Thanks for the info! So, anything with the mechanical speedometer is '86 or prior, which is what I've been looking for. The truck has the inline 6, but I'm not exactly sure what rear end it has, probably somewhere around 3:91 or maybe even 4:11 judging by how it quickly slows up when I let off the gas at 50mph, which is about all I'll get it up to. There are a couple on ebay right now that I'm looking into. The more info you folks provide, the more I'll know what questions I need to ask the seller. Thanks, again, for your help!