depends on tire size, assuming 225/55/16, @ 25mph, 3,000rpms(2.73), 3360(3.08) or 3575(3.27)

check the door tag axle code

its easier to accelerate for the engine, the torque is multiplied greater, therefore its easier for 300ft-lbs x 3.35 x 3.73 to move a car then 300ft-lbs x 3.35 x 2.73(simplified explanation)

 

Most automatics have 2.73s and most manuals have 3.08s.

 

I had 3.73s in my 95 stang alittle to high of a gear for my taste, but than again i'm not going to the drags or nothing like that. So I bought some 3.55s i'm putting them in springtime.

 

I bought them new from here.Everything you need for install kit. Also has in 3.73s and 4.10s if you like.........

http://cgi.ebay.com/ebaymotors/Musta...Q5fAccessories

 

Well this is very interesting...

now the question is 3.73 or 3.55's

which would be best for a dd? city driving mainly,

im never at the track

 

False, at least for foxes. The majority had 2.73's regardless of manual or auto.

I went from 2.73 to 3.55's and love them, you still have a pretty good first gear and plenty of go on the highway. I laughed for the first 2 miles I drove it. HUGE difference. 5th gear pulls like 3rd gear did and 1, 2, 3 all pull real hard. As far as the mileage goes, difference between the two would be negligable.

 

ive got a 4cyl trans and 3.27 gears and i can only get about 25 or 30 mph out of first gear

 

Well the higher the gear the more shifting your going to do?Do you like to shift alot?than 3.73s if not 3.55 or lower gears....

 

OK, you drive a mustang and you're worried about gas mileage? You're kidding right?

 

again depending on tire size and I believe the gearing is steeper in the 4cyl trans

2.73s were standard on coupes and hatches, 3.08s were optional, and 3.27 was on verts