Maybe so, but looking at the trend of the shared parts between the GT and 3.7, can't rule it out. A set of 28 spline axles are no cheaper than 31s, same for the differential. Much less why have 4 part numbers instead of two to keep in stock for assembly. Things should be lean and mean business-wise nowadays. Streamlined.In 2010, the GT Trak-Pak came with heavy duty 31 Spline axles & differential ... don't know for sure, but I'd guess that all '11 GT's have this as std. now. This would be overkill for the '11 V6, so I'd guess Ford is using '05-10 GT spec 28 spline axles & differential here.
Doug
Maybe so, but looking at the trend of the shared parts between the GT and 3.7, can't rule it out. A set of 28 spline axles are no cheaper than 31s, same for the differential. Much less why have 4 part numbers instead of two to keep in stock for assembly. Things should be lean and mean business-wise nowadays. Streamlined.
FYI - All '05-'09 GT's had 8.8 with 31 spline axles, V6 cars got a 7.5 with 28 spline axles. Can't say what's in the '10-'11, but I know this is accurate up to the '09 models. Cars with the upgraded diff like the Bullitt and Shelby, or if you checked off the right option box for your GT, still had the same 31 spline axles but the trac-loc diff had stronger clutches for improved limited slip performance.
BTW, the standard rear ratio for AT cars in both V6 and GT's was 3.31:1 (again this is just up to '09, but I think it's probably the same for '10). 2011 V6's dropped that to 2.73 to get their 31 mpg hwy rating. I would think that is the reason some people have commented on the sluggish acceleration in 2011 AT cars, even with the 100+ jump in HP. Not sure what ratio is standard in the 2011 MT V6's, but I've heard the performance difference between MT and AT cars is night and day, so I'm going to guess the MT V6's have a better rear gear like maybe a 3.31, or at least a much lower gearing in 1st and 2nd in the trans than what the AT has.
you're wrong. the v6's 3.31 is an option that the auto or MT can have.
base is 2.73 for AT and MT cars across the board.
the sluggish is from the slushbox.
Which model year are you referring to? I already said the 2.73 was standard in the '11 V6. If you're talking about '09 cars, then you're wrong, 3.31 is the standard gear for the V6. I know because that's what came standard in my car, not as option, I have the window sticker to prove it.
Any official word from Ford on what rear end is in the '11 V6?
I'm about to replace my stock 2.73 rear end with 3.73. I don't want to upgrade the gears and then find out that I should've also upgraded the LSD.
I guess my question is: If the '11 V6 stock is a 28 spline LSD do I have to also upgrade to a 31 spline in order to gain the full performance from the 3.73 gears? or will the 3.73s work well with the a 28 spline posi?
Axle spline count doesn't matter if you are just changing gears.
3.73 is too much gear considering the super low first gear in the two 6 speed tranny's, I would recommend a max of 3.55.
And knowing Ford's history, it wouldn't surprise me at all if they use 28 spline axles in the 2011 V6's 8.8 rear. The bean counters would mandate it just to save 10 cents a unit.
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