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#1
11-23-2025, 09:24 PM
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What Diameter Rear Sway Bar - 1972 Formula
Working on a 1972 Formula. When I got the car, the rear sway bar had been removed. The front sway bar was present and is 1.125" in diameter. What should the matching diameter rear sway bar be? Thanks.
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#2
11-23-2025, 10:13 PM
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7/8" bar
__________________
John Wallace - johnta1 Pontiac Power RULES !!! www.wallaceracing.com Winner of Top Class at Pontiac Nationals, 2004 Cordova Winner of Quick 16 At Ames 2004 Pontiac Tripower Nats KRE's MR-1 - 1st 5 second Pontiac block ever! W.E.C moment "Every man has a right to his own opinion, but no man has a right to be wrong in his facts." "People demand freedom of speech to make up for the freedom of thought which they avoid." – Socrates |
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#3
11-24-2025, 01:39 AM
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If you have Y99, I think 7/8" is correct. But standard would be 5/8". I could be wrong.
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So long, farewell. |
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#4
11-24-2025, 03:10 PM
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Check PHS to see if you have Y99 (trans am) suspension option....
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#5
11-24-2025, 07:59 PM
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Performance and handling PKG or "T/A suspension" in 72 would have a 1.250 front sway bar and the larger 7/8 rear bar with 15" tires. Sounds like your car does not have that suspension because of the 1.125 front bar.
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#6
11-24-2025, 08:34 PM
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Going from my '73 Dealer album I'd say it stongly points to a 5/8th rear bar as being correct. As mentioned, if you had the bigger bar up front then you'd have gotten the larger bar in the back. You should get the PHS, but if I were a betting man I'd put money on the 5/8ths being correct for your car.
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#7
11-24-2025, 09:58 PM
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With the 1.125" front bar, I also believe it would have been spec'd with a 5/8" bar in the rear.
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keith k 70 Trans Am RA III / T400 / Lucerne Blue / Bright Blue 70 Trans Am RA III / M20 / Lucerne Blue / Sandalwood 70 Formula RA III / M21 / Lucerne Blue / Bright Blue |
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#8
11-24-2025, 10:20 PM
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Thanks for the information everyone.
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