904: should I switch to 727?

75Chimera said

Well, crap, forgot to put more pertinent info! I haven't gone through the engine yet, but will likely run a mild cam, and have the cylinders bored to the next size as needed. I have NO idea about final horsepower. I think stock was what, like 270-275? I'd like to increase that a bit just for bragging rights, but nothing crazy. I currently have the 3.91 third member, but I'm considering something a little shorter so I get a bit better mileage, more in town / longer drives drivability. If that makes sense.

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Keep the 904. They are a good transmission. Biggest problem was selecting rev with the choke fast idle on. Break the rev band. All the transmission shops on what seemed every corner years ago relied on the General's slush boxes. If they had all been built like the Mopar autos, there would have been far fewer. Try to find a trans shop now. I would look to 3.23 gears for a mainly street vehicle. Then down the road and you want even better fuel economy, you could install an O/D auto with the police/taxi shift kit. Durability w/o the neck snapping hard shifts. A 3.55 gear common in Dakota 8.25 rear ends would work also. Just find one with a good posi.