Talked with one of my old mechanics from shop we closed in 2008. We both could recall
having worked on the particular truck, but are at loss for your specifics.
We know you use a hydraulic oil in the hydraulic system. We used AW32.
As far as we could recall, the truck has a hydraulic tank for hydraulics.
Transmission sump was its supply. Drained from a bottom plug, and added, filled, or
refilled from dipstick port or a plug close by.
We know we used Dexron in the transmissions of the ones we serviced. May be necessary
to hand/eye trace lines from hydraulic tank to determine if common.
Sorry for delay and no firm assurance. A lot of the older stuff depends on fallible
memories.