M30 Transmission
The M30 transmission is a variation of the venerable 4L60E transmission, and is manufactured by General Motors. It has four forward gears, the third of which is a 30% overdrive. M30 itself is a RPO code. It stands for: M30: TRANSMISSION, AUTO 4 SPD, HMD, 4L60E, ELECTRONIC There is a different RPO code for every … Read more