transaxle fluid?

i have a 04 craftsman 20hp lawn tractor.
i overheated the trany pulling an aerator.
it runs ok now that it has cooled down, but i lost some fluid when it overheated. it actually melted the vent tube. i removed the rearend, and i want to change the fluid.
i cant find info on the type and amount of fluid to put in it. the manual says 80w90 for the gearbox, but nothing about the trany?? i read a post from peerless that said to use Mobil 424 but no amount.
its a 2000-002B peerless Tecumseh , the label on the trany says 6845p91 and there is a stamping on it that says 6733P1 (R)

any help is appreciated.
Thanks

 

I use synthetic 20w-50 oil in these. I don't know how much it will need, but probably less than a quart. I have filled them to overflowing and the reinstalled the plug and run them without problems.

 

Just to lend a hand Mr Cheese.....





Good Luck