front wheel hub interchange

The bearing is the same part number for both applications in the same year. This style requires special tools and a lot of time to replace. To make the job easier, many aftermarket suppliers offer repair kits that include a new hub. It is that hub that could be different. Specifically, the number of studs, their spacing, and the hub's offset could be different resulting in a different part number. The hub is not listed for the Geo on the site I use for reference, but it is for the Toyota.

The hubs are different. The Corolla hub is a different bolt pattern and uses a different hub diameter.
The reason is that the Geo Prism is a joint venture of GM and Toyota. The hubs that the rims bolt to are GM spec. only. The internal bearings are the same part number because the Prism is designed with hubs that you press apart to replace the bearing unit and they used a common bearing that Toyota was already using in the Corolla and Sprinter.

This is the process if you have a press.
https://www.2carpros.com/articles/bearing-press-how-to-use

It can also be done on the car with a slide hammer type puller, or an on car press type unit.
Couple videos showing those methods.
https://www.youtube.com/watch?v=2IcUFGM0wWk
https://www.youtube.com/watch?v=EQLge25pUQI
https://www.youtube.com/watch?v=D4PK1jXhppE

The bolt pattern is the same. I have 1991 Toyota Corolla stock steel rims on my car right now and they bolt up correctly and been driving on them for over 15,000 miles. So I know the bolt pattern is correct. I think when Geo changed back to being called a Chevrolet they went to a five bolt pattern hub. My bolt pattern is 4 X 100 which is the same as a 1988 to 1992 Corolla.

Get information, thanks. Please use 2CarPros anytime we are here to help.

Best, Ken

Does anyone else have any input on this hub problem? All parts stores only have button pushers working at them. No real mechanics anymore. Also when I change the bearings I want to add more grease. What type and color should I use. Should I remove all the grease out of the new bearing or just add it to the original stuff? The grease in the bearing is white and looks like lithium grease. Does not look that thick.

The bearings usually come with the correct grease, but if you want to add more you will need to clean out ALL of the grease. Mixing grease unless it is the same is not a good idea. As for what to use, that is a regular ball bearing design so any good wheel bearing grease would work.

Be careful that you press the bearing in using the outer race. Don't miss the rear circlip.

The hub (part 20) doesn't show in GM's parts data. If the Corolla fit they would still list a valid part number.
What is bad/damaged on yours? If it's the seal surfaces you might be able to find a shop that could TIG that up and turn it back or turn it down and press a sleeve on. Wouldn't be cheap but it would work. Or get one of the Corolla hubs and measure it up. Maybe it could be altered to fit.

Or go on www.car-part.com/ and see if you can get a complete spindle with hub. There seemed to be a few listed.

The damage is the seal area but the bearings got so hot they turned the hubs blue. they are so bad that new bearings will not push on them correctly. Had a new pair of hubs pulled at the store for a corolla and only thing I see is the flange-plate which the studs are mounted to is thicker. My hub is 8mm thick while the corolla's is 11mm and the studs are a little longer. Steve W. thank you for trying to help me out! Car is down and the machine shop told me they can't fix the hubs. Its funny that the bearings and the seals for both cars are the same part number but they don't list the hubs. Thank you again!!

Alrighty then.

Maybe we need to go with the correct parts,

But just obtain 'em cheaper?

You may need to do a little 'updating/ homework' to make this work for you. Usually you can find better ones than offered on their site!

Read the 'tips' (like max out the promo then start a new order, instead of wasting the promo on the whole order.)

Please see the methods that save me so much, see my answers in this link.

https://www.2carpros.com/questions/2001-dodge-neon-milage-just-want-put-fliuds-their-locations

Lets hear some good news!

The Medic

Go over those hubs and measure everything real close.
If that flange is the ONLY thing different then you could simple have it faced thinner. It may not even need that if the caliper can still fit on the slides with new pads in place.