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Old 05-31-2014, 01:14 PM   #1
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373's

My mustang guy has Grimace all in pieces today. Transmission, engine, everything is out. He said I have 373 gears. Ok. I know what they are. But what are the benefits of these? I guess now I know why I'm sitting at 3500 rpms doing 100mph.
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Old 05-31-2014, 01:38 PM   #2
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373's give you about 2 MPG worse than stock gears, but they have you accelerate much faster.

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Old 05-31-2014, 01:49 PM   #3
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Don't go 100mph and that would help
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Old 05-31-2014, 01:56 PM   #4
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Idk what I'm turning at 100. I've gone 100, but didn't glance at the rpm's

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Old 05-31-2014, 01:57 PM   #5
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Idk what I'm turning at 100. I've gone 100, but didn't glance at the rpm's

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Yea probably a good idea to keep your eyes on the race track when going that fast.
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Old 05-31-2014, 04:24 PM   #6
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Yea probably a good idea to keep your eyes on the race track when going that fast.

Because 100mph is so fast...
I do that driving home from work lol
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Old 05-31-2014, 05:01 PM   #7
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Because 100mph is so fast...
I do that driving home from work lol

Speeding and street racing talk is not allowed on this forum. I would recommend you slow yourself down there is no need to go that fast on the regular like that. For your safety and others around you slow down.
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Old 05-31-2014, 06:00 PM   #8
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Speeding and street racing talk is not allowed on this forum. I would recommend you slow yourself down there is no need to go that fast on the regular like that. For your safety and others around you slow down.

You must never have been to Southern California. When there is no stop and go, everybody is driving hella fast. 80/90 is not out of the ordinary on a normal trip
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Old 05-31-2014, 06:07 PM   #9
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You must never have been to Southern California. When there is no stop and go, everybody is driving hella fast. 80/90 is not out of the ordinary on a normal trip

If everyone was jumping off a bridge would you?..... lol
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Old 05-31-2014, 06:42 PM   #10
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3.73s can actually increase your mileage if you stay off the highway. Allows you to get up to speed "easier".

As for going 100mph, we've all done the blasts every now and then but routinely every day... that is going to get you or someone else killed. I mean think about it, you just had a balljoint completely fail. Can you imagine if it had decided to go during one of those 100mph runs?

Ok off soapbox. IMHO, 3.73s are a pointless gear. You don't get the hwy mileage of stock gears and you don't accelerate as well as 4.10s. A 2V, especially a NPI needs all the help it can get on the bottom end. I only have 3.73s because the previous owner of my car put them in. Now, especially with the .62 overdrive I have with the new trans, it will be 4.10s, maybe even 4.30s. Or I'll put the 3.08s in for DD purposes since I don't track this car at all.
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Old 05-31-2014, 07:45 PM   #11
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You must never have been to Southern California. When there is no stop and go, everybody is driving hella fast. 80/90 is not out of the ordinary on a normal trip

I just moved to Southern California and I gotta say I hate the drivers here. Every time I'm on the freeway, my goal is to not die. The majority of people drive like a**holes
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Old 05-31-2014, 08:23 PM   #12
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Oh, NJ Parkway left lane is 85+ at all times during the day in the left lane. Still doesn't mean one can't do 65-70 in one of the right lanes. ******bags in 7 series BMWs and Mercedes are always doing 100 tho it seems like.
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Old 05-31-2014, 10:48 PM   #13
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Yeah I left PA thinking I was getting away from the NJ drivers...not sure which is worse now, CA or NJ
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Old 05-31-2014, 10:51 PM   #14
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I've driven in LA traffic too. It's pretty much the same just on different coasts.
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Old 05-31-2014, 11:51 PM   #15
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120 km/h = $95 and 3 points off your licence
130 km/h = $220 and 4 points off your licence
140 km/h = $295 and 4 points off your licence

and considering 100 mph = 160 km/hr
I would loose my licence and my car would be crushed for
"stunt driving"

of course I have went much quicker then this and I don't know about you guys but around 140 km/hr or 90 mph is where my car starts to feel a bit unstable and I can really feel the wind pushing on the side of the car!...

Maybe in a more modern car, 100mph feels like nothing but I am sure in your 96 as well as my 00 100MPH on the street is hauling some serious *** and doesn't feel especially uhh safe in these cars.. just my opinion from personal experience.
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Old 06-01-2014, 12:14 AM   #16
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115 in my v6 felt very unsafe... I'd never go that fast again lol. I couldn't imagine the 150 our cars show on the speedometer. Our cars are too light for it or somethin lol
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Old 06-01-2014, 12:26 AM   #17
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If everyone was jumping off a bridge would you?..... lol

I might if it looked fun

It's not about whether or not everybody is doing it, it's about following the flow of traffic that moves fast here. Follow the 65 mph limit and most of the time you're an accident waiting to happen
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Old 06-02-2014, 10:27 AM   #18
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Gee wiz you guys. I was just making a comment about how the rpms are just higher with the 373's. They came already installed on the car. I was just debating on whether to change them while Grimace is all in pieces or if it was just more trouble than it's worth.
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Old 06-02-2014, 10:32 AM   #19
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Gee wiz you guys. I was just making a comment about how the rpms are just higher with the 373's. They came already installed on the car. I was just debating on whether to change them while Grimace is all in pieces or if it was just more trouble than it's worth.

