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I did this a couple weeks ago and finally got around to doing a How-To on it...
There are two ways to change it...use a hand suction pump (easier) or remove the differential cover (slightly more involved). I chose to remove the cover.
Items Needed:
75W-140 High Performance Synthetic Rear Axle Oil
4oz. bottle of Additive Friction Modifier XL-3 (EST-M2C118-A)
Hi-Temp RTV Silicone Gasket Maker
Gasket Scraper or Putty Knife
1/2" ratcheting wrench or ratcheting socket
3/8" male socket extension
Flathead screwdriver
Drain Pan
Shop Rags
Lint-Free Rags
1. Raise the car and support it securly on jackstands.
2. Move the drain pan under the differential, keeping shop rags close by. 3. Using the 3/8" male socket extension, remove the fill plug from the front driver's side of the differential. As you loosen the plug you will hear air going inside the differential housing. Once you have removed the plug you will probably see small metal shaving attached to the back of it. The plug is actually magnetic to attract any metal debris and keep it from interrupting the gears movement.
4. Using a 1/2" ratcheting wrech, remove the majority of bolts on the differential cover while leaving the top bolt in place but loose.
5. Pry the cover away from the mating surface with a flathead screwdriver carefully so not to bend the cover. The fluid should begin draining out into your drain pan below. Once the fluid is almost completely drained, you can remove the last bolt at the top holding the cover in place.
6. Remove the cover. (Tip: I found it easiest to working it up and to the passenger side of the car without removing the panhard bar .)
7. Use a lint-free rag to clean the inside of the cover and easily reached areas inside the differential housing.
(Note: This may be a good time to inspect the gears for any potential failure; chips, cracks...etc)
8. Scrape off the old mating gasket with a gasket scraper or putty knife making sure the surface is free of any old gasket material. After removing the old gasket, the mating surface should be clean and dry.
9. Apply approxiametly a 1/8" bead of Hi-Temp RTV Gasket Maker (I used Permatex Ultra Black) to the cover, routing the bead on the inside of the bolt holes.
10. Install the cover on the differential housing (opposite of #6 above) and hand tighten all bolts until the RTV gasket maker begins to squeeze out. (Note: Do not tighten with a wrench.)
11. Allow gasket to dry for 1 hour then tighten all bolts to 33 ft./lbs in a X pattern using the 1/2" ratcheting wrench. 12. Fill the differential housing with a 4oz. bottle of Additive Friction Modifier (I used Champion Axle Additive Concentrate) and fill the rest with High Performance Synthetic 75W-140 Gear Oil (I used Royal Purple Max-Gear) until the fluid is level with the bottom of the fill hole. Note: A V6(7.5" axle) has a capacity of approxiametly 1.5 liters while a V8 (8.8" axle) requires about 2.0 liters. I ended up using about 2.5 liters after the additive to get it to the bottom of the fill plug.
(Tip: Due to the location of the fill plug, I attached a 6' plastic tube between the fill hole and the new bottle of gear fluid so I could refill the car laying next to the car on the drivers side. The tube was from a suction pump for a fish tank .)
13. Install and tighten the fill plug. 14. Remove jackstands and lower the car to the ground...DONE
Note: A representative from Royal Purple told me that I may notice a faint noise from the differential for a few days until the new fluid and additive impregnate the clutch pads.
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2006 Premium Mustang GT
5 Speed | 3.55 Gears | BMR Suspension | Bumpsteer Kit | H&R Super Sport Springs | Konig Beyond 18s |
Foose Stallion Hood | Cervini Type III Chin Spoiler
great write up man one thing you should of done was got a nice diff cover but i guess you dont see it on our cars im use to my truck haha
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looks- roush spoiler/cdc aggressive chin/blackout panel/shorty ant/3d carbon grille/sequentail tail lights,steeda strut bar,
performance- full mac exhaust/ mgw shifter/che k-member w/tq limiters/ C&L racer and x3 brenspeed tune/ frpp 4:10s
waiting to go on:eibach pro springs, koni STR.T shocks and struts
YANKEES WORLD CHAMPS #27
Yeah, I guess someone could have spent $175 for an aftermarket cover with a drain plug but that someone wasn't going to be me . It would make changing it easier next time but how many times you plan on changing it . Aftermarket covers do look cool though.
__________________
2006 Premium Mustang GT
5 Speed | 3.55 Gears | BMR Suspension | Bumpsteer Kit | H&R Super Sport Springs | Konig Beyond 18s |
Foose Stallion Hood | Cervini Type III Chin Spoiler
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How To: Change Differential Fluid
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.. "Sally" is getting "balls" ...forged V8 swap in progress 
