[cletrac (RIP)]

I was trying to figure out an approximate build date for this F15A so I made this list of all the 3G prefix Ford engines that I could find. It looks like it was in the first 100 or so Cab 13s produced. The build date would have been in Feb 42.

3G-7606 30834 Cab 12 F60L Keith Webb
3G-7674 31343 Cab 13 F60L Keith Webb
3G-7753 F15 David Pope
3G-19676 37206 Mar 13, 42 F60S Keith Webb
The next two motor and chassis #s are in sequence but
the Aussie build dates aren’t. Could it have taken two years
before they were reassembled in Australia?
3G-19974 36772 Jul 3, 44 Tony Smith
3G-20006 36830 Jun 13, 44 Keith Webb
The chassis # on the next one seems like it should be 38048.
3G-20324 68048? Mar 17, 42 F60 Keith Webb
3G-20539 39311 Mar 23, 42 F60 Reynolds museum
3G-20797 38766 Mar 19, 42 F60 David Pope
3G-21223 39246 Mar 23, 42 F60 David Pope
3G-22346 40728 Mar 27, 42 F15 Reynolds museum
3G-22352 40732 Mar 27, 42 F15 Reynolds museum
3G-22568 40737 Mar 27, 42 F15 Reynolds museum
3G-28372 47278 Apr 30, 42 F15 Reynolds museum
The rest have me wondering what gives.
3G-31287 124812 Mar 2, 45 F60S Tony Smith
3G-34578 185091 Aug 25, 44 F60S Keith Webb
3G-42680 50481 Jan 3, 44 F60L
3G-43991 Aug 18, 42 Keith Webb
3G-51651 117810 Feb 19, 43 F15 Canadian Reg
3G-60423 May 30,44 Keith Webb
3G-66964 109943 Jan 13, 43 F15 Hanno Spoelstre
3G-69839 113211 Jan 27, 43 Canadian Reg
3G-72000 July 6, 44 Keith Webb
3G-72245 121735 Jan 8, 45 F60S Keith Webb

In 10 days from Mar 13 to Mar 23, 2105 chassis were produced or 210 per day.
In 4 days from Mar 23 to Mar 27, 1417 chassis were produced or 353 per day.
In 34 days from Mar 27 to Apr 30, 6541 chassis were produced or 192 per day.
In 48 days from Mar 13 to Apr 30, 10063 chassis were produced or 210 per day.

If anybody has any more 3G prefix data info I'll add it to this list.