The GF4A uses a standard-of-the-industry 32 spline output shaft and can be had with nearly any input shaft desired. The transmission can be built with virtually any ratio combination required and because all gears are directly interchangeable, ratio changes are seemingly effortless. Both the main case and tailhousing are cast of high-quality magnesium and are strategically reinforced for added strength. All cases and tailhousings are coated for surface protection and ease of cleaning. Any standard H-Pattern shifter can be used with the GF4A, but Long Shifters are highly recommended to extract the maximum performance from these transmissions.
To add to the versatility of the GF4A, an internal oil pump can be fitted directly to the transmission case which eliminates the need to have a stand-alone oil pump to circulate oil through the transmission and cooler. This pump is gear driven via the counter shaft drive gear which improves efficiency and greatly reduces the likelihood of pump failure due to broken drive belts.