Differance Between 355 And 373 Gears - Forums at Modded Mustangs
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post #1 of 34 Old December 13th, 2007, 11:52 AM Thread Starter
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Differance Between 355 And 373 Gears

i have seen post for the differance between 373 and 410. but what is the differance between 355 and 373.
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post #2 of 34 Old December 13th, 2007, 11:55 AM
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about 13% of rpm at any given speed. I have 3.55's... they're about the perfect gear for my purposes. If you're using a 4.6L then a set of 3.73's is great. If you have a 5.4 swap like me, the 3.73's are just too much.
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post #3 of 34 Old December 13th, 2007, 12:53 PM
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Originally Posted by r3dn3ck View Post
about 13% of rpm at any given speed. I have 3.55's... they're about the perfect gear for my purposes. If you're using a 4.6L then a set of 3.73's is great. If you have a 5.4 swap like me, the 3.73's are just too much.
wrong, there is about a 5% difference in rpm. I would def go 3.73s, unless you plan on staying N/A, in which case you might wanna consider 4.10s
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post #4 of 34 Old December 13th, 2007, 01:37 PM
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imho there is no point in ripping apart rear end if you going to go from 3.27 to 3.55

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post #5 of 34 Old December 13th, 2007, 01:50 PM
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imho there is no point in ripping apart rear end if you going to go from 3.27 to 3.55
+1

my friend was gonna put 3.27's in his 98 until i smacked him upside the head....

turns out it was a slap well worth it, he had 3.27's already


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post #6 of 34 Old December 13th, 2007, 02:04 PM
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3.73 is definately good gear ratio. i put mine in not too long ago and i love them, never drove a car with 4.10's tho
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post #7 of 34 Old December 13th, 2007, 03:40 PM
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love my 4.10s! when i get my supercharger its prolly gonna be to much for street with street tires....slicks + 4.10s + supercharger...works good I hear

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post #8 of 34 Old December 13th, 2007, 03:47 PM
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love my 4.10s! when i get my supercharger it prolly gonna be to much for street....slicks + 4.10s + supercharger...works good I hear
I have a friend who has 4.10s with a whipple at 10 psi... he spins all the way through 2nd on the street. Yeah, I would say they're a little much

The 4.10s will be good on the track as long as you're not running out of gear. My friend hits his rev limiter at 112 mph in 4th. So as long as you're trapping less then that, you'll be ok (you really don't want to have to make a reach for 5th at the track).
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post #9 of 34 Old December 13th, 2007, 03:51 PM
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which gears are better for gas milage though?

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post #10 of 34 Old December 13th, 2007, 03:54 PM Thread Starter
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what is the differance in mpg.
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post #11 of 34 Old December 13th, 2007, 04:13 PM
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which gears are better for gas milage though?
http://www.moddedmustangs.com/forums...-73-4-10s.html
If there is any at all, it won't be more then .5 mpg

I think the 4.10s will do better in town though.
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post #12 of 34 Old December 13th, 2007, 11:55 PM
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wrong, there is about a 5% difference in rpm. I would def go 3.73s, unless you plan on staying N/A, in which case you might wanna consider 4.10s
if you're gunna call me out on being off by a few % on a rough estimate, at least be correct with your own.

8% difference.
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post #13 of 34 Old December 14th, 2007, 12:13 AM
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if your staying n/a go 4.10s, if your going blown or fear the gear go 3.73s

i like my 4.10s and mines a daily summer car

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post #14 of 34 Old December 14th, 2007, 12:18 AM
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the easy way for the new guys to see it is this way

3.27's= 3 and 1/4 turns
3.55's= 3 and 1/2 turns-1/4 increase
3.73's= 3 and 3/4 turns-1/2 increase
4.10's= 4 and 0/4 turns-3/4 increase

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post #15 of 34 Old December 14th, 2007, 12:23 AM
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imho there is no point in ripping apart rear end if you going to go from 3.27 to 3.55
Really? Based on what? I am giving serious thought to installing 3.55s, I'm running a P1SC with 9 lbs, of boost and plan on making the 500 mile run up the 101 to the Monterey Historics. There are numerous Ferraris, Porsches, Lambos, etc. and others that make this run and we will run speeds of 140 plus> I plan on keeping up with them...

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post #16 of 34 Old December 14th, 2007, 12:31 AM
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well if your blown 3.55s are an option, but most do 3.73s

to me its just not worth ripping apart rear end just to do that small of a change. if your upgrading rear already then sure. but just to do 3.55 gears, i see it as a waste of money unless you can do it yourself

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post #17 of 34 Old December 14th, 2007, 12:41 AM
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Originally Posted by gsjohnson View Post
Really? Based on what? I am giving serious thought to installing 3.55s, I'm running a P1SC with 9 lbs, of boost and plan on making the 500 mile run up the 101 to the Monterey Historics. There are numerous Ferraris, Porsches, Lambos, etc. and others that make this run and we will run speeds of 140 plus> I plan on keeping up with them...
u can do a lil over 150 with 3.73's and be in a better power range over 100

besides who in the hell roll races past 140? unless they run 10's

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post #18 of 34 Old December 14th, 2007, 01:23 AM
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u can do a lil over 150 with 3.73's and be in a better power range over 100

besides who in the hell roll races past 140? unless they run 10's
You on Crack Kenny?


Yes You CAN Do a little over 150 But You cannot Cruise There.

With 3.73's You have no power after 125.

With an Auto You lose Your power @ 115.

In an Auto With 3.73's You reach 154mph @5400 Rpm's


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post #19 of 34 Old December 14th, 2007, 01:26 AM
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You on Crack Kenny?


Yes You CAN Do a little over 150 But You cannot Cruise There.

With 3.73's You have no power after 125.

With an Auto You lose Your power @ 115.

In an Auto With 3.73's You reach 154mph @5400 Rpm's
+1


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post #20 of 34 Old December 14th, 2007, 01:31 AM
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Hmmmmm

I want a Cobra, So much Better @120+ speeds!
Gotta love a 6 speed With 3.55's!


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Last edited by Smoothgrandmama; December 14th, 2007 at 01:34 AM.
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