A = January / M = December. The letter I is skipped.

04H = August 4, 1959. If it was September 4, it would be a 1960.

3 speed O/D not offered with 4WD.

If it was a Marmon-Herrington conversion, it would have a plaque screwed to the face of the dash showing how to shift the transfer case.

Your truck was originally a 1959 F100 2WD w/a 292 2V assembled in Kansas City MO. It was converted to 4WD by a previous owner. Who knows what the 4WD specific parts are from?

Besides the 3 speed O/D, the 5,000 lb. GVW (Gross Vehicle Weight Rating) is another 2WD dead give-away.

Factory F100 4WD would have a 5,600 lb. GVW (Gross Vehicle Weight Rating).

Edit: Spotted something else: Only 2WD Custom Cabs were available with a horn ring. All 1959/60 4WD's came w/a horn button.

These 4WD's rode and steered like oxcarts, no P/S was available until 1973, so a horn ring would interfere with steering the beasts.
------------------------------------------------------------------------------------------------------------------------------
Hey iBuzzard Bait: What the heck are you talking about inre to Internet Brands (IB)? Ken Payne founded FTE, sold it to Internet Brands (who has over 100 websites) several years ago.

Two Administrators of FTE are IB Tim & IB Carlene. So Internet Brands ain't over there, it's right here, kiddo.