I need to replace the carrier parts as mine has a 241 gear but has some worn parts so I started to look for a complete used posi . I would like low 3--'s to mid 3--' , I have access to just the carrier 410 w/installation . This gear seems like it would be too low, It is a driver not a race car. Is there anything I should check on a used unit before buying it ? Thanks for any advice !!!!!!!!