There was another PTO, albeit from a 15cwt. The chev 15cwts had a PTO on the transmission for driving the water pump on the water trucks. I'm not sure if any of the larger tank trucks used this PTO, or simply the one off the back of the transfer. case.
We used to pick up those transfer case mounted PTOs from Princess Auto in Winnipeg. I still have one somewhere wrapped in preservative...I think they cost $5.
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