rear end gears - Ford Mustang Forum
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post #1 of 42 (permalink) Old 11-09-2015 Thread Starter
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rear end gears

Hi all

I'm thinking about changing the rear end gears in my 2012 gt 6speed manual vert stang. Please give me your infeed. thinking about 410s

Luke from Canada ehh

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post #2 of 42 (permalink) Old 11-09-2015
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too low for a street multi-purpose vehicle

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post #3 of 42 (permalink) Old 11-09-2015
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3.73 is as low as I would go with the new mustangs. If I had an 11+ GT I would go 3.55s. Although I love my 4.10s in my 01 GT.

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post #4 of 42 (permalink) Old 11-09-2015
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Originally Posted by JonR2006 View Post
3.73 is as low as I would go with the new mustangs. If I had an 11+ GT I would go 3.55s.
Agreed. I bought mine with 3.73s and they don't need to be any lower. First gear in the transmission is pretty low and would be nearly worthless with 4.10s.

What do you have in your car now? 3.55s would be ideal with 3.73s being the absolute lowest I'd go.
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post #5 of 42 (permalink) Old 11-10-2015
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What are you trying to achieve with shorter gearing?

Is there some road track that you run where you want to maintain higher RPM in some sections, without downshifting?

Or you want to shift earlier in the 1/4 mile?

Or if you are talking about better pick-up on the street; is there some situation where you can't just downshift?

From looking at the transmission ratios, 3.31 rear seems like the "perfect" set-up for a street car to me. This gives you a usable first gear and a fairly high sixth for highway cruising. In between you have one more gear than I have in my five speed so I can't figure out why there would not be an appropriate gear for just about every situation.
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post #6 of 42 (permalink) Old 11-10-2015
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Gonna second everybody here, good advice all around.

I got 3.73s and even with those, cruising on the streets can be annoying sometimes when there's some smartass with a slushbox tailgating me starting off from a street light. I'll get going and have to pause a moment to shift into second really soon after and they'll be right on me. Although when you want to go fast it definitely gives you enough to get up and go.

Also correct me if I'm wrong here, but if you want forced induction at some point in the future you actually want taller gears since you'll run through short ones way too quick.
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post #7 of 42 (permalink) Old 11-10-2015
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I was OK with the 3:73s when I had my MT82, although at times, 1st gear was a handful.

I did, however, switch to 4:10s once I did the Tremec XL Magnum.
The Tremec is geared so much taller than the MT82, I really had no choice at that point to make the switch.

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post #8 of 42 (permalink) Old 11-10-2015 Thread Starter
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not sure whats in there stock.
just want a little more low end pick up without giving up too much 6th low rpm
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post #9 of 42 (permalink) Old 11-10-2015
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3.55 is my official vote...
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Quote:
Originally Posted by 12bigredstang View Post
not sure whats in there stock.

just want a little more low end pick up without giving up too much 6th low rpm

3.55s will do the trick.
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Quote:
Originally Posted by 12bigredstang View Post
Hi all

I'm thinking about changing the rear end gears in my 2012 gt 6speed manual vert stang. Please give me your infeed. thinking about 410s

Luke from Canada ehh
91' GT 5 speed w/ 3.73s - The 3.73s are fun and the car pulls nicely and wears drag radials. But I wish I had 4.10s . The car is rarely driven so I would put up with any drivability issues.

07' GT Auto w/ 4.10s- Loved them. It was my daily driver with basic mods and tune at the time. Really fun and helped out immensely at stop lights. Did a lot of freeway driving with no issues.

12' GT 6Spd w/ 3.55s- basic mods w/ Tune- Car came from factory with the 3.55s. I thought I might want the 3.73s or 4.10s but as I add more mods I'm finding traction a big problem all the way through 2nd gear where lower gears would benefit most.

Getting ready to install my rear suspension mods so hopefully traction gets better soon.

2012 Mustang GT Grabber Blue 6spd (Current)
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410 gears

2011 gt track pack originally 331 rear gear 60mph around1700 rpm
switched to 410 rear and 60mph 2000-2100rpm
smokes tires very good SHORT 1st gear youll want to get better shifter

whiteline tranny rubber
barton shifter

good luck
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Factory 3.73's on my 14 GT/CS and they whined until around 6,000 miles then stopped. However, 3.73's in our cars tend to whine, and trust me, no amount of whine is worth the small amount of pull you might feel on the low end. I agree that 3.55's is the sweet spot for our 11-14 Stangs! With that said, I'd leave the gearing alone unless you have those nasty factory 2.73's.

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How do you find out what gears you have ?

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Im running 3.55 and love them. Anything more would be useless IMO


Lots of parts. Still slow
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