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#21
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Ah, gotcha. That reference went right over my head since I haven't seen that movie.
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1966 Pontiac GTO (restoration thread) 1998 BMW 328is (track rat) 2023 Subaru Crosstrek Limited (daily) View my photos: Caught in the Wild |
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#22
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Not looking to change your mind on the 12 bolt but the more research I did pointed me to a Quick 9” for my ‘69 LeMans. Very happy with the results.
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#23
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Thank you for your input. I've been looking at the Quick Performance site. The thing I need to study next is brake size, I have drums and they list 11" drums which I am not sure will fit 15 inch wheels. I suspect so because I think 11" drums were on the station wagons which likely had 15 inch wheels. The other issue I might have is with having larger brakes on the rear as I still have 9 1/2" drums up front. I think that is the size Pontiac used. |
#24
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I hate seeing other people's cars.....that is awesome under there!
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#25
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I have a 9” with 11” drums and 15” wheels on the 64 and all fits well.
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
#26
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I re-used the factory 9.5" drum brakes from the 10 bolt BOP. There are housing ends that accept the big ford bearing and have the same bolt pattern as the drum brake backing plates. The center hole in the BOP backing plates needs to be enlarged a bit to clear the big ford bearings. Not a big deal.
There are a lot of options, just do the research and consider what you're really going to use the car for.
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I could explain all this to the girl at the parts store, but she'd probably call the asylum. White '67 LeMans 407/TH350/Ford 3.89... RIP Red '67 LeMans. 407/TH400/Ford 3.25 |
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#27
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Vid, what sway bar is that and is the jack pad still accessible?
X10 on QP Sent from my iPhone using Tapatalk[/QUOTE]
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Chris D 69 GTO Liberty Blue/dark blue T400, 9" w 3.50s, 3905lbs 461, 850 Holley, T2, KRE 310s, Comp HR288 w 165s, RA manifolds, 11.60@114, 1.58/60 The spare: 467, 850 Holley, T2, Edelbrock Dport 310cfm w RA manifolds, HFT 245/251D .561/.594L, 11.59@ 114, 1.57/ 60' |
#28
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I was bracket racing launching off of a transbrake with slicks and it was nice to have a strong 9” under the car, however it wasn’t really a high strength unit and only had a stock cast iron housing, a Detroit Locker and shortened/resplined stock 31-spline axles. This was an old 1987 vintage Currie 9” that came in the car when I bought the car in 1989, built off of a salvage yard housing like most back in those days. It wasn’t that uncommon for my competitors to break their stock 12-bolts on the starting line which made me like the 9” even more. For my street only ‘64 Tempest with the 430 hp LS3/4L70E I decided on the ‘71-‘72 Buick/Olds GM corporate 8.5” 10-bolt. My reasoning at the time was because those units are equipped with bolt in axles and tapered roller axle bearings to better handle cornering loads. Also the lower friction 8.5” gears as well as the lighter axle housing, for better suspension control since the axle housing is unsprung weight. I’m running fairly heavy 13.4” C6 Corvette rear disc brakes (and corresponding 14” front discs) so I thought compensating for that with a lighter rear axle assembly might be a good idea. Maybe I’d have been better off with a new aftermarket 12-bolt but what’s done is done. I did upgrade the 8.5 with an Eaton posi and 30-spline Moser axles so I’m sure it’ll handle whatever I’m doing during spirited street driving and occasional canyon carving.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#29
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Thanks grivera. You probably have discs up front but in case you have original drums how does it affect handling due to mismatch of brakes with the smaller front?
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#30
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Without a doubt, it is embarrassing actually. At least I don't drive like an idiot : ) tailgating speeding around town and such and very cognizant of what is going on out front and to the sides. But I totally agree. In fact I have the A arms, spindles, tubing, prop valve, master cylinder and booster out of the 1969 GP I took the 428 out of. But then this brings up what HO did way back when with the 1964 GTO, Kern's I think, where they used I think A arms from a 73-77 or so A body with which the improved geometry made a handling improvement. For all these parts including a 8.5 I could part out my 1974 LeMans! Ugh, that would make me sick. Did you happen to run your car for a short time with smaller front drums? |
#31
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I know that wasn’t your question but wanted to throw it out there
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Will Rivera '69 Firebird 400/461, 290+ E D-Ports, HR 230/236, 4l80E, 8.5 Rear, 3.55 gears ‘66 Lemans, 455, KRE D-Ports, TH350, 12 bolt 3.90 gears '69 LeMans Vert, 350, #47 heads: work in progress |
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#32
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The only special item needed for the tall spindle conversion was a matching lower ball joint that had the diameter turned down so it would press into your lower A-arm and the correct outer tie rod ends that matched the spindles. The original setup used offset upper shafts and a pretty big stack of alignment shims, later the aftermarket came up with tubular upper arms that corrected this. Do yourself a favor and get those GP spindles and discs installed. Being able to stop for the idiots you will encounter out on the road is very important.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#33
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Don't stop, I appreciate it. I didn't really know manual discs were an option to consider. Thanks for volunteering.
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#34
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Manual disc brakes. Funny thing is this car came with factory power drum brakes but I just prefer manual, but with front discs of course.
Just factory 11” discs and 9-1/2” drums. They’re fine unless you have a disability that requires you to have power brakes. Frees up some room in the engine compartment plus it saves weight and simplifies the braking system.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#35
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B-Man--I should have supplied bump steer spacers with the kit. Believe it or not , I just thought of that last year ! But I had very few complaints about bump steer problems.
Dale-O: Ken's GTO
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GOOD IDEAS ARE OFTEN FOUND ABANDONED IN THE DUST OF PROCRASTINATION |
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#36
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I ran the strong arm setups in 2 different cars for many miles and the improvements were so dramatic, never noticed the bump steer.
There are several manufacturers that make bump steer kits, fairly inexpensive, and just to say, the cars came from the factory with considerable bump steer. I was going to comment Ken on the name-toss, but been a little busy lately! .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#37
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Later on I repurposed the same kit pieces but added the Hochkis upper control arms and ran that setup on my ‘64 Tempest while swapping to ‘78 B-body spindles and 12” rotors, I thought it was great in every aspect. I’m not such a sophisticated driver that I ever really noticed any bump steer issues. Then I went crazy and put SPC control arms, AFX forged aluminum spindles and C8 Z06 14” discs in the front when I was bitten by the Pro-Touring bug, project creep.
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1964 Tempest Coupe LS3/4L70E/3.42 1964 Le Mans Convertible 421 HO/TH350/2.56 2002 WS6 Convertible LS1/4L60E/3.23 |
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#38
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Quote:
FWIW
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"No replacement for displacement!" GTOAA--https://www.gtoaa.org/ Last edited by 1968GTO421; 09-24-2023 at 05:14 PM. Reason: typos |
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#39
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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#40
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Not sure how accurate this is, but it is interesting.
https://www.tceperformanceproducts.com/bias-calculator/ .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
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