Monster Transmission Blog: Transmission Tech, Upgrades & How-To Content

4L60E Transmission Common Problems Beginning in the late 90s and the early 2000s, GM began to phase in a new variant on the 4L60E, the 4L65E. This transmission introduced a new set of 5-pinion planetary gears as well as a newly improved and stronger output shaft. This gave the transmission...

4L80E Transmission Common Problems Despite its name, the 4L80E is not an upgrade to its GM counterparts. Introduced alongside the original 4L60 in the early 1990s, the 4L80E is designed for large trucks and is designed as a heavy-duty unit rather than a transmission for smaller cars or even some...

6R140 Transmission Issues: What Ford Owners Should Know Beginning in the mid-2010s, Ford introduced the 6R140 transmission, a significant advancement in their lineup. This transmission features a robust 6-speed automatic system designed to enhance performance and durability. Key improvements include using advanced materials and engineering techniques to create a stronger...

Common 6L90E Transmission Problems and How Monster Fixes Them The 6L90E transmission fills a much-needed duty gap between the versatility of the 4L series and the Allison variety. All previous GM transmissions were based on hydraulic controls, with more electrical aspects with each upgrade, but this unit was developed as...