The only program capable of handling .pea files is PeaZip, so if you need to repack .pea archives to .rar files you have to use the original tool. This is mainly because .pea files are encrypted, so you need the original tool to decrypt them - if you know the password.
Convert PeaZip pack encrypt authenticate file to WinRAR RAR compressed archive.
We have found one software suitable in our database for this conversion.
Microsoft Windows software - convert pea to rar on Windows
A free open source archive utility
Convert from pea file format
The table with program actions contains information about what each program is capable of doing with their files. This may be a good pointer for further searches for certain file conversions and help you find the converter you are looking for if our search result is insufficient for you. However, it is far from perfect and may sometimes show results which are not really usable because of the nature of the software handles the files. So a conversion that appears as possible, just because of matched actions, may in fact not be possible.