Go to They have manuals for all American and most foreign vehicles - operation, maintenance, parts, service bulletins, etc. I got a P30 manual from them in the early 90's, and many manuals for other vehicles since then.
The GMC Motorhome was manufactured by the GM Truck & Coach Division for model years. Initially offered a four-speed manual transmission with front-wheel drive, available from 1963 to 1970 until the division was sold to Kent Industries. I have not been able to locate factory repair manuals for my Southwind motorhome or its P30 chassis. I'm sure there are manuals, but none.
Be aware that some of the older manuals may be on CD only rather than print. This manual covers the chassis/engine/powertrain only. The manuals for operating the coach's systems is supplied by the RV manufacturer. If you have an older rig and the manufacturer cannot supply manual and/or wiring diagrams, many times those items can be found in eBay, Craigslist, etc.
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