12 bolt set up

[bdl1503]

I am new to this forum and have a question, anyone know of anyone in the central Ky area to set up a 12 bolt? I broke the carrier housing and spiders in mine and after much reading and studying I ordered a new posi unit, ring and pinion and put it together myself. Seems to work fine with no whining but I have a vibration, really bad around 55-60mph. I feel confident its something I have done because it wasn't there prior to breakage. Any suggestions on a good person to straiten it out would be appreciated.