In another thread https://www.fiero.nl/forum/Forum1/HTML/063136.html (How hard to change wheel bolt pattern-new brakes), Bubbajoexxx mentioned that Pontiac 6000 (no specific year) heavy duty rear bearing hubs can be used (on the rear of the Fiero). I am switching from 5x100 to 5x115 and would rather not use spacers/adapters.

I went to a local Auto Zone last night to check on this. The rears have a 4 bolt mounting pattern (the Fiero has 3). I found out that the fronts (from the 6000) has the 3 bolt pattern. I purchased one and when I got home, I discovered that the area that needs to go internal to the rear spindle (not sure what to call it) is much bigger than the Fiero's. The Timken part measures 3.544in (90.02mm). The fiero part measures 2.792in (70.92mm).

If anyone can give me any infomation on which hubs I can get, I would appreciate it. Also, if anyone knows what hubs can be used for the front (without having to buy a hub/rotor combo and machining off the rotor) that would be great too.

Thanks to all that reply.

Anyone?

quote Originally posted by cire36: In another thread https://www.fiero.nl/forum/Forum1/HTML/063136.html (How hard to change wheel bolt pattern-new brakes), Bubbajoexxx mentioned that Pontiac 6000 (no specific year) heavy duty rear bearing hubs can be used (on the rear of the Fiero). I am switching from 5x100 to 5x115 and would rather not use spacers/adapters. I went to a local Auto Zone last night to check on this. The rears have a 4 bolt mounting pattern (the Fiero has 3). I found out that the fronts (from the 6000) has the 3 bolt pattern. I purchased one and when I got home, I discovered that the area that needs to go internal to the rear spindle (not sure what to call it) is much bigger than the Fiero's. The Timken part measures 3.544in (90.02mm). The fiero part measures 2.792in (70.92mm). If anyone can give me any infomation on which hubs I can get, I would appreciate it. Also, if anyone knows what hubs can be used for the front (without having to buy a hub/rotor combo and machining off the rotor) that would be great too. Thanks to all that reply.

I think the deal with the Pontiac 6000 conversion is that you need to use the 6000's knuckles as well as the bearings.

As far as front hubs without machining you are out of luck. The other car that used the same front spindles was the Chevette. I had a Chevette and I can tell you that the hubs are Unicast (hub and rotor are 1 pc) as they are in the Fiero.
There is a slim chance that since the Chevette was a "world car" you might be able to find some south american or european Vauxhall or Opel etc. variant that used separate hubs and rotors. Even if you could locate such a thing, it might be tough to get imported into the US, but good luck!

If you get an 88 you can redrill the front hubs up to at least a 5" x 4.75". (5" x 120.7mm) Corvette pattern.

quote Originally posted by jscott1: If you get an 88 you can redrill the front hubs up to at least a 5" x 4.75". (5" x 120.7mm) Corvette pattern.

Correct. Been there, done that. I still have the drilling jig (5 in x 120 mm). But then there are those pesky 88 rear hubs to deal with.

[This message has been edited by Marvin McInnis (edited 02-20-2007).]

Lots of FWD Buicks that have the 5x115mm bolt pattern fit our rears. However the fronts are a problem unless you use hub adaptors.

Once I start metalcasting, a knucle for the pre-88s are one thing I want to build so that I can use bearings like the 88s.

So are you all saying that I can use 88 fronts on my 85 and have them redrilled? If that is the case, I will do that.

I'm not sure about the Buick hubs, but the 88 hub's only fit 88

Is anyone here currently using aluminum adapters? If yes, have you had any issues?

quote Originally posted by cire36: So are you all saying that I can use 88 fronts on my 85 and have them redrilled? If that is the case, I will do that.

No, you would have to start with an 88 to use the 88 fronts. Or it's a lot of work to fit the whole 88 cross member onto an 85. Way too much work in my opinion just to change the bolt pattern.

quote Originally posted by cire36: Is anyone here currently using aluminum adapters? If yes, have you had any issues?

One word...DONT.

