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Re: Threaded Upper Control Arm HELP!
If the crossmember you removed had rubber bushing control arms and the u bolt holes were 9/16", then you did not have an original '68 crossmember. The screw style metal bushings and 1/2" u bolt holes were used to '72. In '73 GM went to rubber bushing and the larger u bolts.
Did you have disc brakes on the front too? It was common to swap a '73+ crossmember with the disc brakes into pre '70 trucks, long before there were disc brake spindles for the '70 and earlier trucks.
It would be good to see what you had removed, to help verify.
As for fixing what you have, you need to screw the bushings in until they are flush with the arm, no outside threads showing. Make sure you screw each side in evenly, so you don't offset your arms. Oh, you are also missing the rubber seals that go on the cross shaft and over the lip of the inner part of the bushing, to keep the grease in.
The u bolt holes, you will need to drill out. This is common now a days because no one makes the 1/2" u bolts because there was a breakage problem with them. This is why GM upgraded to the larger size.
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