1955-1964 Chevy Impala Rear End 3rd Member Posi Differential REBUILT1955 1964 Chevy Impala Rear End 3rd Member Posi Differential is an original GM part. The 3rd member housing has been inspected and cleaned with new ring and pinion (Elite), posi differential (Yukon Duragrip), bearings (Koyo or Timken), pinion yoke (1310 series u joint). Professionally assembled (expect 2 3 weeks to complete). Requires 500 mile break in. CORE REQUIRED SELECT YOUR OPTION: FAST We charge for the core upfront and ship out the