Pontiac - Race The next Level

          
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Old 03-16-2026, 02:05 PM
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dv657172 dv657172 is offline
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Default Rear Sway Bar issue

65 GTO dedicated racecar

Car has had a swaybar that runs directly under the rear housing since I bought it which requires jacking the car up by the side frame rails in the rear rather then under the rear end which is a pain. (see pic - taken at end of race season, all cleaner now fyi)

Whats a good solution to this issue? Anti-roll bar? Car doesnt make a ton of horsepower yet but hopefully increasing it in time

Thanks
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1965 GTO Cameo White, Red Interior - 389, ST300 numbers matching
1965 GTO Black, Black Interior "Post" car - 389, M-20 numbers matching
1965 GTO Silver, Black Interior 100% dedicated drag car w/1968 400(461), 16x Heads, TH400, 3.90 9" Rear 1.656 60' 7.566 90.057 (1/8th)
1971 GTO Black (orig. Quezal Gold), Gold Interior - 400, TH400 numbers matching
1972 GTO Cardinal Red, Black Interior - 455, TH400 almost numbers matching
  #2  
Old 03-16-2026, 05:45 PM
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Skip Fix Skip Fix is offline
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How about this?
https://www.proeagle.com/products/floor-jack-extensions

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
  #3  
Old 03-16-2026, 06:21 PM
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The issue isnt the height its that the swaybar runs directly under the rear diff and to try and jack up the car via the diff you would bend or at least stress the sway bar as there is a gap between the bar and the diff.

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1965 GTO Cameo White, Red Interior - 389, ST300 numbers matching
1965 GTO Black, Black Interior "Post" car - 389, M-20 numbers matching
1965 GTO Silver, Black Interior 100% dedicated drag car w/1968 400(461), 16x Heads, TH400, 3.90 9" Rear 1.656 60' 7.566 90.057 (1/8th)
1971 GTO Black (orig. Quezal Gold), Gold Interior - 400, TH400 numbers matching
1972 GTO Cardinal Red, Black Interior - 455, TH400 almost numbers matching
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Old 03-16-2026, 08:22 PM
TXSTARFIRE TXSTARFIRE is offline
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Put a wood block between the bar and the differential or just remove the bar. I dont think the bar does much for a drag car.

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Old 03-16-2026, 10:20 PM
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Mike Davis Mike Davis is offline
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I have a BMR anti roll bar on my 65 and 66. I use a block of wood between the bar and housing most of the time. The BMR has 2 clamps on the axle tubes and 2 links that go to the frame. When I am at the track I usually just out the jack under the bar. I haven't noticed any deflection or bending.
Does your bar bolt to the Lower Control Arms? Does the car leave level?

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66 GTO (Retired race car)
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66 GTO 389 3x2, 4 speed, 3.90 gear, Montero Red 33K original Miles
67 GTO 2dr Post, 428, Tri Power, 3.55 Gears
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  #6  
Old 03-17-2026, 12:42 AM
ANDYA ANDYA is offline
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I have the same issue with my 65 GTO. I have a dedicated block of wood for this purpose. In my case a 2x4 is too thick. I believe it’s a piece of 5/4 with some blue tape on it so I can find it easy.

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Old 03-17-2026, 06:57 AM
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Thanks for the wood idea guys. Will definitely work on that.

Mike - Welcome back to the board. The car does leave level and the bar is bolted to the control arms which are boxed.

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1965 GTO Cameo White, Red Interior - 389, ST300 numbers matching
1965 GTO Black, Black Interior "Post" car - 389, M-20 numbers matching
1965 GTO Silver, Black Interior 100% dedicated drag car w/1968 400(461), 16x Heads, TH400, 3.90 9" Rear 1.656 60' 7.566 90.057 (1/8th)
1971 GTO Black (orig. Quezal Gold), Gold Interior - 400, TH400 numbers matching
1972 GTO Cardinal Red, Black Interior - 455, TH400 almost numbers matching
  #8  
Old 03-17-2026, 08:26 AM
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Mike Davis Mike Davis is offline
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Thanks for the welcome back.

When my 66 had a bar bolted to the lowers I could not get it to leave straight or level is why I was asking.

Sounds like a block of wood will fix the issue.

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65 GTO, Tiger Gold, Nostalgia Super Stock 421, 2-Carter AFB carbs, Stock Suspension, 3550lbs Full Exhaust-- 9.70's@135

66 GTO (Retired race car)
421 CID
Multiple NSCA/NMCA World Champion

66 GTO 389 3x2, 4 speed, 3.90 gear, Montero Red 33K original Miles
67 GTO 2dr Post, 428, Tri Power, 3.55 Gears
80 Trans Am Black SE Y84 W72 WS6
  #9  
Old 03-17-2026, 01:33 PM
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I was thinking the narrow tube spacer could get the rear around the bar.

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1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
  #10  
Old 03-17-2026, 04:33 PM
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Skip Fix - thanks for the alternative. It might work but will give the block of wood a try first

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1965 GTO Cameo White, Red Interior - 389, ST300 numbers matching
1965 GTO Black, Black Interior "Post" car - 389, M-20 numbers matching
1965 GTO Silver, Black Interior 100% dedicated drag car w/1968 400(461), 16x Heads, TH400, 3.90 9" Rear 1.656 60' 7.566 90.057 (1/8th)
1971 GTO Black (orig. Quezal Gold), Gold Interior - 400, TH400 numbers matching
1972 GTO Cardinal Red, Black Interior - 455, TH400 almost numbers matching
  #11  
Old 03-17-2026, 05:14 PM
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I think the block would be better and cheaper!

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Skip Fix
1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever!
1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand
1965 GTO 4 barrel 3 speed project
2004 GTO Pulse Red stock motor computer tune [email protected]
1964 Impala SS 409/470ci 600 HP stroker project
1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs
1964 Corvette Coupe 327 4 speed
  #12  
Old 03-18-2026, 11:12 AM
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I always wondered why there wasn't a horseshoe like item that would slip through the swaybar, then spin it and you could push on this and it would only touch the rear diff and jack.

I guess you could do this with the wood block, slot it, slip through, spin it then you push on the bottom of the block and top of block pushes on rear diff and not the swaybar.

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  #13  
Old 03-18-2026, 04:34 PM
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Scarebird Scarebird is offline
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We all do it but I wonder at the wisdom of jacking by the diff?

I gave thought to putting a drain plug in the floor of the casting but not worth the potential for issues.

On a side note was gassing up here in NM and a Tundra pulled in and made a hell of a bang - like it hit a bollard. She pulled forward and even louder bang. Broken diff? She just came from the mechanic for brake work - maybe FOD in the diff?

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