Krebs is right, it's not locked. I just got off the phone with the canucks and they are outa stock and have to go to europe to find a new supplier. So it looks like I am in the market for a front 60 or 14 for the cheby. I have been goofiing off today and made up my own spreadsheet to calculate gearing and axle ratios with a doubler in. Its a mess but it works (I will post it up if anyone wants it, it is set up to calculate up to a 6spd tranny and 2 transfers. You just have to put in your gears.)