I think my setup is original to the coach but my exhaust off the turbo angles down toward to front of the engine compartment, right over the gearbox. Seems like a bad idea to put all that heat so close to the gearbox. Replaced the muffler while I had space to do it from the top too and believe it was original to the coach as well. Mine still has the heavy steel fan and after learning just how much it weighs, that fan upgrade sounds like a great idea. Looking at the parts manual it looks to be a fairly simple hub change on the gearbox to do the changeout.

Good point on the dipstick. I can often be counted on to overlook the obvious.

Steve Rowe
90 Royale XL