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  1. NDT

    GMC 6.5 Turbo/4L80E?

    The van has one computer that controls the 4L80E and the DS-4 electronic injection pump. Removing that computer and attempting to make it work in a HMMWV would be an absolute nightmare. The DS-4 sucked when it was new.
  2. NDT

    GMC 6.5 Turbo/4L80E?

    GM Vans do indeed have the rear mount turbocharger. The 4L80E will need to be completely disassembled to have the tail shaft replaced with the shorter 4 wheel drive version. It's even possible the engine is a Navistar cast block, GM quit making 6.5s in 2000.
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