The fill plug is same plug on top by the shifter as for the transmission. I am thinking 90 wt. gear oil, someone will correct me if I am wrong. There are 2 level check plugs. I am thinking the rear one is on the right side of the transmission above the brake pedals and I think the front one is on the same side toward the front about 2" higher for the T/A compartment. You won't see any oil at the front plug unless the tractor has been driven for a while and there is enough oil in the front compartment. The oil is slung off the gears, flows through a channel to the front T/A compartment to lube the T/A and runs back through the bearings to the transmission when the unit is stopped.
 
First be sure to drain both compartments. The trans diff on the bottom of the diff and the ampli-torq on the left side at the bottom approx straight down from the front of the left step. The filler plug on the right side is the same opening as the adjusting hole for the ampli-torq clutch. There is a level plug on the same side below that. FILL THIS FIRST. Then fill the trans diff. through the plug on top of the shifter cover. That level plug is on the right down in behind the brake lock. If you don't drain both areas you will leave a supply of old fluid and sediment in the system and if you don't fill both areas separate, and fill only the trans-diff, the torq will run dry for a long time before the gears fill that compartment, and then the trans-diff will be low.
MMDEL
 

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