for increased durabilityProgressive pressure increase as driving conditions become more demandingAll the benefits of increased line pressure without overloading the pump at idleSimple and affordable drop-in solution with no special tools or reaming requiredNOTE: Fits late-style pump with short 1.810" sleeve only. I build transmissions for a living and if you want the shift faster and crisp then go with the transgo sk 4l60e shift kit it is around 35 bucks and u can taylor the shifts how you want them and can make it hit good without a corvette servo. Large ratio boost valves provide higher pressure incrementally and when it is needed the most.
![transgo 4l60e shift kit line pressure transgo 4l60e shift kit line pressure](https://cdn11.bigcommerce.com/s-2k7pw5vi/images/stencil/1280x1280/products/214/656/34165ET__12215.1474820036.jpg)
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. Line Pressure Booster Kit4L60-E, 4L65-E, 4L70-EFits Late-Style Pump ValveSleevePressure Regulator SpringO-Rings (2)Late-style pumpLine pressure booster kit 4L60E-LB2 fits late-style GM 4L60-E, 4L65-E and 4L70-E pumps.