Derek, LAATs were just one type of body style fitted to 134"wb trucks. Therefore, all C30's or C60S's are not necessarily an LAAT.
I think I read in an earlier post that your truck is a Chev? OK, let's look at that.
1. What type of steering knuckles are fitted to the front axle? If the Kingpin plate has 6 bolts on top, it is the "Large" ot 6 inch steering end. Your truck is probably based on a stretched C-GT or SHORTENED C60L.
2. If the Kingpin plate has 4 bolts ("Small" or 4 7/8ths inch steering ends), your truck could be a stretched C15A or a C30. (A small number of 60cwts had Small steering).
3. Now look on the diff 3rd member for any stamped, not cast numbers, that should indicate the gear ratio. If you find the numbers 6:39, this is a C15A diff. If you find 6:43, this is a C30, C60S/L or C-GT diff.
4. ALL Chev 101" chassis had the winch crossmember, MOST 134" chassis had the crossmember and SOME 158" chassis had the crossmember. Fords were more sparing with the winch crossmembers, only fitting them to trucks so specified in the contract. To find if the winch was fitted originally, look for other signs like evidence of roller fairleads at the rear crossmember, or cable "Pigtails" on the inside of the frame rails.
5. All 13 cab Fords and Chevs had the spring mount under the rear of the cab. (HUPs or other specials? Dunno!)
6. None of this is a surefire way to ID your truck as any components may have been swapped out in the 60 year life of your truck or during it's apparently professional rebuild.
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