Jake,
The dipstick is for the tranny. .if you change oil it'll take around 6 gallons. The large hex plug is the fill hole and I'd use 80W-90 rather than 30 wt oil. As far as a wet clutch, you'd either have to post a serial number or just remove the access cover and take a look.
Normally the HT4 is to early to have an oil clutch. If it did there would be another dipstick up by your right foot and a big fill plug in the clutch inspection cover.
hey.. thanks for the info.. Probably wont change the oil , but I'd like to see a good amount on the dipstick.. 80w it is ! ...Now heres one for you. On my final drives do i fill those with 80w and how do i check the levels?
theres a sight plug on theside of trans so u dont have to keep reaching for the stick.