I have an 07 TRD with high mileage, and assuming the transmission will need to be replaced in the not too distant future. Only complaint is that two wheel drive version cant handle mud let alone anything else more challenging. when the trans gets replaced I am thinking of going to 4x4, has anyone converted from 4x2 to 4x4 - im assuming that we are looking at the trans & front drive. and a few other upgrades. Thoughts and advice ( even if the thought is hey your a dumb ass!! let me know why/ what im missing )