Belltech 4975 Pinion Shim Set
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They are available from a variety of perspectives. I bought shims with 1 and 2 degrees of inclination. There are differences in the part numbers. They were clearly marked on the box when I bought them. I understand that this is insufficient information to assist you in making a purchasing decision. Check out Belltech's website to see if they have a genuine part number. It's been a few years since I purchased mine, but: A 2 degree shim was 4975, while a 1 degree shim was 4973. Make sure you know how much shim you'll need before you buy.
The Belltech 4975 is a two-degree device, while the Belltech 4973 is a one-degree device. I believe they make a 3 degree, but I've never needed one and thus have no idea what the part number is. If you're not sure, call Belltech.
They're good for a 2 inch change in ride height; anything more than that and you'll need a greater degree shim.
If your C10 has leaf springs with the axle on the bottom, and you get the right shim kit for your truck, it should work. It's important to remember that if the shackle pivots up at the back end of the spring, the shim's wider end goes to the front, bringing the axle back to the proper angle. The spring rotated around the pivot of the front spring hanger when it was moved up, pointing the pinion down. The pinion is raised to its original angle using shims.
Selected User Reviews For Belltech 4975 Pinion Shim Set
On my 1972 AMC Javelin, I used these to adjust the pinion angle. The pins that came with the kit were too large to fit the holes in my springs, but I was able to reuse the old ones. With thicker shims, that wouldn't have been possible, but 2 degree shims are relatively narrow. I had to make some spacers out of an old suspension bushing to allow the pin to protrude sufficiently through the spring after the shim was installed. The package included some threaded hex spacers, but I have no idea what they're for because there are no instructions, and I don't see how they'd be useful in my application.
After installing the shackle kit, the degree of cure was increased by low-speed vibration. In my 2018 RCSB GMC Sierra, I installed a lowering shackle kit. I experienced a vibration of 20 to 30 mph after installing the kit. Installed the 2-piece set The problem was solved using degree shims (fat end to the back).
There are only two of these in the package, and they don't fit.
The Belltech shims worked fine, but I had to use a die grinder and saw to make the notch in the shims deeper because Fords have double center bolts on the spring. In addition, the through bold provided in the kit is the wrong size, being too small. This is my third purchase of these shoes. Belltech should fix the shims so that they fit correctly without having to alter them because Ford has been making their rear springs like this for several years. Belltech deserves credit for producing shims in a variety of degrees, as these aren't a one-size-fits-all situation.
It functions flawlessly.
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