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#1
02-17-2011, 09:47 PM
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Manual rack and pinion conversion kit 1968-1972 GTO
Has anyone done this? What kit did you use? Were there any problems,and what kind of weight savings was there?
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#2
02-17-2011, 10:02 PM
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My rack kit from TRZ just showed up yesterday... it is for a 75 bird but that really should not matter... Nice kit has everything I should need to put it on... have not weighted it yet but it is real light, I would be suprised if the rack itself weighs more than 10lbs... plus you will have to add the brackets and suck I would guess it will be around 15lbs total... the factory stuff was a tish over 38lbs....
Chad
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3500lb 10.5" tire. 5.34@134.4 with a poor 60' |
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#3
02-17-2011, 10:27 PM
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BrandX from this forum is detailing his 68-72 A body rack & pinion conversion over @ PZ.
IIRC it's in his "winter updates" thread that's in the general discussion forum. He's got lots of pics and a good description of what he's doing. Oh yeah,BTW over there he's BigChief455.  He'll probably find this thread sooner or later and be able to answer any questions you have. HTH Bret P. |
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#4
02-17-2011, 11:59 PM
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Quote:
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#5
02-18-2011, 11:44 AM
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The pictures show that you have to drill a hole through the engine crossmember for the steering shaft... other than that nothing in the pictures
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3500lb 10.5" tire. 5.34@134.4 with a poor 60' |
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#6
02-18-2011, 02:39 PM
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Is anybody aware of a kit that you don't have to drill through the crossmember? Don't want to reduce structural rigidity at all as my car has to turn at the end of a straight, but I'd love rack and pinion.
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#7
02-20-2011, 09:51 PM
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I am not sure if spending 850.00 dollars is worth 15lbs. after all we are bracket racing!
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#8
02-20-2011, 10:11 PM
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Quote:
4.53 @ 164mph |
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#9
02-21-2011, 09:57 PM
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That does look like a nice piece but yet again is it worth 15lbs. for bracket racing?
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#10
02-22-2011, 01:33 AM
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Yeah,looks nice,but pricey no doubt.
I'd be much more interested to see how the bump steer numbers look with that kit,that would always be my primary concern with that sorta modification. Nothing good about a modification if it makes the car a handful to handle @ the track. FWIW Bret P. |
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#11
02-22-2011, 10:20 AM
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Where's the steering pickup on the a-body spindle? Is it in line with the lower ball joint or higher up? Looking at that setup, the tie rods appear to hinge pretty far outside the lower control arm mounting point so I think you're looking at bump steer unless the mounting point on the spindle is about half way up, in which case there's nothing you can do about bump steer as as soon as the suspension deflects enough to get some camber, the wheel will steer. I know in an f-body, the steering pickup on the spindle is about in line with the lower ball joint so the tie rod ends have to hinge at the exact same place as the lower control arms to prevent bump steer (and this is how the factory setup operates). To have the factory amount of bump steer, the rack has to have the joints for the tie rods at the exact same place that the factory center link has the mounts for the inner tie rod ends. I don't know why someone would design a system differently unless they also sold it with spindles to match.
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