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1984 Knuckles??

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Old Mar 20, 2021 | 11:19 PM
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Default 1984 Knuckles??

Hey folks, I have an 84 Corvette racecar, its been a great steed so far.

I have noticed a few things when looking up parts for the car (bigger brake kits for example) that the 84 Corvette knuckles seem to be there own thing. I have read about people swapping to the knuckles from later cars and I have heard that GM changed the later knuckles to take the scrub out of the front end of the car?? Ive also heard that the 84 knuckles are somehow weaker then the newer style ones.

Can anyone shed some light on this for me? I love how my car runs, but if there is some speed to be gained by swapping the knuckles or maybe a risk of failure Id like to know.

As always thanks for reading.
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Old Mar 20, 2021 | 11:34 PM
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Originally Posted by Tiptoetherat
Hey folks, I have an 84 Corvette racecar, its been a great steed so far.

I have noticed a few things when looking up parts for the car (bigger brake kits for example) that the 84 Corvette knuckles seem to be there own thing. I have read about people swapping to the knuckles from later cars and I have heard that GM changed the later knuckles to take the scrub out of the front end of the car?? Ive also heard that the 84 knuckles are somehow weaker then the newer style ones.

Can anyone shed some light on this for me? I love how my car runs, but if there is some speed to be gained by swapping the knuckles or maybe a risk of failure Id like to know.

As always thanks for reading.
'84 has M12 hardware for securing caliper bracket, '85 thru '87 has M14 hardware - there are I believe brake kits/packages for the '85 - '87 fitment, which to install on an '84 would require I believe knuckles, bolts and brackets. I don't believe the '84 knuckles could be reamed/bored to accept the M14 hardware without sacrificing maybe some strength. You could inspect yours and make a decision. There's C5/C6 kits/brackets but they do require M14 hardware.

Last edited by WVZR-1; Mar 20, 2021 at 11:37 PM.
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Old Mar 21, 2021 | 07:39 AM
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1985-1987 use the same geometry and will bolt on. 1986-1987 has the ABS sensor.

This is my 1984 and I think that there is enough meat to bore them out.

I made my own adapter that also use the hub bolts. This is with the prototype adapter. I made the real one from thicker aluminum.




Last edited by JoBy; Mar 21, 2021 at 07:40 AM.
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Old Mar 21, 2021 | 10:16 AM
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In regards to scrub. For 88 Chevrolet changed to a zero scrub radius design. Zero scrub kept the tire flatter while cornering. Zero scrub increases tire life and has some benefits on road courses. The earlier 84-87 has a quicker and high camber curve design. The 84 suspension was designed to reach 1.0 g on a skid pad, a big deal in the 80's. Cars didn't have the horsepower of the past, so handling became the focus. The 84-87 are considered better autocross cars than the 88-96.
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Old Mar 21, 2021 | 02:39 PM
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If you consider swapping to 1988-1996 knuckles then you also need at least upper and lower control arms, spring, sway bar and steering rack.

Last edited by JoBy; Mar 21, 2021 at 02:39 PM.
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Old Mar 21, 2021 | 05:59 PM
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Alright, thanks for the good info folks. It sounds like this would be more trouble then its worth for us. We are limited on tire in my race class, its the typical 200 tread wear rule you see in a lot of series these days. My car wears the tires almost perfectly even across the tread, and we get more then one race out of them so...not hurting for tire wear. I HAVE seen big brake kits for the front of my 84 so if I DO decide it needs more brake I will go that route, I'll most likely swap some C5 stuff onto it and keep life simple. Again I'm getting more then one race out of a set of pads/rotors so I'm not in a hurry to spend that money at the moment.

Thanks for the info, you guys have always been great.
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