1965 Dodge Dart stock differential advice

I went through this recently. If your 7.25 is bad, you are better off finding a good replacement for a couple hundred bucks or upgrading.

Finding parts for an early 7.25" is difficult. I had to have a local machinist make me up pinion preload shims because nobody sells them including Dr. Diff. There are some shims listed but those are the pinion depth shims. The only axle bearings available are chinese and in limited quantities. I think I bought the last "standard quality" one from rock auto. I bought NOS leather lip axle seals from ebay.

Everyone I called said, "We deal with 8.25" and 8.75" rears. No one has asked us to rebuild a 7.25" in decades."