Searched but didn't find anything. Has there been any research into using the 97+ aluminum front suspension knuckle for front/rear of the Fiero.

The bearings are cheap. 12" brakes stock GM brakes are available and 13" brakes from the GXP can be found. It is also fairly easly to use the LS1 calipers.

Ran across this where they are modifying a Cobalt front knuckle, the w-body one looks to be able to be modified in the same way though I am unsure on the sizing and if it would fit.
http://coppertopautosports....ension-update-3.html

For the rear I know nothing would bolt up, but the modifications to make it work shouldn't be as extensive as some of the other designs I have seen threads on.

Yes it can be done, but it takes a fair bit of engineering especially for the front. Besides worrying about how to mount the upper ball joint, to get decent handling characteristics, you also need to redesign the steering arm. The W body like lots of front wheel drive cars is a rear steer suspension while the Fiero is front steer front suspension (where the steering rack mounts) If you just flip the knuckles left to right, you will have the wrong Ackerman. I have a Fiero in my garage that says it can be done, but you need to cut off the original arms and replace them with a bolt on setup. Wheel bearing may be fun too, depending on what bolt pattern you are looking for. For me I went with some from an early Cadillac CTS wheel bearings (2wd), with the 5*115 pattern, they don't require a bolt to compress the bearings like the W-body bearing. I am not a big one for sharing in progress pictures, hopefully after I get some miles on it I will make a build thread.

For rear knuckles, the W-body strut mount is at the wrong angle. The thickness of the block and the bolt size and center distance is different. Even if you used W-body struts, the angle of the attachment would give a LOT of negative camber. The Fiero strut towers are closer together at the top than the W-body strut towers.

The W-body knuckle mounts the toe link much lower than the Fiero knuckle does. This will worsen bump steer unless you carve on the cradle to relocate the inner pivot mount.

quote Originally posted by mwhite: Yes it can be done, but it takes a fair bit of engineering especially for the front. Besides worrying about how to mount the upper ball joint, to get decent handling characteristics, you also need to redesign the steering arm. The W body like lots of front wheel drive cars is a rear steer suspension while the Fiero is front steer front suspension (where the steering rack mounts) If you just flip the knuckles left to right, you will have the wrong Ackerman. I have a Fiero in my garage that says it can be done, but you need to cut off the original arms and replace them with a bolt on setup. Wheel bearing may be fun too, depending on what bolt pattern you are looking for. For me I went with some from an early Cadillac CTS wheel bearings (2wd), with the 5*115 pattern, they don't require a bolt to compress the bearings like the W-body bearing. I am not a big one for sharing in progress pictures, hopefully after I get some miles on it I will make a build thread.

If you're going to go to that much trouble, just build your own from scratch.

Like I said, a lot of engineering... I started with SusProg3D and designed my own suspension. Would I do it again, not likely. Too much work for a design that hasn't proven it self yet. Now if I get it out on the race track and it works well...

Is this the same as the 98 - 99 Grand AM , Alero, Malibu front spindles?

No.
W-body is Grand Prix, Monte Carlo, Regal.
The cars you mention are N-bodies.