[vectorit]

The splitter gives you more gears to shift into, so it can be very beneficial when towing.

It's just a miniature of what is in the big rigs.

This 1967 is set up just like my 1968, except mine was ordered with the 327 v8 engine. Your Eaton gear ratio is more than likely .457 like mine, so it is all about low speed power. When it comes to highway speeds, the best mine and yours does is about 65 MPH. Even at 65 MPH the truck is working hard, and you are using more fuel than needed. So, 55 MPH is a good all around speed with out over doing things.
This splitter would give you more gears on the top end, so it's like turning that SM465 into a 6 speed I think.