Mine have a very light high pitched howl between 60-68 while on the throttle which goes away off-throttle and a whine over 80mph. I usually don't notice it unless I'm on a long trip or I am constantly on and off the throttle in the 60mph range.

 

Granny shifts, haha, I love it. Kudos to her for actually driving a manual. I started teaching my wife how to drive my 2014 GT Track Pack last summer. She did ok, but I know she doesn't enjoy driving manuals.

 

So I'd say both, reasoning here:


Gearing, the 3.73's will pull you through the rev's "quicker/easier" in each gear (Compared to 3.31, 3.55). You run out of each gear sooner as your rear end ratio goes up numerically. My Tbird has 4.10's with it's 3 speed C-6 @ 1:! in third. The car has awesome out of the hole but has no top end, it's all it can do to keep up with trucks on the interstate (speed is 75 here, It turns about 3800 sustained loaded rpm just to run that speed). All that being said at some point in my modifications when I swap differentials or something I'm going to try 3.31's in mine (I have 3.15 now).




Power, If you haven't had any experience with "fast" cars (no offense, just going off what you described), the 11+ 5.0 is a formidable engine, period. It squashes most of the 'classic' musclecar era motor's outputs. It wasn't that long ago (or is still true today) that building a "classic" naturally aspirated Windsor 5.0(the old school 5.0) to the 420+ hp level (the new school 5.0 power level), takes a directed effort and a decent amount of planning and good parts selection, not to mention precise work assembling everything. Ultimately, point being at one point not long ago 400hp was considered race car level power, now its just average, lol.

 

I bought my 3rd mustang in September, its a 2014 gt base model with 3:55s. I'm a big guy and been wanting to see if I could still get in a mustang, sure I could so I told saleman lets go for a drive, man was that a mistake came back from test drive and bought it lol. It's a blast to drive. First mustang was a 96 gt,2nd one a 04 mach that I loved, and now this one. Cant see buying a mustang v6 never happen for me

 

It all depends....

On intended use and power levels.

Stock 3.73 are great if you keep it stock. Once the power gets raised significantly they become less useful IMO. I know many disagree with that opinion.

I went from 3.55 at 475 rwtq to 3.73 and 650 rwtq.

I should have stayed with 3.55 as the current power levels can easily over power the traction despite thousands invested in suspension mods and better tires.

So both are great choices, just depends what you plan to use it for and how much power you have. My comments are only directed for street car use.

I know many will disagree, this is just one old man's opinion.

 

Actually I think you have a very good point. The power level of the vehicle is often forgotten in conversations regarding gearing. When you're pushing over 500 rwtq less aggressive gearing may be more helpful in putting it all power to the ground. It's a bit pointless to have all that torque and not be able to use all of it even on a dry surface in warm weather.

 

Yep, just look at the long gearing in the gt500.

 

100% agree! Gearing it to the moon to make up for being underpowered is great until you have some power, then the situation is less than ideal Great way to summarize what I was sorta rambling about earlier.