Tranny ID

Which is better depends on the application. Naturally the 727 is larger and heavier built but that doesn't mean the 904 is junk. IMO the 904 is especially far better for a smaller engine because it consumes less horsepower to spin it. It can be built to handle quite a bit of abuse. I've seen many a 10 second race car running a 904. If your wanting a transmission to go in your tow vehicle I'd recommend a 727.

BTW: The trans doesn't affect hwy driving unless it's an overdrive unit. Neither the 904 or 727 are overdrive transmissions. The rear end gear ratio and tire height are the main contributors in how a car drives down the hwy