What is a Hi Stall and why do I need one?

Before we can answer what a Hi Stall is we first need to know what a Torque Converter is, Wikipedia defines a Torque Converter as a type of hydrodynamic fluid coupling that is used to transfer rotating power from a prime mover, such as an internal combustion engine or electric motor, to a rotating driven load. The torque converter normally takes the place of a mechanical clutch in a vehicle with an automatic transmission, allowing the load to be separated from the power source. It is usually located between the engine's flexplate and the transmission.

Modern 6 speed automatic transmissions, how strong are they?

We are one of the only manufacturers of Hi Stall converters for the modern 6 speed automatics and we see a lot of interesting things and hear a lot of interesting stories about what you can and can’t do with them, so I thought this would be an interesting topic to discuss.

Firstly the GM (6L80E) and Ford (ZF6HP) transmissions are very similar, it appears that in usual style for the two marquees, Ford has opted to by the transmissions outright from ZF while GM has chosen to only buy the design and manufacture their own. In reality they are essentially the same transmission wrapped in different cases. The converters are totally different with GM sticking to its proven design philosophy’s in the torque converter and Ford choosing to use the ZF unit which is like most German units in that it is difficult to work on, hard to get parts for and expensive to fix.