Could be a 9 1/4" or a 8 1/4" either way as well. If both are the same, you could swap the axles for the correct bolt pattern. If not the same, your pinion length will probably different and I think your driveshaft will be a problem. The 203 T-case has a bolt on yoke and the driveshaft will have the slip built in. The 208 will have a slip yoke with a solid driveshaft. Guess you'll have to see what you have when the truck shows up.