Sonnax BW-SD-3 outer springs are for the BW 310mm LU (Chrysler A618), 47RE and 48RE Cummins diesel. These springs replace worn and weak OE springs that may have taken a set.
The much weaker .162" wire outer springs used in A618, 47RE dampers have long been know to bottom out in TC clutch engagement. This harsh clutch engagement may eventually cause the turbine shaft to break along with other transmission components. Chrysler upgraded to a larger .177" wire diameter outer spring on the 48RE. Although this spring has a 43% increased damper capacity over the earlier version, it is still prone to bottoming out, especially if the diesel engine is chipped or modified for greater torque.
Improves performance of earlier two stage damper
15% More damper torque capacity than the OE 48RE Springs
65% More damper torque capacity than the OE 47RE Springs
One damper assembly requires 8 outer springs

More From This Category

Sonnax Roll, Allison, Ht700 & Mt644/654, Each

Sonnax Roll, Allison, Ht700 & Mt644/654, Each

$4.48

Sonnax Turbine Hub Insert, GM 298mm, Each

Sonnax Turbine Hub Insert, GM 298mm, Each

$29.85

Sonnax Impeller Hub, ZF, F&S ZF4Hp18, Each

Sonnax Impeller Hub, ZF, F&S ZF4Hp18, Each

$24.37

Sonnax Outer Piston Seal, Ford 6R140, Each

Sonnax Outer Piston Seal, Ford 6R140, Each

$21.09

Sonnax Oversized Tcc Modulator Plunger Valve Kit, 5R55W/S O/S Sleeve, Each

Sonnax Oversized Tcc Modulator Plunger Valve Kit, 5R55W/S O/S Sleeve, Each

$44.69

Sonnax K1 Apply Boost Valve Kit, Aisin Seiki, AS66RC, AS69RC, Each

Sonnax K1 Apply Boost Valve Kit, Aisin Seiki, AS66RC, AS69RC, Each

$61.86