The Borg Warner 310mm LU (A618, 47RH/RE, 48RE) piston damper cores are becoming scarce. After several rebuilds, the material supporting the friction material becomes weak, and deflection could result in failure. The Sonnax fully machined piston allows for a stronger and more durable replacement. The hardened bore reduces galling of the seal bore. Sonnax piston plate BW-DA-3P adapts to the OE damper assembly using BW-RV-2 rivets.

Machined from a steel billet
Increased wall thickness for greater stiffness
Hardened bore to reduce galling
Lockup surface machined to specific requirements for bonding

More From This Category

ARP Studs, Water Pump Pulley, 12-point Head, 3/8 in. Wrench, 8740, Black Oxide, 5/16 in.-24 Thread, 1.75 in. OAL, Set of 4

ARP Studs, Water Pump Pulley, 12-point Head, 3/8 in. Wrench, 8740, Black Oxide, 5/16 in.-24 Thread, 1.75 in. OAL, Set of 4

$46.47

ICON Piston, 4.25 in. Bore, For Chevrolet 454 Rod 6.135 Hollow Dome, -27cc 1V, .030 Oversized, w/ Rings, Each

ICON Piston, 4.25 in. Bore, For Chevrolet 454 Rod 6.135 Hollow Dome, -27cc 1V, .030 Oversized, w/ Rings, Each

$1,686.83

Water Outlet Gasket,

Water Outlet Gasket,

$0.94

Haltech Merchandise Haltech x BridgeMoto Race Gloves Size: L

Haltech Merchandise Haltech x BridgeMoto Race Gloves Size: L

$250.00