What trans is in a 1984 Chevy mobile traveler motor home built on p30 van?

The 1984 Chevy P30 motorhome likely used either a TH400 3-speed automatic transmission or a Allison automatic transmission, depending on the specific options chosen by the coach builder (Chevy Mobile Traveler was a coach builder, not a factory-produced RV). There's no single definitive answer without the specific vehicle's documentation (like a build sheet or service records). The Allison was a more heavy-duty option often preferred for motorhomes.