[SS Tim]

That would be an HO52 then and very likely the stock axle. Now you need to decide if you want to upgrade the brakes or just put in a locker. Couple of things I would do the help the decision process would to be pull the pumpkin and take a look around and see if it has worn or damaged parts. Rebuild parts exist but are more difficult to find. Another would be to measure the front track now that you have disc brakes and match it to the rear. From the pictures it looks like you gain about an inch on either side swapping brake parts.