ATP Parts SM-11 Automatic Transmission Overhaul Kit

Automatic Transmission Overhaul Kit for GM Applications

ATP Parts SM-11 is an automatic transmission overhaul kit for rebuilding select GM transmissions. It brings together the core sealing and friction components needed for a transmission service job, with OE-style fit and function for long-term durability. This kit is a direct match for many Chevrolet C10, GMC C1500, Buick Regal, and related applications.

Key Features

• Automatic transmission overhaul kit for service and rebuild work
• Includes friction clutch plates, seals, O-rings, gaskets, and sealing rings
• Engineered to fit and function like original parts
• Built for rebuilds on a wide range of 1979-1986 GM cars and trucks
• Part number: SM-11

Detailed Description

ATP Parts SM-11 is a transmission overhaul kit built for automatic transmission rebuilds where sealing integrity and clutch performance matter. It is used across a broad range of Chevrolet, GMC, Buick, Oldsmobile, Cadillac, and Pontiac applications, including Chevrolet C10, GMC C1500, and Buick Regal models. The kit is suited to rebuild jobs that require replacement of paper gaskets, pan gasket, rubber O-rings, lip seals, metal-clad seals, sealing rings, and friction clutch plates. This part cross-references BBB Industries 19029 for the same application.

ATP components are made to match original part fit and function, helping restore proper transmission operation after service. If you are rebuilding a GM automatic transmission from the late 1970s through 1986, SM-11 is a practical OE-style service kit to have on hand.

What It Helps Fix

• Transmission fluid leaks at gaskets and seals
• Slipping or inconsistent clutch engagement during rebuild service
• Worn sealing rings and O-rings that affect hydraulic pressure
• Pan gasket seepage after transmission service
• General wear found during automatic transmission overhaul work

Installation Notes and Tips

• Verify transmission type before ordering; some listed vehicles note THM350C, THM250C/M31, or THM350-specific applications.
• Match the vehicle year, make, and model exactly to the fitment list before installation.
• Inspect hard parts, clutch drums, and sealing surfaces during teardown so the rebuild is completed correctly.
• Clean all mating surfaces thoroughly before installing new gaskets and seals.
• Use proper transmission assembly procedures and fluid specifications for the vehicle being serviced.

Quality Assurance

ATP Parts states that its components are engineered to fit and function like the original parts for long service life and durability. SM-11 is built as an OE-style overhaul kit for transmission rebuild work across confirmed GM fitments.