All dual disc come standard with 1.375 hubs

Trucks with OEM 1.25 input shafts must order input shaft kit VA1.375K or VA1.375B

Quiet Dual Disc Kit - up to 550HP
Organic Facings
Nodular Iron Flywheel and Billet Floater plate
Pressure Plate Load - 3400#
Kit includes: New Nodular Sprung hub Dual Disc Flywheel, 3400# Pressure Plate, Organic Clutch Discs, Release Bearing, HD Pilot Bearing, Modified Clutch Fork, Bolt Kit, starter spacer and Alignment Tool.

This Quiet version will eliminate the floater plate rattle when the clutch pedal is pressed in. It will not get rid of gear rollover noise.

If you have a Stock - 500HP truck and tow alot this is the only way to go. This clutch has a smooth engagement.