According to Hurst Driveline Conversions, there are a lot of decisions to make when swapping out a tired or less-than-desired transmission.
Many factors come into play and will affect your choice to rebuild, replace or upgrade. There are individual nuances, unforeseen difficulties, drawbacks and benefits to most every option available.
One of the greatest benefits of upgrading from a 3 or 4-speed to an overdrive transmission, the company reports, is the increased drivability achieved by lowering engine RPM’s at a given speed.
The process of determining what RPM you will be at in 3rd, 4th, 5th or even 6th gear may seem challenging. In recognition of this, HDC simplified the process by providing an RPM Calculator on its website to help sort through the mess and find the transmission that best suits your vehicle’s needs based on your rear tire size and gear ratio.