There are different ways to add disc brakes to 64-72 GM A Body cars. The first way is to add 67-72 disc brakes from a donor car, these are just about bolt ins. The second way is to add disc brakes and spindles from a 70-81 F body or 73-77 A body, this is called the tall spindle conversion. The third way is to add disc brakes and spindles from a 78-87 G Body or S10 brakes and spindles, most people are unaware of this conversion. The height of the spindle between the ball joint on stock spindles is 7.125 inches, the height of the G body-S10 spindle is 7.5 inches and the height of the F body tall spindle is 8.75 inches. To convert 64-72 A body cars to tall spindle disc brakes you must use different upper and lower ball joints, the part number for TRW upper ball joints is TRW #10268 and for Moog upper ball joint is K5208. The lower ball joints must be turned down in a lathe .080 to fit the lower control arm, the part number for TRW is #10277 and for Moog is #K6145. You must also use an offset upper control arm shaft made by Moog to avoid excessive shim pack or buy after market upper control arms. You must also use tie rod ends from a 73-77 A body, the G body tie rods ends may also work but I am not shure. The tie rod ends screw right into the 64-72 adjustment sleeves. To use G Body-S10 spindles and brakes use the same upper and lower ball joints and tie rod ends as the F body tall spindle conversion. The best part of using the 78-87 G Body-S10 conversion is you don't need after market control arms or offset upper control arm shafts. Another good thing about using The Late Model G body-S10 conversion is the price, you can use almost all new parts inexpensively. You can also buy new after market 2 inch drop spindles for less than $150.00 and stock type G body-S10 spindles for less than $100.00, Disc Brakes rotors are less than $30.00 new and rebuilt loaded calipers are less than $20.00 each, front brake hoses are less than $10.00 each. The tall spindle conversion will make your car handle better. The G body-S10 conversion will allow you to use original style Rally 1 wheels and vintage mag wheels without rubing or locking up your calipers.
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