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I figured you and Randy would know what it was. So when/why were they used? My truck had one on the right side only. Did the factory install them to compensate for the engine shifted to the right side and the battery on the right side, or, were they dealer installed if a customer complained that the truck didn't sit level side to side. In my case it doesn't matter since I'm converting to 4WD but was just curious.
They are a shim that went at the lower end of the spring on top of the radius arm. Since they are listed as being "As Required" they are something that would be used only when needed for a corrective action. I assume it is used to level things up like you say. They were only used on 1965/66 F100/250 4x2.
My truck has the lower spring seat installed, of course, but no shims as far as I can tell. The shims would be installed underneath these spring seats.
C5TZ-5A307-A - Front Spring Seat Assembly - Lower - 2 each
So, how accurate are you going to try to replicate a 1966 F100 4x4 SWB? I've got a few parts for those series that are getting a bit rare. Here's one example. 1966 and newer F100 4x4.
C6TZ-7B051-A - Transfer Case Control Rod Assembly - 1 each
The idea is to have it look like factory '66 SWB 4x4 but underneath some mechanical updates to make it a little more driveable. Already have the frame modified with a '78 4x4 crossmember to install the disc brake front axle and power steering from the 78. Engine is going to be an EFI 302, AOD trans, not sure on the transfer case but I have the 205 from the 78 that will fit onto the AOD. Most likely a Vintage Air or similar AC system. Other than that, pretty much stock, two tone blue and white. I would think there will be very few people that can tell it's not an original truck except for the engine when you lift the hood.
The instructions for the shim are thanks to Keith at another site, I just thought I'd share it here to go with the picture of the shim.
My truck is mostly in pieces but I can't picture that bracket. The two mounting surfaces appear to be 45 deg apart, two square holes which usually mean carriage bolts. Maybe steering column?
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