[Mike C]

What are you trying to find out? If you have 4.10 gears? Or if your truck was originally a 6 banger?

2 wheel drive or 4 wheel drive? If you have a 4 wheel drive truck and no one has really messed with it, look for the Dana ratio tag on the front axle. It is under one of the cover bolts. Unless some moron PO took it off and didn't put it back... It will be a number like 10/41 which is 10 teeth on the pinion and 41 on the ring gear. So 41 divided by 10 (I think it is backwards on the tag but don't recall. On some newer ones they stamped the ratio. Or maybe I'm confusing early Jeeps? is 4.10.