The answer is to use shims in this 'stack' of errors. Then, we press-in bushings that also have tolerances. Ford Thunderbird 1963, Rear Lower Control Arm Bushing by DormanĀ®. During the day, we go through many coils of steel and we hold consistency as close as possible. Lower and upper control arms are pressed in dies at over 500 per HOUR. We use 'go' and 'no-go' gauges that show acceptable tolerances. Different alloys produce different 'spring-back', so when a part is formed in a die the variation from one 'float of steel' to another can be profound. For outer skins, we constantly adjust press 'shut height' to compensate, all day long. I have seen a coil of steel change thickness right in the middle of the coil. Ford buys steel from different companies and from different countries. Heidts Tubular Front Control Arms Rear Radius Rods Removable Roof Panel Side. Understand that sheet metal thickness and alloy is all over the map. So, why shims? Why not just make the tolerances closer? Column Shift Tube - Automatic - 1965-77 Ford Truck Part : C9TZ-7212-E. Column Gear Shift Arm Thrus - 1965-79 Ford Truck, 1966-77 Ford Bronco Part : C5TZ-7D363-B. If you tighten while the front wheels hang, you're setting the 'center of rotation' wrong. Thunderbird (3) Econoline (6) Edsel (1) Ranchero (4). So, all rotation is done in the urethane but there is a 'range of motion' that must not be exceeded or the urethane will tear prematurely. If you look at the bushing, the inner sleeve has teeth that dig in when tightened. SHACKLE KIT LEAF SPRING REAR 1964-70 FORD FALCON 65-73 MUSTANG 71-72 COUGAR 64-65 RANCHERO 64 COMET BLACK RUBBER (FS769) CONTROL ARM BUSHING - UPPER 67-72 TB. Nothing turns on the bolt, so I refrain from calling it a 'pivot bolt' because it is not. That should allow enough room to crawl under the front and tighten the bolts to set the bushings. You can do it by resting the front wheels on ramps while the rear end is level on jack stands. At Ford, a guy in a pit would have tightened the bolts while the wheels are resting on a moving flat-top conveyor. I agree with 9310alloy, and I'm glad he mentioned the very important fact that these bushing bolts MUST be tightened only when the front end is sitting at 'normal stance'.
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