2006 5.9 Cummins with rear gear train

Anybody have experience with one of these? Working on a bunch of Freightliner MT45 delivery trucks and I've got 4 or 5 with what appears to be rear main leaks. But I know the rear gear train version might have wet flywheel housings. I pull the bottom plug out of the flywheel housing and get some oil out of it. Any body know how to figure out if I have a wet or dry flywheel housing? Freightliner cant tell me and neither can Cummins even with the ESN, and quickserve just shows the different options.

 

ESN is 46527184. Its a common rail 5.9. The parts breakdown on quickserve shows just the flywheel housing and seal. The weird thing is I can't see any sign of a gasket between the flywheel housing and transmission, or between the starter and flywheel housing. And the plug to access the flex plate bolts is just a rubber push in plug, not a threaded plug like you think a wet flywheel housing would have.

To further complex things, I need to get these things resealed and if it is a rear main seal leaking into a dry housing and weeping out the joining areas, there is apparently two different types of seal its possible to have, a lip seal that seals on the crank and a two piece seal that seals in itself. Different installers for both so I'm not sure which tool I will need once I have it apart. If I google the part number that quickserve shows me, it looks like the two piece. I guess I'll get that installer and cross my fingers.

 

If its dry do you have to remove the seal housing to replace the seal? Looking at quickserve online it looks like with the correct installer and remover it can be done as soon as the flywheel is pulled off the crank? Thanks for your help btw.