300M Main Shaft – 4L80E (99+)

For over 40 years Transmission Specialties has been the trusted name in the performance automatic transmission industry. TSI has pioneered much of the technology that is now commonplace in the transmission marketplace. The inventors of the spragless converter and the aftermarket helical Powerglide planetary, TSI is known worldwide for manufacturing and assembling the highest quality transmissions and components. . 4L80E 300M Main Shaft 99 & Up