Ok, so I'm trying to put a plan together for 12 inch brakes, and I'm trying to avoid drilling the rotors or using hub adaptor plates. The car is an 85 SE with and 88 cradle.
If I go with the Corvair hub upgrade in the front I'll have a 5 X 4.75 bolt pattern so I'll be able to use the corvette rotor without modification. From other posts I've read that 98+ calipers are aluminum and mounting brackets can be fairly easily made. This sounds pretty strait forward, am I missing anything?
Can anyone suggest what to do with the rear hubs? I've read that a late '90's cavalier hub is close to the '88 fiero rear hub, needing some light machinging of the knuckle to fit right, but the offset is 1/2 - 3/4 greater. Is there anything else that will give me the 5 x 4.75 bolt pattern with a similar to stock offset and (hopefully) no machining of the knuckle? As far as the caliper, would it be better to keep the original '88 rear caliper and e-brake, or use something like the LT1 rear calipers? the car currently has no e-brake cable assembly, so addapting the stock hardware is not an issue.
Any suggestions for something better than what I'm thinking are welcome, once the plan is finished I'll do a full build up thread with pictures to show how it all worked out.
Mar 23rd, 2008
Posts: 6632 From: Los Angeles Registered: Oct 2001
Maybe I should add that I want to upgrade to the 5 x 4.75 pattern. I understand the larger bearing for the front is much stronger, and I'd like the larger availability of wheels at that pattern. I was not aware that I could get that 5 X 100 pattern drilled without the original 5 X 4.75 though, that certainly eliminates any concerns about weakening the rotor.
So has anyone upgraded the rear hub of an '88 to a 5 X 4.75 patern, without adding a plate and re-drilling?
Fiero redux Member
Posts: 135 From: Asheboro, NC Registered: Dec 2007
I dunno if this would work, but I read someplace that the unit bearing from the front of a S-10 4x4 will bolt into a fiero knuckle, but you'll have to use the outer end of the S-10 4x4 cv joint. I hope you find a solution that works for you. Edited for clarity.
[This message has been edited by Fiero redux (edited 03-23-2008).]
From what I've seen this is an '84-'87 only option, I believe you replace the knuckle with one from a Pontiac 6000 and bolt the s-10 bearing into it. Has anyone tried boring the 88 rear knuckle out a bit to fit a different hub with the correct spline count and 5 X 4.75 lug spacing? It seems to have enough material for some light machining, maybe even some facing if necesary to correct the offset.
Posts: 21674 From: Houston, TX , USA Registered: Dec 2001