Ive fixed fenders on lots of cars that broke, and at least one friend total his vette. I myself had some real issues when I tried the cheap way out. (had to torch off 2 perfect wheel rims to do a brake job)

I have been helping a friend of mine race a Cavalier "circle track". The tech across from me was telling me of a tech that ran at this track in the mid 80s with FWD cars. He said at this track and that the Hub and Bearing failed. The Tech that was racing had used Caddy front BRGs. I can not see how this is possible, but have wondered what fits and interchanges. I would change the outer CV if I needed to. I just don't see the room for material removal on the knuckles. So then the knuckles would need to be replaced leading to larger brakes. I have probably 10 old BRGs in my stall. I also bought knuckles at one time. I will do some measuring and post it. I have Cav, Beretta, Grand-am, abd late model caddy hubs around currently.

quote Originally posted by AJxtcman: 5 on 100mm Buick - Century, Skylark, Skyhawk FWD '79-'87 - LeSabre, Riviera, Somerset '85-'88 Chevrolet - Beretta, Citation, Cavalier, Celebrity, Corsica '80-'89 Chrysler - Laser, Lebaron '85-'87 Dodge - Daytona, Aries, Charger, Lancer, Caravan '85-'89 Oldsmobile - Calais, Ciera, FWD '82-'87 - Firenza, Omega FWD '79-'86 Plymouth - Sundance '87-'89 Pontiac - 6000, Grand Am, J2000, Sunbird, etc. FWD '82-'87 - Fiero '82-'88 5 on 115mm (4.527") Buick - Century, Electra, LeSabre, Regal, Riviera (some) '83-'89 Cadillac - Allante, most others '84-'89 Chevrolet - Celebrity '85-'89 Oldsmobile - Regency, Ciera, Cutlass, Delta 88 '84-'89 Pontiac - 6000 '83-'89 - Bonneville, Grand Am '86-'89 I will add on

Are these hub only or hub/rotor combo?

I have a 1987 Buick Century with a 2.5L Duke and TH125C auto. The front vented rotor is separate from the hub.

The knuckle off my Buick appears (AKA eyeballing it) that it would fit the Fiero rear. However, you are looking at changing the brakes too with this mod. EDIT: And losing the e-brake.

[This message has been edited by Hudini (edited 02-22-2007).]

quote Originally posted by jscott1: If you get an 88 you can redrill the front hubs up to at least a 5" x 4.75". (5" x 120.7mm) Corvette pattern.

Up to 5x130mm (Porsche pattern), in fact ;-)

quote Originally posted by Hudini: I have a 1987 Buick Century with a 2.5L Duke and TH125C auto. The front vented rotor is separate from the hub. The knuckle off my Buick appears (AKA eyeballing it) that it would fit the Fiero rear. However, you are looking at changing the brakes too with this mod. EDIT: And losing the e-brake.

Whats the bolt pattern?

Left: '84-'87 Fiero
Right: Cutlass
Hub: 5x115mm





David Breeze

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Pantera Rebody Kits

The list I added above was the Wheel stud bolt pattern.
I am looking up information for the Hub centering size, knuckle bolt pattern size, knuckle bore, the axle spline count and axle diameter. I will be posting it. It will take a little while. Lost of options and rare options like 6000 AWD car along with FWD and AWD mini vans.

quote Originally posted by cire36: Whats the bolt pattern?

AJ's post says it is 5X115. The car is located in Detroit and I'm at home right now so can't verify the spacing. My '86 GT shares many components though. Kind of funny that I can use info for '87 Duke owners to fix my old Buick.

http://fiero.cc/fiero-tdc/m...s/Boxster/index.html

quote Originally posted by 3800superfast: http://fiero.cc/fiero-tdc/m...s/Boxster/index.html

Nice. I think I might have to give this a try espacially since my rear hubs are already apart (see thread "How not to tow your Fiero)

I've been doing some research in the archives so this is a good chance to bump this thread...

Per Will in another topic, '95 and older (up to '96 for the Century) HD A-body(Celebrity/6000/Ciera/Century) uprights/hubs/brakes bolt on to replace the 84-87 Fiero parts (for the manual trans). - For the Autos, the outer tripot would need to be changed due to the axle spline differences - how this is done would need to be confirmed. This change gives you the larger bearing, 10.5" x 1" vented rotors, and the 5x115mm bolt pattern.


Bob

http://www.adaptitusa.com/i...geAction=Custom&ID=4

http://www.skulte.com/boltcircle.html

lots more usefull info in their information area.

