Tim thanks for the advice about the 3.90 gears although I suspect they may be hard to find in good shape. I have the SM420 trans. I am actually pretty happy with the 3.55's except for fantasizing about pulling a boat or an old canned ham trailer with it. Realistically, the stock brakes and the huge jump in insurance costs will probably keep me from ever doing that. (It currently has very reasonable classic vehicle insurance).
