I currenty run the stock RA60F (05 tacoma, 4wd) six speed, and have found it to be very unreliable. I replaced the factory trans with a new one from Toyota at about 30,000 miles on the odo, and now at 75,000 the new one is also junk. I understand some of the internals have been updated in the 2011+ six speeds, but I would prefer to move to something more reliable. My question is what else can I swap in? Is the 5 speed R155F (from behind a 2TR-FE 4cyl) direct bolt in swap? What about swapping in the A750F automatic? I know the auto bellhousing will match up, but what about overall length and the ECU? I know this is the right place to ask the question, you guys are a bunch of Toyota geniuses. Thanks!
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