NEED AN ANSWER QUICK...REAR GEAR SWAPPING

i dont know

I'm no expert, but i'd think all 8.8's are pretty much identical as far as what you can put in them.

You would be better off just taking the whole rearend off..It will only take you a couple of hours if you never did it before..beware of the lower control arm bolts though..they are a PITA to remove!!

yeah i agree, to be safe take the whole rear end off. Its off acobra so it'd be better anyways. but an 8.8 should bolt up to an 8.8 .....

you can just swap out the eaton posi unit with the gears if you wish. the axles are not interchaneable, SN 95 axles are longer than fox axles. all of the clearances will need to be set. make sure you check the spline count on the eaton posi unit first. stock 8.8s are 28 spline and most people that change the posi tend to upgrade to the stronger 31 spline units.

your other option is to swap the complete rear.
SN 95 rears are slightly wider(about 1 1/2'') than fox body rears. The complete rear will bolt up, but you will have rear wheel clearance problems unless you get rear wheels with a back space and an offset to compensate for that 1 1/2''.

I would just swap in the Cobra axle. Not that hard to do. I run SN95 wheels, and I had to roll the fender lip for tire clearance.

If you mess with the pinion gear and such, you will have to reset the clearances or it will not run right. But you can just take all the internals out and use them in your 8.8 providing the splines are the same as was mentioned.

BUT, the easiest thing to do, especially if you have never installed gears or do not have someone experienced to do it for you cheap.....is to remove your rear end from the car, remove the axles, brake lines and brakes from your 8.8 and the Cobra 8.8. Install your Fox axles and brakes on the Cobra rear end and install it back in the car. The rear end housings are the exact same size for all 8.8 Mustang housings from 86-98 and are interchangeable. All the brake and axle parts will interchange with ease. You will keep the same width and get the good diff parts without messing with the gear install. It might take a bit longer than swapping the gears, but IMO it is a better deal than spending several hundred dollars on having a shop swap the gears and diff over. Then you still have a good Mustang rear end with intact and setup gears you can sell to someone else. Of course this all depends on the splines being the same.

Good luck!