Original Tire Diameter on a 1973 CJ5?

I think this is an easy question. I was hoping someone could tell me the original tire diameter on my 1973 CJ5. I'm running 33" tires with a 3" lift and I'm trying to make a decision on which gear ratio to use. The jeep has the original 3.73 gears, and I'm trying to
decide whether to run 4.27's or 4.56's.

 

probably 29"
whatever an L78-15 Goodyear Suburbanite measured...

 

27.5" IIRC. Less than 29", for sure. Timgr will know.

 

Pretty sure it was H78-15 Goodyear Polyglass Suburbanite, not L78-15. Someone could check one the sales literature frm thos years to be sure. My reference http://www.geocities.com/MotorCity/2398/tires/tirediam.htm says the H78-15 was 28.34" in diameter.

Note that you could get smaller tires from the factory, but where I worked, only the larger tires had any value as take-offs, so they never ordered CJs with the smaller tires. I'd expect the large majority of the Jeeps sold came through with the optional larger tires.