Sonnax 700R4-LB1 Line Pressure Booster Kit 4L60 (700-R4) 200-4R

Line Pressure Booster Kit

4L60 (700-R4), 200-4R

Valve

Sleeve

O-Rings (2)

Pressure Regulator Spring

Line pressure booster kit 700R4-LB1 fits GM 4L60 (700-R4) and 200-4R transmissions. 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.

Sonnax 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.

Achieve shorter shifts and increased torque capacity without creating low-speed harshness

Improved band and clutch holding capacity for increased durability

Progressive pressure increase as driving conditions become more demanding

All the benefits of increased line pressure without overloading the pump at idle

Simple and affordable drop-in solution with no special tools or reaming required