Ok so this has been getting on my nerves as it makes long trips horrible...but I had lockup when I first bout the 4Runner...it shortly went out after buying it and to no avail have I been able to get it back..I've replaced all parts with known working parts from my donor. I have replaced the torque converter and all the transmission solnoids. Not sure what else it could be but sort want to figure it out...it's a v6 a/t obviously so any pointers in the right direction would be great...and I do have the donor so parts to swap are easily available.