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Old 03-04-2007, 01:08 PM
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GTO Brakes

Does anybody know if 1982 Firebird front disk brakes will fit on the front of a 1969 GTO? Thanks AL

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Old 03-04-2007, 01:09 PM
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Pretty sure.....90% sure..........NO.
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Old 03-04-2007, 01:12 PM
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OK sure not sure why or why not
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Old 03-04-2007, 01:21 PM
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Because the spindles are different............
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Old 03-04-2007, 01:25 PM
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How different??? I know they will be different because I put 70 spindles on a 66 malibu and it dropped the front end by an inch, I put a set of inch over springs in her and it lifted her right up. I also had to change the lower ball joint and outer tie-rod. I am just trying to save my son a grand, are the spindles sae or metric? Thank you Al
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Old 03-04-2007, 01:35 PM
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I dont know exactly why they don't fit, but if it was an easy swap, I figure` everyone would be doing it. ..........I am just guessing here........Maybe, someone else here has a better idea.
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Old 03-05-2007, 08:30 AM
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Quote:
Originally Posted by chevmal
Does anybody know if 1982 Firebird front disk brakes will fit on the front of a 1969 GTO? Thanks AL
Again, no. Most importantly, the 82-up F-body uses a strut-type front suspension. The A-body uses upper and lower control arms.

The 64-72 A-body, 67-69 F-body, and 68-84 X-body GMs all used the same spindle design and the same ball joints. Nothing else is a direct interchange. Even if you find a spindle that you can physically bolt up to the ball joints, the biggest problem is that GM changed ball joint designs and starting in the mid-70s the taper on the ball studs is different. Since the ball stud is designed for a uniform loading along the entire taper of the stud, the taper mismatch will cause excessive loads on the stud and can lead to breakage. Also, the later cars have different locations for the steering arms, which results in bump steer and handling problems.

One popular swap on the A-body cars is to use the 70-81 F-body or 77-90 B-body spindles. The B-body spindles can even be had with 12" disc brakes. The problems are 1) you still need different ball joints due to the taper difference, 2) the taller spindles require custom upper control arms to enable the alignment to be set properly and 3) you still have some bump steer problems.

The only thing a third gen (82-up) F-body front suspension has in common with the 64-72 A-body cars is the 4.75" wheel bolt circle.

Last edited by joe_padavano; 03-05-2007 at 08:45 AM.
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