Stop Chasing 4R70W Direct Drum Problems

RAMP UP PERFORMANCE & RELIABILITY WITH THE

SONNAX ALL-IN-ONE UPGRADE


SMART-TECH® DIRECT CLUTCH DRUM & SHAFT KIT
PART NO. 76656-01K

For 4R70E, 4R70W, 4R75E, 4R75W and AODE transmissions.

Sun gear fits all 2.84/1.55 gear sets. Use a late AODE sun gear in place of Sonnax gear with 2.40/1.46 gear sets.

SMART-TECH® Direct Clutch Drum & Shaft Kit

The Smart-Tech direct drum and shaft kit ELIMINATES every critical weakness of the OE drum and is packed with all the parts you need for hassle-free rebuilds. It’s 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
Learn More Find a Distributor