The Speedmaster PCE223.1008 Adapter Ring is designed to mate a GM TH400 bellhousing to a Speedmaster TH400 transmission case, providing a reliable and precise interface between the two components. This adapter ring simplifies your transmission build or swap by bridging compatibility between OEM GM bellhousings and Speedmaster's TH400 case.
Engineered for enthusiasts and builders working with TH400-based drivetrain combinations, this adapter ring helps ensure proper alignment and a secure fit. If you're assembling or upgrading a TH400 transmission using Speedmaster components, this is the dedicated solution to complete the job correctly.