Carrameow,

Not only should you replace the filter drier after any compressor failure, you should also COMPLETELY AND THOROUGHLY flush the entire system to remove debris that will destroy the new compressor.

I have been there, done that with rebuilt R4 compressors. You would be very far ahead by purchasing a new R4, THOROUGHLY flush the sytem, replace the filter drier and then install your new compressor.

Additionally, with the system converted to 134 your high side pressure is significantly higher putting further strain on the compressor. Since it is necessary to flush and replace the filter drier, now would be a great time to reverse convert to R12.

Best of luck with it,