I have JD Grader 772D model 2009 and now the engine oil mixing with transmision oil. is that from the rear housing. if i am right please provide me with part number
yep, your rear crank seal is leaking. The torque housing is a wet housing(supposed to have trans oil in it) and this is why they mix. Common problem,nasty repair job. Dont forget to used form-a-gasket when you mate the engine back to the trans.