I changed the oil and filter on my 03 ultra classic and now i have a noise in the trans -sounds like the case is dry but the dip stick is on the full mark . is there a fill plug just fore the trans?

limited info generic answer -unknown model -engine --well every type of fluid fluid is at the back of engine going with a full size 1 - coolant heater hoses..overflow tank.. 2 oil valve covers..main seal ..dip stick..oil filter--pan ---3 trans trans lines -pan-torque conv-dip stick--4 brakes master cylinder--lines-- determine what color then check around that component

Crank case vent clogged?

He either added the trans fluid to the engine oil or he is checking the wrong dipstick. CHECK THE ENGINE OIL LEVEL to see that the trans fluid is not in the engine. If the engine oil is full of trans fluid, do NOT START the car and now you need to change the engine oil and also add the trans fluid to the trans. If engine opil is ok, be sure to find correct dip stick for trans fluid. They should be marked accordingly.

if there is a faulty seal on the crankshaft then the gear oil can get to the crankcase
being a separate case with separate oil, check that the breather for the transmission is not blocked and the pressure build up is not forcing the oil past the seal into the crankcase

First off, determine if it's transmission fluid, or primary chain case fluid.
I had the seal on the transmission main shaft go on me once (the seal under the transmission rear drive pulley, behind the inner primary cover).
This can be changed with the transmission still in the bike, but the entire primary needs to come apart, and the transmission sprocket/pulley removed to access it.

If it's primary fluid, it's probably the seal on the inner primary case that the transmission shaft runs through and that the clutch assembly bolts to.
Again, the entire primary needs to be torn down to access this.

Either way, the cost of the part isn't bad, but the labor is the killer, as it's a 6-10 hour job, if I remember the book's quote.

look on dip stick you should see cross hatched area with add oil or oil full mark.if you wipe oil dip stick with a clean paper towel and dip stick look dry no sign of oil add little oil at a time see if oil level reach add oil mark or the full mark.if oil is low. low oil light will turn on if bulb is blowed but if dip stick look dry oil level could be low,add little bit at a time dont over fill.

The oil tank is on the bottom of the transmission. The engine oil drain plug is on the left front corner of the oil tank. Drain the oil, change the oil filter, and refill with three quarts of any approved 20W50 weight engine oil. Check the oil level using the dip stick. The dip stick is located on the right side of the transmission. The oil cap is a large cap (2" or 50mm in diameter) with knurled edges on it. The dipstich has two marks on it. The top mark is 'FULL HOT" and the lower mark is "FULL COLD". Keep the oil level between these two marks. Check the oil level with the bike on the side stand.

Good Luck
Steve

Make SURE you have enough oil in engine, check dip stick. Make sure oil is not leaking from drain plug or oil filter.

Use 1 quart of 75-90 gear oil. I use Mobile 1 full synthetic.