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Re: 5th Wheel hitch
One tip I can give after doing mine is:
Put a piece of masking tape over each hole on your mount plates. With a pen, draw a vertical line and a horizontal line (aiming cross)on the tape that covers the pin hole so that where the two lines cross is the exact center of the mount plate pin hole receptacle.
So now you should have your 2 plates with two pin receptacles in each covered with a large piece of masking tape with an X marking the exact center of each receptacle hole. Make sense so far?
Now mount the plates with 2 bolts each so that they are tight and in place but easily taken back off. One thing, mark the frame fore and aft, up and down as the paltes can move more than an 1/8" as you loosen and tighten the hardware.
Do all your bed measurements 2 or 3 times. Now use a center punch and make a punch mark where your small drill bit will make the starter hole. Drill down through the bed ensuring you are square to the bed in both directions. (make sure drill is long enough that it will go through the bed material and down and puncture the tape covering your receptacle wholes on the mounting plates. Drill all 4 starter holes.
Remove plates, examine where the pilot hole drill punctured the tape in realtion to the crosshairs you drew on the tape. If it is off by an 1/8th to one side and down an 1/8th as an example, just make the same adjustments up on the corresponding truck bed pilot hole, re-centerpunch over 1/8th and down an 1/8th and re-drill your pilot hole. make all 4 adjustments to your hole markings, circle the hole in the tape on each, remount the plates,put a sharpie marker X over original pilot hole to denote its not to be used. Re-drill your holes, then re-examine your tape crosshairs. Again make sure the plates are on in the same exact place prior to re-drilling the bed.
Once satisfied that your pilot whole is the exact center of the underlying mount plate receptacle hole, drill your 4 larger holes with a hole say using the applicable pilot holes.
You can do this several times, I had to do only once, this will ensure perfectly centered holes though and well worth the effort. Your pilot holes of course will disappear with the larger hole saw takes them out so do not worry.
Hopefully this is understandable, it is sometimes hard without pictures to describe.
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2007 GMC 3500 4x4 Dually Duramax/Allison
Sold F350 6.0L TS SRW SWB 4x4 King Ranch FX4 Loaded 409SS MBRP Cool-Duals Isspro Pyro
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