Personally I would kill for 3.73 cause my 2.73 are just not cutting it. If you really don't want them I will trade you my 2.73 lol But honestly like said before for your city driving those gears might help you but highway it might only effect it by a couple of Mpgs. It all depends on how you drive the car
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Old 06-02-2014, 10:37 AM   #20
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I spin 3k rpm at 80mph...... On my 2 hour drive from school to home, or vice Versa I still drive 80mph. Still get 17+mpg
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Old 06-02-2014, 10:49 AM   #21
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I haven't had a gas issue. Grimace can typically get anywhere from 18-25 mpg depending on how I drive him. I drive 26 miles to work and the same route home and a full tank of gas will last me all week as long as I don't go anywhere else. I think I fill up twice a week including the weekends. Speaking of fuel though. I NEVER use 87. Always 89. Is that bad for it? I've just always been told to use 89.
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Old 06-02-2014, 10:54 AM   #22
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Yes run the best gas you can, I have been running premium fuel in my car since I got it
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Old 06-02-2014, 10:57 AM   #23
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You can use whatever gas you want. 87 is fine. I run 91 since I'm tuned for that and can't get 93 here. If you aren't tuned for a better octane your really just lightening your wallet. Depending on how I drive I get anywhere between 11-22mpg, 22 mpg is straight highway at the right rpm, 11 mpg was literally flooring it from every light.

Just remember..... A redline a day keeps the mechanic away.
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Old 06-02-2014, 12:34 PM   #24
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With the stock tune you are just wasting money running anything but 87.

And again, with the gears, depends on your driving habits. From what you describe the 3.73s are fine for you right now and it really doesn't matter if the car is apart or not when doing gears. The DS bolts and rear housing are very accessible.

If you want, you can google "RPM calculator" and the first result will be a page that lets you put in your tire size, final drive ratio and speed and get the RPM you will be at if you wanted to see what you'd get with different gears.

Final drive on your T-45 is .68, stock tire size is 25.7" and there you go. Its the calculator at the bottom of the page btw, not the top.

The biggest issue with mustang 5 speeds is the drop off between 4th and OD which is why they have 6 speeds now (fuel efficiency is the main reason). Give you that extra gear between 1.00 and final OD. And this is my biggest issue right now on my car with the .62 overdrive. I can go 2400-2500rpm in 4th at around 50-55mph on backroads but when I shift it goes right to 1500 lol. Need 4.10s or drop down to 3.55s or lower to get back into a "sweet spot". And I'm not trying to hijack, I'm just trying to illustrate what can happen if you don't do research and just throw any old set of gears in there.

Edit: Although I did look up my crusing RPM with the .62 overdrive and 3.08s at 2100 rpm lol.
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Old 06-02-2014, 01:28 PM   #25
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With the stock tune you are just wasting money running anything but 87.

And again, with the gears, depends on your driving habits. From what you describe the 3.73s are fine for you right now and it really doesn't matter if the car is apart or not when doing gears. The DS bolts and rear housing are very accessible.

If you want, you can google "RPM calculator" and the first result will be a page that lets you put in your tire size, final drive ratio and speed and get the RPM you will be at if you wanted to see what you'd get with different gears.

Final drive on your T-45 is .68, stock tire size is 25.7" and there you go. Its the calculator at the bottom of the page btw, not the top.

The biggest issue with mustang 5 speeds is the drop off between 4th and OD which is why they have 6 speeds now (fuel efficiency is the main reason). Give you that extra gear between 1.00 and final OD. And this is my biggest issue right now on my car with the .62 overdrive. I can go 2400-2500rpm in 4th at around 50-55mph on backroads but when I shift it goes right to 1500 lol. Need 4.10s or drop down to 3.55s or lower to get back into a "sweet spot". And I'm not trying to hijack, I'm just trying to illustrate what can happen if you don't do research and just throw any old set of gears in there.

Edit: Although I did look up my crusing RPM with the .62 overdrive and 3.08s at 2100 rpm lol.

You officially lost me. That's too many numbers. Maybe I should've read that after work lol. Because as of right now, my brain is about to explode. (My computer at work crashed and I've been staring at codes since 8am)
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