Re: few questions related to the injector pump/ vacuum pump
the hard shifting may be caused by a faulty transmission modulator. I had the same problem and asked the diesel gods for help, and after replacing the modulator. my 86 shifts so smooth i almost think something is wrong. you should be able to pick one up at your local auto parts store. If you are having problems with your vaccum pump, you would notice that the brake would be more spongee and weak feeling, start with the modualtor and go from there
1986 Ford F-250 XLT styleside, 6.9 stock engine, 154,000 miles,3.05 gears and a trusty c-6 transmission, interior is trashed,paint is fading quick and the electrical system is got widgets.