3.55 or 3.73

OxMox · Oct 26, 2005

Ok, I need some help with this. I got a '04 Mach and I want to do gears... BUT, I don't want 4.10's. I had 4.10's on my V6 and they were cool & fun and all that, but a little too much work. Maybe they sucked cause they were on a 6, but I still would rather get something a little smaller. I was thinking of 3.55 or 3.73 but I don't want to lose to much of the bottom end torque.

This is some of the modds I plan on doing (to help you guys out a little)

Camms
Headers LT's or Mid-length (already have o/r x-pipe & cat-back)
Intake
90mm MAF
T-body
Pulleys
Ported heads
...Pretty much keeping it N/A

I'm stuck with 3.55's but any help on decideing would be appreciated

BennyBlown2v · Oct 26, 2005

Your Mach already has 3.55's.

hotrodnut · Oct 26, 2005

The Mach1 has 3.55's from the factory. I would not go more than 3.73's without upgrading to 31 spline axles and posi because the torque mutiplcation goes up too much with any more gear than that.

I can tell you with the 3.73's over the 3.55's in my Mach1 it pulls a lot stronger up top in 3rd and 4th. I've had 4.30's without the upgraded 31 spline parts and then 4.56's with all good stuff but for me I'm really happy with the 3.73's overall.

RandyStinchcomb · Oct 26, 2005

if your a serious racer, 4.30's or 4.56's at best on a N/A DOHC, if your going wth a power adder later on then I'd do 3.73's. remember this is a high-reving 4V not a V6, "don't fear the gear"

OxMox · Oct 26, 2005

I didn't know the Mach had 3.55's stock. I thought it was 3.20 somthing...

Ok, then how does everyone feel about the 3.73's? And how would they mix up with an Auburn Ected differential?

helty · Oct 26, 2005

since you already have 3.55s i dont thinkg 3.73s would be a big step up in preformance. on a 2V 3.73s are a nice step up, but with the mach i would go 3.90s at least. (4.10s, 4.10s....smile)

dont fear the gear man.

OxMox · Oct 26, 2005

helty said:
since you already have 3.55s i dont thinkg 3.73s would be a big step up in preformance. on a 2V 3.73s are a nice step up, but with the mach i would go 3.90s at least. (4.10s, 4.10s....smile)

dont fear the gear man.

When I had the 4.10's on the V6 I had a better start off the line, but I had no top end and very little mid-range power! It felt like it killed everything, so that's what i'm worried about... I don't want to put them in the mach and loose everything up top and have very little mid-range to work with

tomustang · Oct 26, 2005

worked v6 said:
I didn't know the Mach had 3.55's stock. I thought it was 3.20 somthing...

Ok, then how does everyone feel about the 3.73's? And how would they mix up with an Auburn Ected differential?

You have an extra 1000RPMS over a GT, those 4:10's on a 4V will act like 3:73's in a GT.

Get the 4:10's

RandyStinchcomb · Oct 26, 2005

worked v6 said:
When I had the 4.10's on the V6 I had a better start off the line, but I had no top end and very little mid-range power! It felt like it killed everything, so that's what i'm worried about... I don't want to put them in the mach and loose everything up top and have very little mid-range to work with

your not going to loose and mid-range and anything up-top wth a DOHC

OxMox · Oct 26, 2005

RandyStinchcomb said:
your not going to loose and mid-range and anything up-top wth a DOHC

Ok, I was just wondering. Cause if it won't make any difference than just giving me better launch off the line than I might not bother. The 4.10's didn't do anything from a roll, and very little when I was in traffic and it felt slower than before I installed them. I don't want to get them if all there going to do is rev my engine and not get me anywhere quicker... I'll look into them and see how other people with them on a 4v like'em and see if it actually made a difference

tomustang · Oct 26, 2005

worked v6 said:
Ok, I was just wondering. Cause if it won't make any difference than just giving me better launch off the line than I might not bother. The 4.10's didn't do anything from a roll, and very little when I was in traffic and it felt slower than before I installed them. I don't want to get them if all there going to do is rev my engine and not get me anywhere quicker... I'll look into them and see how other people with them on a 4v like'em and see if it actually made a difference

