Sorry to revive an old thread but I just bought my 92 Ranger and it has the Paxton on it. No idea of specs. The gentleman who owned it previous passed away last year. The supercharger is currently unbelted. The 4.0 has headers and an MSD DIS-4 ignition but that's all i can tell you for certain. I suspect it may have a slighty warmer cam than stock also. Running as is it will break the new 35" BFG M/T's loose on take off. 65mph at 2400rpm so it not geared all that short either. I don't know much about supercharger's so I'm trying to find out more before i put the belt back on it. When it was sold to me they said it had been unhooked due to fuel mileage but worked fine still. Time will tell.