Who should I buy a 727 or 904 from?
Auto transmission companies/work since the beginning of time have charged WAY too much and act like it's a black science... It's not limited to the mopar community!
TF's are so simple a monkey could build them. Grab a video, ATSG manual and munroe book and you can build a stout trans for less than $400 with a bunch of frills in it. I can build solid 727's for about $200-250 in parts. Does it Others I see charge north of $800 for the same stuff.
There's a local guy that builds some great stuff, some of it running low 9's on juice for under 1K. Doesn't have a billet drum in it, but that's an easy upgrade if you wanted it. Last one my friend got, with a brake was ~$800, add a drum and it's 1300-1400.
Pick your parts, pay your money.