Seems like a lot of trouble to go through. And then in the future if anything goes wrong you'll have to remember which parts are GMC and which are Dodge.

For all the vehicles you go through I would just keep the GMC as a tow truck/working vehicle and find yourself a Pinzgauer

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1982 300GD Carmine Red (DB3535) Cabriolet Parting Out
1990 300SEL Smoke Silver (Parting out)
1991 350SDL Blackberry Metallic (481)

"The thing is Bob, its not that I'm lazy...its that I just don't care."