But please don't post immediately any thought or question that comes into your head. Have a navigate around the site, and do a search first. You will find that thousands and thousands of questions have been asked and answered before.
A quick 5 second search by typing in "powertrain" would have come up with your answer!
Links just for you below;
Holy Sh#t. After doing this search, I now realise how many people do this. Especially with just this issue alone!!! Any problem becomes an immediate thread....but it doesn't need to be. Most of the links below are sometimes only weeks or months apart in the VZ Commodore Section. I shake my head in disbelief.