David Breeze

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Pantera Rebody Kits

quote http://www.skulte.com/boltcircle.html lots more usefull info in their information area.

Wow...That's a name from the past. I remember when he first started SPD with his T56 adapter. We were members at thirdgen.org at the time. He had a pretty wicked turbo Camaro if I remember correct...


Sorry...Back to your regularly scheduled program...

I just got back from a local salvage yard $80 lighter, but I came back with the hubs, uprights, brakes, rotors, and axles off a late 80's Celebrity station wagon. A quick review looks like it will all bolt up.

Bob

quote Originally posted by RCR: I just got back from a local salvage yard $80 lighter, but I came back with the hubs, uprights, brakes, rotors, and axles off a late 80's Celebrity station wagon. A quick review looks like it will all bolt up. Bob

Why not just send your rotors and rear hubs to Moser http://www.moserengineering...es/shopservices.html and have the holes filled and a new bolt pattern redrilled for what looks like about $85 a pair, you have already paid enough to have one pair done and you still have a lot more to go with the used parts. I just sent off an G6 axle to have shortened and splined for the driver side of the 6spd.

[This message has been edited by Joseph Upson (edited 07-27-2007).]

quote Originally posted by Joseph Upson: Why not just send your rotors and rear hubs to Moser http://www.moserengineering...es/shopservices.html and have the holes filled and a new bolt pattern redrilled for what looks like about $85 a pair, you have already paid enough to have one pair done and you still have a lot more to go with the used parts. I just sent off an G6 axle to have shortened and splined for the driver side of the 6spd.

Sounds like a good deal...I wish I would have seen that previously, except how do they increase the size of the bearing and give me larger ventalated brakes?

Also, I'm doing an Aurora swap, so the axles I'm using are different.

Honestly, that's good to know because in all likely hood, I may change the bolt pattern...

Bob

[This message has been edited by RCR (edited 09-01-2007).]

UPADTE!

I have the rears figuerd out. I actually figured it out on my own (I forgot I posted this thread). I found that 90-93 Pontiac Transport "front" spindles are exactly the same as Fiero "rear" spindles except they have a larger hub / bearing assembly with the 5x115 pattern I was looking for. Got them from a yard for $15.00 ea (including hubs). New hubs from Auto Zone are about $50.00 ea (non ABS). I also found some Ford Aerostar (rear wheel drive) fornt roater / hubs. I had the rotor cut off so all I have is a hub now. They use the same bearings that are used in the Covaire hub conversion thread (don't remember the author). In that thread, he used thin wall (0.032) tubing to mahe the larger outer bearing O.d. work with the Fiero front spindle. I cannot find tubing like that anywhere. I went to his site and asked him where he got it but I havent heard anything back from him . If anyone know where I can get sume, that would be great. I have designed the inner ones and can have them made but I want to wait until I know can have the outers taken care of.

I would post pics but I cant get PIP to work (wont get a profile).

Could you do me a favor and measure the over all diameter of those hubs? Mebbe they could be drilled out to the Chevy 4 3/4 bolt pattern!

TIA

Larry

I looked at the Transport/Silouette/Chevy(whatever) hubs, too. I felt the brake rotor was just too big to put on the back. Although the 11'ish inches was fine, the thing was about an 1.25" to 1.5" thick. That thing was heavy and more than I'll have on the front, so I went with the 10.25" x 1" of the HD intermediates.

Bob

PS, the hub diameter is about 5 5/8"

I have everything cleaned, painted and temporarily mounted. Everything fits great. Anyone else doing this?

Also a bump, because I needed Joseph's Moser link...

Bob

quote Originally posted by RCR: I have everything cleaned, painted and temporarily mounted. Everything fits great. Anyone else doing this? Also a bump, because I needed Joseph's Moser link... Bob

which hub did you use for the front?

quote Originally posted by RCR: I have everything cleaned, painted and temporarily mounted. Everything fits great. Anyone else doing this? Also a bump, because I needed Joseph's Moser link... Bob

Any pictures to compare the peices?

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3.4L S/C 87 GT www.fierosound.com
2002/2003/2004 World of Wheels Winner &
Multiple IASCA Stereo Award Winner

I have not done anything to the front yet. I'll cross that bridge when I get there.

I'll get pics posted when I pu;ll them from the camera...

Bob