1968 Dart sudden rear end noise.

1968 Dart 270 said
Ok, is there an 8 1/4" rear (since those are better than the 7 1/4" but cheaper than the 8 3/4") that will drop in with NO modifications. I do NOT want to monkey around with driveshafts or anything else. It's for a stock daily driver and I just want to get it back on the road and be reliable. I don't want the car in my garage for a year as a project. I basically want to buy a good used one bring it home and put it in the same day. If there isn't then I'll just look for someone with a good cheap used 7 1/4" with 2.94 gears

Answer, no.
The 7.25 has the longest driveshaft.
Th 8.25 and the 8.75, some say can run the same driveshaft, but I had to move springs back on one swap. and this driveshaft is shorter anyway than a 7.25.
IMO you are just pissing in the wind, until you go look.
chances are that all you need is a case and the guts, and with a back cover, the swap goes out an in, in about an hour and change. It'll take you almost that long just to get the back jacked up high enough to shimmy under.