Stop Chasing 4R70W Direct Drum Problems

RAMP UP PERFORMANCE & RELIABILITY WITH THE

SONNAX ALL-IN-ONE UPGRADE


SMART-TECH® DIRECT CLUTCH DRUM & SHAFT KITS

SMART-TECH® Direct Clutch Drum & Shaft Kit

The Smart-Tech direct clutch drum and shaft kits ELIMINATE every critical weakness of the OE drum and are packed with all the parts you need for hassle-free rebuilds. They're an unbeatable upgrade for any vehicle pushing the limits of the stock drum, PROVEN to easily handle even the most extreme horsepower and torque.


  • One-Piece Design

    Eliminates weak point where drum splines strip & shafts break.


  • Rugged Shaft

    50% thicker & 2X as strong as the best 300M shafts.


  • 17% More Clutch Capacity

    Custom drum & piston hold one extra friction for optimum protection against burn-up.

Sonnax vs OE direct drum and shaft comparison

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