By "sealed" I'm fairly confident that that means that it hasn't a dipstick to check fluid levels or re-fill. This is consistent w/ BMW (the only one I have experience with) where in order to "check" the fluid level, you have to remove the pan and measure the amount of oil coming out. Of course, that means that you have to drain the torque converter also, which is a PITA. There is an access hole (a bolted hole essentially) to install new fluid but that also is a PITA to get to. Either way, being that nothing is perfect, seals do weep and eventually the fluid level gets too low. Is how a friend got a very nice 2000 5 series for cheap. The owner was quoted several thousand for a new tranny 'cause it was slipping, and sold it to him. He put the thing in the air, found the bad seal, fixed that, replaced the fluid and it was fine (the guy is a whiz mechanically). three years later, it's still fine...
Still, a *commercial* truck w/ a 1 ton payload rating and u can't check the fluids? mmm, I guess we'll see. Still hopeful...
-pete
