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Cab roof question 1991 GMC - Drilling

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by RJB44, Feb 17, 2007.

  1. RJB44

    RJB44 1/2 ton status

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    I am interested in installing a combination map light and clock unit in the cab of my 1991 GMC Jimmy. I want to put it front center on the inside header area. I have the one piece molded unit with wiring. I want to assume that the sheet metal for the cab roof is two ply, meaning if I drill screw holes from the inside, I won't end up going through a single layer to the outside the of the roof. there are two screws that support this unit. I have puilled back my header material but just want to make sure I am safe to drill in that area. Thanks

    RJB44
     
  2. imiceman44

    imiceman44 1 ton status

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    My 76 cab had 2 layers so i am pretty sure the 91 will too.
    :D
     
  3. BKinzey

    BKinzey 1/2 ton status

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    Yep. 2.5 to 3" front & back and about 3/4" in the middle.

    Over the windshield there is some bracing as well.
     
  4. roadnotca

    roadnotca 3/4 ton status

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    I'm not sure but the LMC catalog may have the parts breakdown.:D
     

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