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Message: [QUOTE="Racer X, post: 339065, member: 1934"] Tom, what's your opinion on taking a vacuum gauge reading from both pumps to find out? The E-series used the same basic belt driven pump as these trucks through the 2000 model year. The 99 Super Duty F series trucks have the same part number for the pump as OBS trucks. There are 2 different diaphragms used. One has a molded rubber tube the other doesn't. Based on the responses, I think their could have been different vendors supplying the pumps with slight housing or pulley variations. Or the 10 minute replacements are on trucks without air conditioning. Perhaps a combination of both. Off topic: In 1987 Lincoln began using an electric pump with accumulator for the 4 wheel anti lock power disc brakes on the Mark VII. The Mark VII LSC models had the 5.0 liter HO roller cam V8 used in the Mustang GT. Engine vacuum was available for a vacuum brake booster and one was used on prior Mark VII models and in the Mustang GT's. The Mark VII used the electric pump for brake boost for at least 7 model years. It worked trouble free for 250,000 miles for me. Not sure if Mark VIII's continued it or not. A rebuilt pump was $1600 @ Carquest when I last priced one in 2008. :doh: Due to the rebuilt pumps cost, enthusiasts of these cars either get used pumps or convert them to vacuum boosted brakes. The LSC Mark VII was the short name for the Luxury Sports Coupe model. It lived up to it's name. With 4 wheel anti lock power disc brakes, they also had electric air pumps for computer controlled air suspensions that adjusted on the fly for precise handling, 140 mph speed rated 16" wheels & tires and they would beat Mustang GT's in road course racing. The Mustang GT's had the weight advantage on the drag strip as the Mark VII was a larger and heavier car, slightly larger than the Thunderbird. They would beat the Thunderbird Super Coupes on road courses and drag strips despite the T Birds weight advantage. [/QUOTE]