Scott, not to nit pick, but these kids need to learn to use the proper terminology. Our jeeps do not have transaxles, but they do have transfer cases. Huge difference, and if they go into the automotive repair field using the wrong terminology it could cost them a job during the itnerview process (don't ask me how I know!). In the most fundamental of explanations, the transaxle is a combined transmission and axle assembly (trans/axle) normally seen on front wheel drive cars. The transfer case is an additional transmission that selectively "transfers" a percentage (depending on its design, some can vary/slip) of the engine power to the front axle on a four wheel drive vehicle.
I agree with you about the G503 videos, especially as a teaching aid.