I put myself in debt and went with the Gear Vendors unit. I have 7 gears including the granny with my original 3:90 posi rear. It truly gives me the best of both worlds. I can run 80 mph at 2800 rpm in 4th over which is the same rpm as 60mph in 4th. One day I want to pull an airstream around the country. I believe this tranny combo with a beefed up 261 will be just the ticket.