One of our most popular services for Classic American cars and Muscle cars is the 5-speed transmission swap. These days we are finding that even our most conservative of collectors are looking to add some modern performance to their classic cars. One  convenience that we take for granted on our modern cars is an overdrive gear on our manual transmission. In a nutshell, the transmission acts as the intermediary between the engine and the final drive gears in the rear end allowing the driver to use different ratios for acceleration at different speeds. Back in the day, manual transmissions were not offered with any type of low gear so when the car was cruising at a constant higher velocity, the RPMS would be pegged. This final low gear is beneficial as it reduces the RPMs, reduces noise, and improves fuel consumption greatly. In terms of performance, a transmission with a over drive gear allows for closer spacing in between the first four “higher” gears which provides greater flexibility.

So where does Keisler Engineering come in you ask? Keisler offers the Tremec TKO 500 and TKO 600 in kit form for your particular car. These guys don’t just send you a transmission  while you cross your fingers and hope that you will be able to put together all of the other parts to make the transmission work in your current ride. After determining your current year/make/model, engine set up, horsepower, rear end set up, tire size etc… Keisler provides a custom set up for you that will suit your exact needs, and fits perfectly. All the parts you need to make the transmission swap come from Keisler including the driveshaft. We’ve never had an issue to speak of and the parts quality is second to none.