[Classic Heartbeat]

If it is the dana 60 that nobody has messed with, it should have a tag bolted to one of the bolts on the inspection cover that will tell you what the ratio is. Most trucks with your combination came out with 3.54 Dana's in them, but that is not always true. Especially with the custom ordered trucks. If it is the eaton rear end (best identified by the round inspection cover and the drop out front gear set), there will be a set of numbers stamped in the front housing on the top cooling fin on the right hand side of the gear housing. If you have the first three letters I can get you the ratio by looking in my GM parts catolog. Then last but not least, if you have a possi, or track lock rear end the ratio should be posted on the glove box option sheet. WES www.ClassicHeartbeat.com