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69 Firebird Disc vs Drum Spindles Posted By: cowles0628 On: 01-04-2008 @ 18:05:25 Reply | Edit Drum to disc conversion. 11" rotors fit fine on my original drum brake spindles. Any reason I have to go buy disc brake spindles? Anyone know if the original spindle part numbers are the same for drum and disc on the front of a 69 Firebird? Posted By: 77chicken On: 04-07-2007 @ 01:50:35 Reply | Top | Edit call ssbc or bear??? Posted By: cowles0628 On: 04-07-2007 @ 07:10:40 Reply | Top | Edit I called SSBC, they just want to sell me spindles and not talk about any differences. I'll call Baer too. Meanwhile, I found this about parts from the junkyard: "Once you get everything home, you'll find that a lot of stuff seems identical to the basic drum setup. And for the basics, it is. You will also note one item: The disc and drum spindle is identical. Almost. =) The top mounting pad of a disc spindle is machined down a half inch. Yup, we go through all that trouble to find that the basic guts of the two are the same part. So why bother finding a donor? Pay someone to machine the spindle if you can't do it yourself, and have your car stuck on jackstands for an extended period of time while you run off to the machine shop with all the parts so they can verify your caliper will be square to the rotor. " Posted By: cowles0628 On: 04-13-2007 @ 20:47:39 Reply | Top | Edit I bought new spindles from D&R Classic Automotive for only $89 each. There is one more difference. The top bolt into the disc brake spindle is much larger diameter than on the drum brake spindle.
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