Q: Turbo constantly revs on 2006 Ford F-350 Super Duty

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Recently had new head gaskets (and a lot of other parts)replaced on my f350 with 6.0L engine, it runs fine until I hook up trailer with equipment loaded (about 5000 lbs) the turbo starts revving when throttle is pressed the more I press the gas pedal the higher it revs, if I try to get up to speed the truck will start to overheat. Any help is appreciated
(1) Answer
The turbo is exhaust driven so the more diesel is pumped through it the more it spins, I would have the shop that replaced the head gaskets check their work because this ford diesel should easily pull that load without overheating