Increase Clutch Capacity, No Modifications Required
The physically larger clutch pack area in the Sonnax drum kit increases capacity by 20% when using six OE-thickness frictions and steels. Using OE-thickness steels maximizes heat dissipation to prevent burnt clutches.
Prevent Clutch Drum Breakage
The manufacturing process of the OE snap ring groove creates high-stress points around the circumference of the forward drum. The drum is active in 1st, 2nd and 3rd gear ranges and suffers the most abuse on a forced 4-3 kick down when it reapplies at higher pressure. The concurrent pressure from the forward clutch piston combined with the high stress at the snap ring groove causes the upper portion of the drum to split and separate at the groove. Depending on severity of the crack, this can result in no forward engagement or slipping in 1st, 2nd and 3rd gear. The one-piece, forged Sonnax drum kit is more durable than stamped drums and features increased groove depth for additional ring support. These are the same features found in the Smart-Tech standard capacity drum 76654-01K.
- Increase clutch capacity by 20% without removing the wave plate
- One-piece, forged drum design prevents cracking
To replace an AOD cast forward drum requires updating related components with AODE versions. Update forward clutch pack with AODE style friction, steel and waved plates, backing plate and retaining ring. Additionally, do one of the following: either machine tips of reluctor from forward drum; OR update sun gear shell and reverse drum with AODE versions. See warning regarding riveted sun gear shell.
- Drum High Capacity
- Bottom Steel Plate .055″ Thick
Cannot be used with ’04’-05 riveted style sun gear shell. For applications with front speed sensor and riveted style sun shell, replace sun shell with later design without rivets (OE Part No. 5L3Z7A019AB) or aftermarket equivalent.