2011 Shelby GT500 Performance Package 8.8 gear oil

[Totalpkg]

Sorry guys, I'm travelling and don't have access to my manual. What does Ford recommend for gear oil wt/spec. I was leaning towards Amsoil and friction modifier, but any recommendations is appreciated. 3.73 gears that came with performance package, and I'm installing the FRPP girdle, so I'm gonna change the gear oil.

 

[96gt02]

75W140 is the oil spec, does yours have a Torsen diff or was only 13/14s? If it does have a Torsen then no friction modifier, if it has the regular Tlok then either ford, tranX, or amsoil friction mod will work. and if you have a noisy rear, doubling up the amount of friction mods tends to quiet things down a bit.

 

[Totalpkg]

I have no idea what came stock in the 2011 GT500 pp. All I know, its 3.73 gears. Its super quiet, no issues whats so ever, so I wanna keep it as is.

 

[Pribilof]

Severe Gear® 75W-140

2.5 quarts to fill

Slip Lock

I used all 4 ounced in my SVTPP.

 

[RedVenom48]

11-12 PP cars had the standard Ford 8.8 trac-lok differential with the upgraded carbon clutch discs. 13-14 PP cars got the Torsen.

+1 on Severe Gear. I rebuilt my diff clutch packs and did not add slip lock to the oil per AMSOIL tech line. Their advice to me was use of Slip Lock will not hurt anything, but 75W-140 Severe Duty was formulated to work with LSD clutch packs. If had any chatter they wanted me to add a little slip lock until no chatter. Road tested the car, no chatter. No Slip lock in mine and perfect diff operation with a year of DD use.

 

[Snoopy49]