[Spyro235]

Looking forward tot eh front half update- I can't afford to lose awd! Thanks again for experimenting on this, I'm sure there are at least a few of us that will be following suit. I just realized that the n55 35i's use a 3.15 too, and that the differential seems to be the same partnumber. The side brace seems to be different though, so I'll be sticking to finding a 4.4L front, or really whatever ucsbwsr confirms to work. Prices look like I can get the rear for $130ish and the front for $150ish in NJ, with prices closer to $100 if I decide I'm good with spending a bit more time driving. I'm looking forward to this modification, as I would cherish less noise and less RPM at highway cruising. Removing the front diff looks a bit more involved than the rear, but not all that hard regardless. Apparently there's an special tool to remove the front half shafts, and I'm curious what happens there if we don't have the tools.

Just want to point out- lets say the diff swap is costing me $325- I've calculated out that for my personal vehicle, if I got a 3mpg gain from the change, it would net me about a 1.2 cent savings per mile. This means it would take me about 28k miles to break even as far as pure cost of this modification. To me, that's 2/3-1 year of driving, to someone who only drives 7-10k a year, I can't imagine efficiency mods will be worth it.