I am sure this is one more for JIML82 to answer - I purchased on ebay what was supposed to be steering box from a 1998 Jeep Grand Cherokee with 80K miles from a salvage yard that supposedly only deals in Jeeps. Upon arrival, I cleaned the end cap and the alpha code read BH clear as day. According to Jim's power steering pages, BH refers to a 1970 A-8 SWagon so I decided to take some measurements.
First of all, the input shaft is 3/4" which is correct for a late 70's plus gear as I understand it (not a 1970 wagon).
Lock to lock, the input shaft rotates 3.37 turns.
Lock to lock, the pitman arm sweeps 84.5 degrees.
By my calculations, that means I have about a 14.3:1 ratio box (assuming it is a fixed ratio) which doesn't match the 1970 wagon or the Jeep GC.
I made all of these measurements twice via two different methods and they were exactly the same both times.
So what box do I have exactly?
I wanted a GC box or equivalent so do I have enough information to argue that the seller should replace the box at no additional cost to me?