[Cashburn]

The most common rear ratio in production over the years has been the 3.46. The early years the 3.15 was pretty common. Today we see a healthy mix of 3.73 and 3.46, though a 3.15 will come through on occasion. In those cases we often swap it at our shop to match it to the engine and transmission better AND we select the OD of the TKO600 based on this as well.

We had a big block years ago that was fantastic with the 3.15s though.

If you setup the 3 properly when building your car you will use all the gears.