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Vehicle Info NeededSONNAXPART NUMBER: 852-77764-01
Billet Forward Clutch Piston 4L60, 4L60-E, 4L65-E, 4L70-E
$12837
Ships on 09/09/2026
Lowest Price GuaranteeForward Clutch Piston
Billet Forward Clutch Piston4L60, 4L60-E, 4L65-E, 4L70-E
The OE cast aluminum forward piston frequently breaks due to rough castings and high stresses. This billet aluminum forward piston eliminates these concerns by using high strength billet material and a design with added contours in the high stress areas. This piston can be used by itself or with Sonnax input housing reinforcement sleeve kit 77733-01K. No machining or modification is required to use this piston and it can be used in all 4L60/4L60-E/4L65-E as long as it is used in conjunction with an aluminum over run piston.
The OE cast aluminum forward piston frequently breaks due to rough castings and high stresses. This billet aluminum forward piston eliminates these concerns by using high strength billet material and a design with added contours in the high stress areas. This piston can be used by itself or with Sonnax input housing reinforcement sleeve kit 77733-01K. No machining or modification is required to use this piston and it can be used in all 4L60/4L60-E/4L65-E as long as it is used in conjunction with an aluminum over run piston.
- Eliminates concerns of forward piston breakage.
- Improved durability and strength over the OE's cast aluminum forward piston.
- Can be used in both early and late model transmissions.
Part TypeAutomatic Transmission Clutch Piston Dam
Product LineSonnax Billet Forward Clutch Piston
BrandSONNAX
Package Height1.5
Package Width6.7
Package Length6.7
Weight0.58 PG
Part CategoryReplacement Parts
Part FitmentSemi Universal
Vendor Part Number77764-01
Package Qty1
Package TypeEA
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