Difficultly: Very Easy
Tools: Rachet, 1/2" Socket, 1/4 Allen key, portable rotary tool with brass wire wheel. Shop rags, and drip pan, your choice of beer.
Time: Few hours of slowly working.
Ok so I ordered a Mag-Hytec Rear Diff. for its added capacity (~5 1/4 quarts), its dipstick, and magnet. Plus it adds something like 100RWHP
Tools of the trade: Torque wrench, 1/4" Allen key, 1/2" socket, rachet, dremmel with brass wire wheel, shop rags, latex gloves because I can, and a drip pan
Place drip pan under the rear diff. and using the 1/2" socket start to remove the bolts, i would leave the top two in but loosened so you don't have to hold the rear diff when draining it out.
Keep the little tag for later and reinstall it for later references:
I did have to use a little mechanical agitation to break the seal and remove it:
After all the old gear fluid has been draining completly remove the rear diff and use the shop rags to clean up the old gearing inside.
Now I covered the gearings and used my dremmel with a brass wire wheel to clean up the outter rim of the diff. to clear off any old gasket material and what not and prep it for the o-ring seal that the Mag-Hytec pan uses:
After your statisfied you can remove all the shop rags and replace the old diff with the new Mag-Hytec cover using the 1/4" allen key and a torque wrench and tighten it down to 30 inch-pounds:
I used Royal Purple Max-Gear to fill the new diff. Took me 5 bottles to make it perfect in the middle of the dip stick.