The crank seal in a TR/TRA10D is in the stator plate,it's held in by 3 bolts and usually comes out pretty easy.You have to get the flywheel off,then take the stator plate out,it's pretty simple.There are gaskets behind the stator plate that set the crankshaft end play,so you might want to get on or two when you get the seal,I've had pretty good luck on those reusing the old ones but you don't want to just use silicone sealer or something like that if you ruin one because it can make the crank run tight and ruin the bearings.