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Sorry didn't understand the question then. I would do fuel filters first. Some of the fuel lines on one of my trucks have some cracking. It hasn't caused a problem yet and I don't use it much anyways. Once it warms up I was going to swap them. The rack is controlled by a linkage to the governor...

The first gen trucks are all mechanical. The cat dealer can make some adjustment and give you a bit more power. On the 5ton versions they have 290hp I believe the injectors are a bit larger as is the turbo.