Hello again Checked two of my service manuals for this machine and they couldn’t describe exactly what the two transmission dipstick’s were exactly. Also can’t remember what the old man told me they were. 
need some assistance on oil check dipsticks. Pull the dipstick that’s just a head of the hand clutch on the floor plate and it was an inch over the full mark with the off-white milky colored substance not good.
Second dipstick is beside the shifter lever I’m assuming that one’s transmission correct me if I’m wrong. 
It was about a half inch over the full line and resembled more of the oil itself. Now it’s kind of baffling to me is this tractor is stored inside a non-heated garage, in the fall of 2018 was the last time does tractor would’ve sat outside for a two day tractor show and consequently going back from that year maybe eight for same two day show.
Of course that was too long ago but it always seemed like we got rain at some point another during the show
thanks again for the input great source of information
 

you can get condensation too. drain it and fill with the recommended oil. the one dip stick could be for the wet clutch. some machines had a wet clutch. heres a thought has the coolant level changed you might have a leak.
the trans has to be idling in neutral when you check the oil same with the main engine well i know the d4 u series is like that. its stamped on the dipstick.

Woo there train read your book again, and the dip stick. I only check transmission and wet clutches when the engine is off, before starting. The engine oil says check with engine running but not the others.

Condensation is rather hard to understand, as to how much water will accumulate. Inland central California is known for low humidity most of the year. I got a D6 from the Carrizo Plain area average rainfall is 7 inches and the tractor was in a old barn. But as rusty as any tractor I have dealt with.

a shed with a dirt floor will have more condensation and moisture than a concrete floor. its weird but having a roof draws the moisture. you park a vehicle on the lawn for a few days it will make that spot really green but them it kills it off.

Thanks for the replies this machine is on the concrete floor in the non-heated garage 
I do remember now dad telling me to check oil levels while machine is running but the first dipstick that’s just a head of the hand clutch lever is that The wet clutch level and like I said right now it’s a milky white

Radiator is good in green and green could be , appears to be at the same level that it’s always been from years gone by

Thanks Neil if I’ve researched previous posts on this site there should be a drain plug at the bottom of the bell housing and can you advise on the same oil as transmission or not

Far more debate about transmission oil, but in the old days always gear oil. Then in 60 to 70 time Cat went to the same oil in most if not all compartments. But have gone back to gear oil for the older machines. In the 50's when the wet clutch was new engine oil was the Cat recommendation. I think that is still true.