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Vehicle Info NeededSONNAXPART NUMBER: 852-4T65E-LB1
Line Pressure Booster Kit 4T65-E
$6148
Ships on 09/09/2026
Lowest Price GuaranteeGM
Line Pressure Booster Kit4T65-E
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.
- Line Boost Valve
- Reverse Boost Valve
- Pressure Regulator Spring
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.
- 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
Part TypeAutomatic Transmission Reverse Boost Valve
BrandSONNAX
Package Height1.25
Package Width4.75
Package Length6.0
Weight0.15 PG
Part CategoryReplacement Parts
Part FitmentSemi Universal
Vendor Part Number4T65E-LB1
Package Qty1
Package TypeEA
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Some parts are not legal for use in California or other states with similar laws / regulations
