Smart-Tech Drum Module for GM TH400 Automatic Transmission w/o Front Band

Name: Smart-Tech Drum Module for GM TH400 Automatic Transmission w/o Front Band
Brand: SONNAX
SKU: 852-34555-01K
Price: 3052.40 USD
Availability: InStock

^$3,052⁴⁰

Ships on 09/15/2026

Lowest Price Guarantee

Smart-Tech Drum Module

Fits GM TH400 (Turbo 400) Without Front Band

Over 3.3 lbs. Weight Reduction

Replaces Forward and Direct Drums

Larger Diameter 36-Element Sprag and Race

6-Friction Forward Clutch Pack

7-Friction Direct Clutch Pack

Sonnax 34555-01K Smart-Tech Drum Module Includes:

Forward Piston Housing
Forward Piston
Forward Piston Return Springs (16)
Forward Spring Retainer
Forward Snap Ring
O-Ring: 1.674 in.
(2) Lip Seals
Direct Housing Assembly
Direct Piston
(26) Direct Piston Return Springs
Direct Spring Retainer
Direct Snap Ring
O-Ring: 2.737 in.
Sprag Shaft
Front Sprag Retainer Plate
36-Element Heavy-Duty Sprag
Outer Sprag Race
Rear Sprag Retainer Plate
(4) Sprag Retainer Screws
(2) Quad Ring Seals
(2) Anti-rotation Seal Rings
Drum
Pressure Plate
(4) Outer Snap Rings
Bearing Small
Forward Clutch Hub
Bearing Large
(4) Direct Clutch Hub Steel Clutch Plates: .060 in.
(11) Steel Clutch Plates: .077 in.
(13) Friction Clutch Plates: .080 in.
(60) Clutch Separators: .103 in.

Clutch Drums With Less Parasitic Drag and Improved Heat Dissipation

Sonnax Smart-Tech Automatic Transmission Clutch Drums will increase rear wheel horsepower with less parasitic drag, reduced rotating mass, and by creating less heat for greater longevity.

Part TypeAutomatic Transmission Clutch Drum

Product LineSonnax Smart-Tech Automatic Transmission Clutch Drums

BrandSONNAX

Package Height8.3

Package Width13.7

Package Length14.8

Weight25.29 PG

QuantitySold as a Kit

Transmission Drum MaterialChromoly Steel

Vendor Part Number34555-01K

Package Qty1

Package TypeEA