Servus people, I don’t have any more glimmers of how to get ahead and thought I could get help here. I have to get a shorter translation on the rear axle and the parts dealer in the USA asks me now whether I have “C-Clip” or “Bolt-in” axles… I have to fit unfortunately and don’t know what I have now. On the differential housing I have “GM2” and “N1235542″ and it’s a 10-Bolt 8.5” as much as I know… I have nen ́74 Firebird with currently 3.08 translation and just di e 10-bolt as an info for those who can help me to clarify this question… Is there an identification, similar to with engines via VIN or with gearboxes with the number of screws on the oil tank, with which you can decrypt what you have now – C-Clip or Bolt-in Axles – without having to disassemble everything? I hope there is a specialist who knows Pontiacs (BOP axes) and can help me… Thanks