I was working on my 3.08 to 3.73 gear swap yesterday at my shop. I already had the differential off the car (which is much nicer than working on gears while still under the car) :thumb: Just a little word of advise to anyone thinking about doing gears themselves, plan a whole weekend to do it. Unless you have done gear swaps before, you will most likely run into obstacles. It took me an hour to get all the suspension and brake components off the housing, not to mention the fact that i crushed both abs sensors while trying to get them out. If your car is more than 5 years old, i would automatically plan on replacing those damn things. They were so corroted in place that there was no way to turn them or tap them out, without cracking the plastic pieces. I screwed around with dissassembly and pinion depth for about 2 hours. I went through 2 crush collars by trying to set the correct bearing preload on the pinon. Word of advise (buy some extra crush collars, you'll need them) After that i ran into a critical road block, i couldn't get the bearings off the differential carrier. I tried bearing separators, and jaw pullers, but neither worked. Now I'm going to take the carrier to a tranny or machine shop to have them pull the damn things off. Needless to say that took another couple hours in trying to get the bearings off. After that i decided to call it a day. Once i get the new bearings on that thing, it will all be down hill from there. All i would have left is to pop the ring gear on the differential and put it back in the housing. Hopefully the backlash shouldn't be an issue, because the shims that were in there were thick single pieces for each side. That should be easier than trying to get all those thin shims into place. After all that bitching, here is the real reason for the post. (i just wanted to give you guys a heads up on installing your own gears) Once i got the axle down to my shop, i ran into a little surprise when i opened the axle cover. There was a differential stuffed in there, that i have never seen before. It had a date of 9-02-1999 on it. Which makes me wonder why the owner before me didn't have them swap in the 3.73 gears while they replaced the differential?? I was expecting to see the standard issued trac loc differential, but instead i found this. http://www.fordracingparts.com/parts/part_details.asp?PartKeyField=2520 Upon some research i found it to be this ford racing Torsen T-2 differential. Ford says it's one of the finest differentials on the market today. I think they are used in the late model cobras. I have never heard of this before, and i was wondering if any of you guys have heard any good or bad news about this differential?