The 4th Generation has a "cold" crosshatched area and a "hot" crosshatched area on the dipstick, plus a crook (bent section) in the dip stick. The "cold" mode is much easier to check. The dipstick has information on it as well, like "DO NOT OVERFILL". Well ......... who reads a dipstick or the Owner Manual, for that matter.Also, hot/cold lines on dipsticks are where it's at! My old Chevy 350/TH400 has both marks, which makes it a piece of cake to check the fluid. I guess 2 marks is also too complicated for modern engineers? Because it's impossible to figure out where the fluid settles when cold, or hot, whatever... So dumb.
The crook in the dipstick, what's that for?
Is the transmission fluid level supposed to be at the top of the crosshatched area?
As to no drain plugs, that's common. The differentials on my Jeep have no drain plugs, just fill plugs. After removing the cover plates, draining the fluids, and RTVing things back together, I now just pump the fluid out to change it, a lot less work. I usually add a bit of fresh fluid and pump that out as well, to help clean things up (peace of mind). The Jeep has a lot of miles on it and no major drive train work to date, just front axle outer U-joints.