I recommend a couple twenty minute freeway drives with ample cool down time in between if possible to seat and lube bearings and such, then if no strange whines or gear noise---I say its party time..............Dan
I dont know about yours, but mine was shipped with gear lube in it already.
Its a good idea to drain it and replace it with some Mobil 1 synthetic gear lube, and a bottle of friction modifier from ford. The friction modifier is nessesary if you are changing the fluid. You can get the friction modifier from a ford dealership cheap, it doesnt have to be the FRPP stuff.
3.25 pints or 1.5 literes of gear oil
F3TZ-19B546-MA is the part number for the friction modifier.
note: mobil 1 is just my personal preference, use any quality synthetic gear oil you want. I also got the pumpkin from Justin.
Dont forget to change the bushings when you install.
As for break-in, heat it up by doing some easy driving, then let it cool down for a few hours.
I don't know for sure about the rear bushings but I've done the fronts on my bird and they were from Moog bought from NAPA and they were polyurethane. The Royal Purple lube is fine by itself. All the friction modifier is is an anti-foaming agent to insure good lubrication for the friction surfaces. You fill the rear until it runs out the fill hole...............Dan
I got an FRPP rear end from Justin too, its going in this weekend. I wasnt going to drain the fluid since its already filled, but now I feel like I should. Is the Mobil 1 that much better than what ford puts in? Anyone that just left what Ford put in ever have problems with their FRPP pumpkin?
From the tech articles: Brake-in procedure for New Gears
Maybe not everybody know this but after the gear swap job you need to pre-heat the gears just like the new rotors. Here is how to do that:
First time you drive the car, only drive it about 15 minutes or so; DON'T accelerate hard or drive exremely fast
Stop the car and let the gears cool off for about 2-3 hours.
Then Drive again for about 30 minutes or so, no hard acceleration or fast driving speeds, and let the gears cool off again. Then the last time drive the car about 45 minutes or so, no hard acceleration or fast driving, you get the picture, then for the last time let the gears cool. After that give the gears HELL. If you don't do this break your gears may decide to whine.
For everyone else who plans on this mod it doesn't hurt to do it! if you can be calm enough to keep your foot out of the floorboard trying to test your new mod
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