Hi, Haley,
You didn't say what kind of rear end your truck is running, but I know that the early Nova station wagons used a 3.36 10-bolt 8.2" rear end gear set, because I have an early Nova wagon. If your truck uses the 10-bolt 8.2" gears, it should be a fairly easy swap, and you can get the ring and pinion from Jeg's or Summit Racing or if you're up on GM codes, from a bone yard. A lot of other GM cars used the same gears besides the Nova wagons, but I'm not sure which ones just off the top of my head. Should be fairly easy to look up with a little research, though. If you're looking for gears for mileage, all 6 cyl Novas other than the wagons came with 3.08 gears in the rear end, as well as standard Chevys with 6 cyl engines.
