If I format in my main puter and then put it back in the 486 do you think puter will see it as 3.2gb then? Any input would help me out alot.
No, the partition table is irrelevant to the drives geometry, the 486 BIOS can't handle that large a drive. If you can't find an updated BIOS, you can either load a drive overlay on it, which themselves cause problems usually, or boot from a different device like a floppy.