I have an auto trany behind a turbo 4 banger 4runner. I have been thinking about replacing mine as well. There are two types, the A340H is the one I have and the A340F. Both are married with chain driven t-cases. The A340H cannot be separated from it’s t-case (use the same fluid).
http://www.4x4wire.com/toyota/faq/parts This site is pretty good to help find out whats in your rig.
I have been pretty happy with mine until lately. It would occasionally pop out of gear on the tough stuff (maybe because of a bad trany-mount) so I just hold it down in low when I do something of consequence. I put a lock-right in the rear and now that I get better traction the chain in the t-case slips (I think). There is a distinct popping in the floor between the two seats when I'm on the tough stuff and when I turn sharp on slick rock. I am going to put in a new chain and see how well it does. Also when I get my vehicle on an extreme angle (like Dump Bump) it comes out of gear even though the shifter is stationary.
I will probably never be able to get enough performance out of it to run larger tiers than 31s with out a ring and pinion upgrade. (maybe 32s could work)
I know a lot of people will think this is messed up behavior for a trany but I have made it up some pretty cool stuff with stock gearing and tires. If you are not too hard core you could get a lot of use out of it.
I would be interested in anyone’s input on this kind of trany swap.
PS. Mine is a little funny shifting between gears too, especualy in 4low when I want it to shift into second or thrid on straight aways.
