MY friend was curious about what t-case my 98 1 ton 4x4 crewcab had. I've always thought it was a Np241 with a bunch of cooling fins. We got to looking at it real close and it doesnt look anything like a 241, the case just looked...different. While it is an aluminum case though, the strangest thing was it has a PTO cover on the passenger side of the planetaries. It is the manual shift version by the way.