Does your car jump forward a bit when you go to put it in first gear? Well, mine does, and I've heard a few people talking about this on the board here. I now know what this is and why. It is the rear differential, the viscous coupling. Cost: $1691 new. I was towed without my knowledge about two years ago, and I wondered why my car lurched forward when putting it in first gear and why it goes "bam" from the rear when shifting if I don't ease out on the clutch just right. The Mitsu service manual confirmed this. My car was also slightly damaged on the front spoiler (paint scraped off) from where they towed it, confirming that they did tow it from the front. Those bastards. I think I'll sue them now. A lawyer told me back then I have 3 1/2 years to file suit and recommended that I sue in small claims. Be very very careful when having your car towed and make sure it's on a flat bed tow truck!!