g'day gbentink, i'm assuming when you talk about final drives you are talking about the difference in ratios in the transfer cases ( one being an auto and the other manual ) as i'm pretty sure the ratios in the diff 4:11 are the same. As on the subject of economy, i believe mine gets slightly better economy (manual) against my brothers (auto). we have done a few trips side by side over about 500km one way and on the highway mine (manual) was getting about 10.5 litres per 100 which really ***** him as mine uses less fuel and has more power. win win for me and his doesn't seem to blow any more smoke than mine. if you could tell me the difference between a manual and an auto injector pump would be much appreciated thanks plumma