You cannot exactly convert 001 archives to 008. They are just pieces from a split multivolume archives. You need to gather all the pieces before you can extract the contents, which you can of course repack again.
Convert Compressed file from a multi-volume archive (part 1) to Compressed file from a multi-volume archive (part 8).
We found 7 software records in the database related to .001 to .008 file format conversion.
Microsoft Windows software - convert 001 to 008 on Windows
Popular open source file archiver with a high compression ratio
Convert from 001 file format
The tables with software actions are a good pointer for what a certain program does with various file types and often may give users a good hint how to perform certain file conversion, for example the above-mentioned 001 to 008. However, it is not perfect and sometimes can show results which are not really usable because of how certain programs work with files and the possible conversion is thus actually not possible at all.
One of the oldest and most popular shareware file archiver and data compression utility
A free open source archive utility
Apple macOS / Mac OS X software - convert 001 to 008 on OS X
A backup and archive utility
Mac version of the popular utility
Linux/Unix software - convert 001 to 008 on Linux
A Linux application used as frontend for popular compression tools
A file archive manager