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I lifted the cab recently on this F100 project to clean up the frame and do some trans/ engine service... all of that went great, and now I have the cab back on the mounts.
I'm having a tough time figuring the best way to center the cab back to the frame so it'll track straight and I'll have less issues ling up the body panels. What are you cab off guys using as reference points to get the cab dialed back on the frame? Not sure what points to trust on the frame or the cab to get it right.
Some pics for reference... Frame cleanup Frame/ trans serviced and cleaned...
Like I said, cab is set back on mounts (sorry no pic at the moment...). Measure from rockers to frame side to side? Rivet's on back frame rails to cab for front to back? Ugh, what works?
Measure on each frame rail, from the back, equally to a point that falls a several inches behind where the cab will finally rest to establish a place where a straight edge can span the two frame rails to form a parallel line to the back of cab. C-clamp it in place. Check for equal distance distance to the back of cab. You may have to lay another straight edge across the back of the cab also to accommodate the profiles in the sheet metal. The important thing is the two straight edges are parallel. This will establish the cab sits square on the frame. I really don't think this is necessary but for peace of mind that's how I would do it since the bed is off.
Ain't a whole lot of room in them bushings and holes for moving it around. Once you get the bolts in, tightened, take a drive, then she's gonna settle as she sees fit to.
Don't tighten the cab mounts until the front clip is on. Set your front clip alignment to cab first. Then set the assembly to the bed. This is the same technique that was used on the assembly line.
It's already on and sungged up for now... if I have to wiggle it around when I get to the front clip, I can do that later. Right now the front D44 is getting an overhaul.
I'd just measure from the rocker lip to the frame at the front and rear cab mounts and get it as even as possible left and right. Then maybe push it all the way forward, then all the way back and split the difference. Assuming your frame is straight and square, that should get the cab centered on there.
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