4.10's will make you **** a brick compared to when you had a set in the v6

tradde · Oct 26, 2005

Go with the 4.10s. You will not regret it.

todd4566 · Oct 26, 2005

If your going to spend the money on a gear change, go with at least 4.10, but on a 5spd I'd even push 4.30 on the 32v. Going with something like 3.73 is a waste, unless the labor is free or your getting a ridiculous deal.

hotrodnut said:
The Mach1 has 3.55's from the factory. I would not go more than 3.73's without upgrading to 31 spline axles and posi because the torque mutiplcation goes up too much with any more gear than that.

Sure it's great to upgrade to 31 splines, but it's not madatory. There are numerous people over on the Mach 1 Registry who have switched to 4.30 & are still running an otherwise factory rear-end with no issues.

OxMox · Oct 26, 2005

todd4566 said:
If your going to spend the money on a gear change, go with at least 4.10, but on a 5spd I'd even push 4.30 on the 32v. Going with something like 3.73 is a waste, unless the labor is free or your getting a ridiculous deal.

Sure it's great to upgrade to 31 splines, but it's not madatory. There are numerous people over on the Mach 1 Registry who have switched to 4.30 & are still running an otherwise factory rear-end with no issues.

I asked one of my friends who has 4.10's on a cobra and he likes them alot... says it spends less time reving up to get into the power band than before and he says if he lost any power he can't really tell.

What's the difference in the 31 spline than the 28?

todd4566 · Oct 26, 2005

worked v6 said:
What's the difference in the 31 spline than the 28?

Strength of the rear axles. The more power & gear you added to your car, the more abuse the splines take. Your very unlikely to have any issues on street tires, but if you decide to slap on drag radials, that's when the real carnage begins.

streetstang03 · Oct 26, 2005

niether.

4.10s or 4.30s. you wont feel much of a difference w/ 3.73s.

Give Me TP · Oct 26, 2005

I am using 4.10s in my daily driver '03 Mach 1 and have absolutely no regrets.

BLUE03GT · Oct 26, 2005

no brainer.... Motive 3.90's

Jackie Chan · Oct 26, 2005

BLUE03GT said:
no brainer.... Motive 3.90's

have you driven a car with 3.55, 3.73, 4.30s and so on? if not please dont tell him that is the best gear. escpecially since he is in a 4v

i would personally go 4.30 without hesitation if I just planned on street use....if i was going to race with any frequency 4.56's and slicks

if you dont want any reall gears in there, i have no idea why you would even bother with headers or ported heads

03ghoststang · Oct 26, 2005

4.10's DONT FEAR THE GEAR!!!!!

3.55 or 3.73

OxMox

turkeysammichesonhisface

BennyBlown2v

New Member

hotrodnut

Member

RandyStinchcomb

New Member

OxMox

turkeysammichesonhisface

helty

some Ukrainian's enjoying a handjob via my credit

OxMox

turkeysammichesonhisface

tomustang

Psychotic Member

RandyStinchcomb

New Member

OxMox

turkeysammichesonhisface

tomustang

Psychotic Member

tradde

New Member

todd4566

OxMox

turkeysammichesonhisface

todd4566

streetstang03

unModerator

Give Me TP

Member

BLUE03GT

New Member

Jackie Chan

I didn't read this.

03ghoststang

Well-Known Member

Similar threads

3.55 or 3.73

turkeysammichesonhisface

New Member

Member

New Member

turkeysammichesonhisface

some Ukrainian's enjoying a handjob via my credit

turkeysammichesonhisface

Psychotic Member

New Member

turkeysammichesonhisface

Psychotic Member

New Member

turkeysammichesonhisface

unModerator

Member

New Member

I didn't read this.

Well-Known Member

Similar threads

Privacy & Transparency

Privacy & Transparency