Re: service manual for 88 BB fe
It would be easier to get an engine manual, they are sold on CD's on the net. You can get transmission info from Allison's web site.
Air Brake info from the Bendix web site. And so on with the other pieces of the bus. The one thing that would be nice from BB is a wiring diagram, otherwise, as they used to say, you ring out the wiring (which you aren't going to really do, just trace them out, and use your VOM).