Overview

TransGo Oversized S4 Regulator Valve Reamers

TransGo oversized S4 regulator valve reamers are specialized, high-quality steel tools designed to re-size the S4 regulator valve bore in 2018-and-later GM 8L45 and 8L90 transmissions. They're used in conjunction with the oversized S4 valve kit to correct wear-related shift issues, clunks, and hydraulic leaks without replacing the valve body.

Additional details:

* Reams the worn valve body bore to accommodate the oversized hardened steel S4 regulator valve, restoring proper hydraulic seal
* Specifically for 2018+ GM 8L45 and 8L90 transmissions featuring the 2-land S4 valve design
* Fixes 1-2 or 1-3 harsh/slipping shifts, and clunking on coast-downshifts
* The tool includes a guide to ensure proper alignment and is reusable, reducing the need for expensive, dedicated machine fixtures

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