Fatman Parts

Garage

No vehicle selected

Add your ride before you shop for smarter fitment warnings.

Factory diagram — Muncie CH & SM-465 4 Speed

Factory diagram — Muncie CH & SM-465 4 Speed

Factory diagrams

GMC

Hydromatic M20 Trans Assembly

UsedOEM

OEM GMC Hydromatic M20 Trans Assembly part #15589818

Verify with VIN

Close match — verify with VIN before checkout. VIN check beats regret.

Estimated Dispatch

Ships in 24–48 hours

$1,275.00

Fitment
Guaranteed fit
Shipping
Fast U.S. shipping
Returns
Easy returns
Support
Real support

Specifications

SKU

FTM-CHARM-15589818

OEM Part #

15589818

Shipping Class

ground

Warranty

—

$1,275.00