hi i have a 2003 28' carolina classic with twin kamd300A & HS63A-A 2.04:1 transmissions. I can't find any info on HS63A-A 2.04:1 transmissions?? who makes them ZF , hurth , volvo or ?????? is there a ZF part # i can lookup & get info on these? I need to change oil & filter + the cooler & i'm not sure of what i need cuz i can't find my model # anywhere for specs & parts. thank you mark