so ive got a 2001 gmc 2wd ext. cab im thinking about converting to 4wd, 2wd just dont cut in the snow. im thinking its got a 4l80e bolted to my 4.8 just have not crawled under to check yet.would i have to change trans? would my 208 from my 87 jimmy bolt to the 4l80e?or would i have find a 4wd version?any one done this conversion before? please post up any ideas or feel free to correct me on the type of tranny i might have.