I haven't tried it yet, but it's reported that Permatex's "the Right Stuff" is working well. It's a newer generation of RTV, it applies out of a pressurized can.
It may be what your friend is referring to, because I did read that Chrysler uses it as factory differential cover sealer.
It may be what your friend is referring to, because I did read that Chrysler uses it as factory differential cover sealer.