Originally posted by josephhh
OK I found the Gear Vendor's website. The gizmo looks like it is a transmission replacement with overdrive. Looks EXPENSIVE. I was envisioning a differential replacement. But what do I know....
It IS expensive. I put one on a tour bus a few months ago. It helped fuel consumption, and engine wear, but cost almost $1800.00, but a two-speed rear end is much more. Even a used rear end is a ton of money, and then you have to pay to make it fit.
What transmission do you have in your rig now? And what ratio rear end do you have now? And, what engine? You may just be able to change gears in your current axle, without having to resort to major, expensive surgery.