Recommendations for mail order transmission?

George Jets said
The OP needs to re-think his task and rebuild the actual transmission that is in the car now.

Then you know what you got. Some of the used cores are basket cases in rely tuff shape.

Like our government lying to everyone to hide the truth, those selling you the "cores" will say most anything to get them sold and turn them into money.

Have to remember the good stock is pretty much used up. Reminds you of craigslist rule: Don't believe a word until the person selling has proven trustworthy.

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Fresh Built 904 pictured here.

Edit:
Besides putting in a transmission out of a different car, makes your car no longer a numbers matching car.

Personally, I ain't trying to sell any cores, I have 3 extra transmissions, that I pulled, myself, outta running vehicles. I kick my self in the ***, daily, for letting go, getting rid of, ect, all the Mopar Parts I had. At one point, I sold Jerry, from J@J, 5 70 Challenger grills, so I didn't have to take em home. I had 10 doors, and 4 decklids. The amount of mid 70s D Series stuff I had was sick. It sucks. That's not to mention all kinda other stuff, I'm sure most of the Members here can relate.