What configuration of '77 do you have i.e. length, type of front lounge, bathroom location, bed configuration and which side is the sink on? I have a dealer service manual which had more stuff than the regular service manual that came with my '77 Excella 500.
'01 2500hd ext. cab, 8.1 litre gas, 5 sp. Allison auto
3.73 rear end
Mag-Hytec rear diff cover
Amsoil Dual by-pass oil filtration system
Amsoil synthetics all around
265 watt AM Solar, Inc. system