I've been doing some digging and have come across two complete rear ends with 4:88 gears! They're around $5-700 each before shipping. That's cheaper then I was expecting. Once I'm back to work a whole rear end will be high on my list. If my calculations are correct I should be able to cruise at 70 mph while spinning around 2900 rpm which is perfect. I have more digging to do to find out what low gear it would be paired with. Currently with the 6:50 I have no use for first gear so I should be perfect.