I am using a Dak frame for my streetrod. I want to use a 5.2 and 46RH but have heard the 46RH's are not very durable. Will any other or better trans interchange with minimal mods. Or will a rebuild be necessary?
FYI, I am using the Dak wiring harness to keep cost down and everything plugs up right

You must be talking about the 46re trans. They are good trans if you take care of them. If you get a used one then you may want to open it up or have it checked out. A freshly rebuilt trans is always better. Im putting a 5.9 RT motor and 46re trans in my 96 at some point. Got the trans already built just waiting on money to finish the motor. Using a factory harness is the best idea. Thats another thing i need to get also.