As we started using available gear ratios with the 3.8L GT4 cars they worked fairly well, but not perfectly (speaking from a perfectionist standpoint) RPM drop and spread as the power was increasing with the 3.8L but still a major improvement over the stock setup.

So, DeMan Motorsport has developed an exclusive gear setup where the Main shafts and ratios PERFECTLY match to our large displacement high HP and TQ engines for a gearbox that will rival the PDK for close gear spacing and linear acceleration!

After studying lots of data, video, and soundtracks of these cars running through the gears we have come up with the BEST GT4 gearbox combination ever!

DeMan Motorsport Gear Ratios 4.5L GT4