We've got two 99 Dakotas, one is a V8 318 with an automatic transmission and the other is a V6 with a 5-speed manual transmission. The V8 has a bad frame but good motor, the V6 has a bad motor but good frame. We were wondering if we could take out the V6 (manual) and replace it with the V8 (auto) but keep the manual transmission. Is this possible? How difficult would this be?