Would 6 Spd Trans Give Me Better Od W 3.73

90lxwhite · Dec 21, 2013

Would a 6th gear gimme much if an rpm drop when on the highway around 70-80?
http://www.latemodelrestoration.com/item/M7003M6266/Tremec-Magnum-T56-Transmission-M-7003-M6266

Grabbin' Asphalt · Dec 21, 2013

5spd DD needs a 3.55, so you trying to make it up with a 6th gear tranny for a 3.73??

A5literMan · Dec 21, 2013

Umm... Lot cheaper to change the gears. Just saying

90lxwhite · Dec 21, 2013

A5literMan said:
Umm... Lot cheaper to change the gears. Just saying

Ah I know.. But I'm only making 233 n 281 tq and I think the 3.73 gear is the only thing keeping me in the game. I'm afraid the 3.55 wouldn't be enough of an rpm drop to justify switch and 3.31 would lose too much low end. It'd not a dd but driving any kind of distance gets old(30-50 mi)

02 281 GT · Dec 21, 2013

I would say that it depends on the ratio of the overdrive gear.

90lxwhite · Dec 21, 2013

02 281 GT said:
I would say that it depends on the ratio of the overdrive gear.

Could you look at the link and lemme know what u think?
http://www.latemodelrestoration.com/item/M7003M6266/Tremec-Magnum-T56-Transmission-M-7003-M6266

02 281 GT · Dec 22, 2013

Well, according to this chart, pretty much all factory Ford 5.0 Mustangs equipped with a T-5 had a .68 5th gear ratio. The Tremec in the link has a 6th gear ratio of .63. That will be a slight improvement over .68 on the highway, however, it seems far too miniscule to make a noticable difference in the revs at those speeds.

The main advantage of upgrading to a 6-speed is that the extra gear helps spread the ratios around so that it's easier to keep the engine in the neighborhood of revs where it makes the most power.

Comparing the ratios of the stock 5.0 T-5 and the 6-speed in the link shows that you would have more useful 1st and 2nd gear ratios (2.66 vs 3.35 and 1.78 vs 1.99). The biggest advantage comes in road racing when you get to the .80 fifth gear that helps fill the gap between the 1.00 4th and .63 6th gears.

In the end, you wouldn't really gain much if your main objective is to have fewer revs on the highway.

stykthyn · Dec 22, 2013

you looking for gas mileage? Reducing rotational mass may be your best bet to save gas and make your car quicker.

revhead347 · Dec 22, 2013

If you want a 6 speed look for a T56 with a .50 sixth gear. That will help more. It's still going to cost you about 4k to get it in the car. There are cheaper ways to make it better.

Kurt

90lxwhite · Dec 22, 2013

stykthyn said:
you looking for gas mileage? Reducing rotational mass may be your best bet to save gas and make your car quicker.

It's not so much the gas mileage but the whaaaa and the constant pulling in 5tb on the hwy that gets old. Y'all know of anyone who ran a 3.31 behind a t5?

A5literMan · Dec 22, 2013

I don't understand your dilemma?! You just don't like the rpms you're pulling at highway speeds. So? What's the big deal? It's only turning what 2600rpm at 70 or so? Not trying to be a di ck but that's pretty minor. Through some 3.08-3.27 gears in it. Performance will be hurt but you'll have less highway rpms. I can't see throwing a 4k transmission at the problem. If you want the trans I say go for it! It's badass and will support any further power you may make in the future. But just to do it because of the hwy issue seems extreme

mikestang63 · Dec 22, 2013

I agree with the others. You want to spend 4k on a 6sp and to go from a 3.55 to 3.73, and you think it will be noticeable? For 2k, throw a Vortech on it and your problems are solved.

90lxwhite · Dec 22, 2013

mikestang63 said:
I agree with the others. You want to spend 4k on a 6sp and to go from a 3.55 to 3.73, and you think it will be noticeable? For 2k, throw a Vortech on it and your problems are solved.[ So you think a higher gear and a vortech huh? Kinda my original goal, well the vortech anyway. How much "umph" do you think I'd lose going from 3.73 to say 3.31 or 3.27 w out a power added? I originally had 2.73 in the azz so a 3.27 or 3.31's gotta be better than that right?

Grabbin' Asphalt · Dec 22, 2013

For a DD 5spd, highest i would go is a 3.55 regardless of power in my book, it's already boardering on a lot of whaaaaaaa on the hwy

RangerJoe · Dec 22, 2013

I thought you hated your 3.73's. Maybe I am confusing another user, but weren't you considering dropping down a gear size anyway? Like other's said, its a lot cheaper to do a gear swap.

Joe

JD1964 · Dec 22, 2013

I have 3.73's and I don't mind the rpm's at 70mph. For me, the whole package is a bit quieter at 25-2600rpm. When I drop down to 60mph and the engine is in the 20-2200rpm range, the engine makes that low tone droning resonating in the exhaust. Overall, to me that's more irritating than the higher rpm's. Definitely quieter at 2500 than 2000 in my car.

I agree that for 4k, I'd be looking into forced induction. Then you can drop your rear ratio without loosing acceleration performance.

Audiophile · Dec 22, 2013

I have 3.73s, and I don't really have a problem with turning more RPMs on the highway. If I remember correctly, I'm doing about 400-500 more at 70mph than I was with the stock 3.08s. I just made a drive across the country, and to my surprise, I got about 21 mpg. Seems halfway decent.

I'm no expert, but I can say I agree with the others. I just can't see spending $4K on a new transmission, that is, for this issue alone. However, to each his own! Good luck with whatever you decide to do!

Mustang5L5 · Dec 22, 2013

RangerJoe said:
I thought you hated your 3.73's. Maybe I am confusing another user, but weren't you considering dropping down a gear size anyway? Like other's said, its a lot cheaper to do a gear swap.

Joe

That would be me that's hates me 3.73s

Not about to swap to a t-56 though. I'd either drop to 3.55s or purchase an aftermarket t-5 5th hear with a taller ratio

RangerJoe · Dec 23, 2013

Mustang5L5 said:
That would be me that's hates me 3.73s

Not about to swap to a t-56 though. I'd either drop to 3.55s or purchase an aftermarket t-5 5th hear with a taller ratio

I think he posted on here recently stating that he had no first gear with his 3.73's. I could be wrong though, it sure wouldn't be the first time.

Joe

RangerJoe · Dec 23, 2013

http://www.stangnet.com/mustang-for...-rear-thinking-bout-ditching-the-3-73.872704/

Would 6 Spd Trans Give Me Better Od W 3.73

90lxwhite

I'm kind of a She-Man

Grabbin' Asphalt

A5literMan

At least it is lumpy...

90lxwhite

I'm kind of a She-Man

02 281 GT

Agreed...My wife has great Boobs

90lxwhite

I'm kind of a She-Man

02 281 GT

Agreed...My wife has great Boobs

stykthyn

I want to measure mine. It doesn't look that tall.

revhead347

Apparently my ex-husband made that mistake.

90lxwhite

I'm kind of a She-Man

A5literMan

At least it is lumpy...

mikestang63

90lxwhite

I'm kind of a She-Man

Grabbin' Asphalt

RangerJoe

I leave the horn on while driving

JD1964

there is enough sticking out to grab on to

Audiophile

Well-Known Member

Mustang5L5

That is…until I whipped out my Bissell

RangerJoe

I leave the horn on while driving

RangerJoe

I leave the horn on while driving

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