I'm trying to make the 427 2+2 a roller and the pinion and ring gear bearings are a bit noisy and the carrier is scored by the spider gears. I can replace the open carrier with another out of a spare differential but thought if there is a posi available for, dare I say, cheap I would look at that. 

So, does anyone have an inexpensive 2 series posi to sell? Please pm me. 

Thanks, Eric