Anyone Upgrade from 2.73's to 3.27/3.55's Instead of 3.73's? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 17 Old 05-12-2002, 10:12 AM Thread Starter
BMS
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Anyone Upgrade from 2.73's to 3.27/3.55's Instead of 3.73's?

Gears are on my list soon. Still running stock 2.73's. But for some reason, I just can't seem to go with everyone's suggestions to put 3.73's in there as I do lots of highway driving and I have experimented with rpm's at those speeds (ie, reading where my stock tach is at while running 80, rev the tach up to the corresponding rpm's if I had a set of gears). I am really eyeing 3.55's and I really am not looking for the most out of the gears. I still want some sort of 1st gear as I do a lot of stop and go driving and stay in 1st a lot in heavy traffic. I also love driving my car on the highway and sitting in 5th at 85 mph and only turning 2K rpm. So I am looking for a mild but solid improvement over stock. Anyone UPGRADE FROM THE 2.73's either the 3.27's or 3.55's and satisfied? I'd like to hear from people who can make the comparison. Thanks in advance.


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post #2 of 17 Old 05-12-2002, 10:37 AM
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i have a svo blown/lame cruiser not an all out bust parts car. 327 gears make a nice cruise around quiet highway car. with the 373s, that feeling is gone. for me 355s are just nice. but you will not keep up with the hard core guys. bobn

ps i purchased my own brg press and a dial indicator, a large impact for the crush nut and tried all the ratios for myself. i also played with the pinion spacer to find out where the gears ran quiet at. (must be bored, huh?)


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post #3 of 17 Old 05-12-2002, 10:45 AM
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My 5.0 doesn't like revs like your 4.6, but I have 3.73's and they are fine. Before my car was SC'ed I used it on the highway daily with the 3.73's. Heck it still gets over 20 MPG on the highway. The revs at 70 MPH in 5th are like 2200, which is just fine. IMHO, if you don't get at least 3.73's then save your $$-do some other mod.
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post #4 of 17 Old 05-12-2002, 12:37 PM
 
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Yes, I been thru that same route!

I tried them all. I started with 2.73's and went to 3.55's before installing a p-dyne SC on my '97. I'm like you and lean toward the conservative side for my gearing. They worked fine with that SC but about a year later I got tired of the problems from the POS p-dyne SC and swapped it out for an SVO SC. I decided at that time that the extra low end torque from the roots blower would probably work fine with even lower (numerically) gears. I had a set of 3.27's installed. I picked up almost 1 mpg(highway) after dropping to the 3.27's. I think they work great for my application. I would think either set would work great for you as well. I see in your sig that you have done the headswap. I would suggest you find somebody with a 99 up car that has stock gears and ask them to let you take it for a drive. That should give you a pretty close representation of what your car would feel like with those gears.
If your worried about not being able to tell a difference between 2.73's and 3.27's, DON'T! You'll definitely be able to tell a difference. I had a 93 5.0 that I went from 2.73's to 3.07's(they were freebies). I was told by several people that I wouldn't even be able to tell a difference. B.S.!!! I could tell a big difference even with that small change. You drive your car enough and small differences are very apparent
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post #5 of 17 Old 05-12-2002, 01:20 PM
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Gear upgrade

This isn't a modular story. I have an '85 GT that came with 2.73's. I took them out and went with 3.73's. I didn't like the ratio, RPM's too high for a road car. Pulled them out and went with 3.45's--PERFECT!

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post #6 of 17 Old 05-12-2002, 01:42 PM
 
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Anyone who remembers me from the old days when I first signed on the forum knows I used to fear the gear. I have sense realized the error of my ways. I had a '96 GT 5 years ago and went from 2.73's to 3.27's. I deem it a mistake. Just as I consider putting 3.73's in my Cobra a mistake. For N/A applications 3.27 isn't enough gear for that car. Even for a daily driver that sees a lot of highway time. 3.55 minimum.
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post #7 of 17 Old 05-12-2002, 06:07 PM
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Re: Anyone Upgrade from 2.73's to 3.27/3.55's Instead of 3.73's?

Quote:
Originally posted by BMS
Gears are on my list soon. Still running stock 2.73's. But for some reason, I just can't seem to go with everyone's suggestions to put 3.73's in there as I do lots of highway driving and I have experimented with rpm's at those speeds (ie, reading where my stock tach is at while running 80, rev the tach up to the corresponding rpm's if I had a set of gears). I am really eyeing 3.55's and I really am not looking for the most out of the gears. I still want some sort of 1st gear as I do a lot of stop and go driving and stay in 1st a lot in heavy traffic. I also love driving my car on the highway and sitting in 5th at 85 mph and only turning 2K rpm. So I am looking for a mild but solid improvement over stock. Anyone UPGRADE FROM THE 2.73's either the 3.27's or 3.55's and satisfied? I'd like to hear from people who can make the comparison. Thanks in advance.
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post #8 of 17 Old 05-12-2002, 06:47 PM
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I went to 3.55s from 2.73. Works great! At the ime I was driving a lot on the highway. I got about 23 with the air on. With the 2.73 I got a bit higher.. No big deal. I am into second before I get across the intersection. works great on the street. The hard core guys will say 3.73 or 4.11 but I use the car to go everywhere. Drive is first priority racing is second for me.
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post #9 of 17 Old 05-12-2002, 09:59 PM Thread Starter
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Thanks for the responses guys. I only expected one or two! Not sure which one of you said it but, I'm just pretty conservative. I would like to take advantage of a set of gears but I want to keep the revs down when I cruise. I LIKE 5th gear to be OD. However, I don't want to have to shift to 3rd from 5th just to get it in the powerband now that I have one!

3.55's are almost a winner. Any others?

Brian
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post #10 of 17 Old 05-12-2002, 10:07 PM
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I spent weeks trying to decide which gears to fit. Finally decided on 3.73s and have never regretted it. On the highway, they are plenty tame but you can still pick up well in 5th. My original 2.73 gave a nice pull between 80 and 120 in 4th. They were pretty useless in 5th. I drive on the highway alot (after all, I do have 187,000 miles on my car) and have never wished I had gotten lower gears. I put the 3.73s on when I had 18,000 miles, did not put the blower on till 107,000. Well, thats my vote for 3.73s.
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post #11 of 17 Old 05-13-2002, 09:25 AM
 
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i have a 2000 GT, and i thought the modulars had 3.27 gears as stock??!!

What years had the 2.73s??? all stock stangs???
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post #12 of 17 Old 05-13-2002, 10:03 AM
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Quote:
Originally posted by DEEPstang
i have a 2000 GT, and i thought the modulars had 3.27 gears as stock??!!

What years had the 2.73s??? all stock stangs???
My 97GT had 3.27 I upgraded to 3.73

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post #13 of 17 Old 05-13-2002, 10:27 AM
 
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If I'm not mistaken, 96-98 manuals came with 2.73 stock and auto's with 3.08 stock. 3.27 was the option on both. I upgrade from 3.08 to 4.10's and while there was a slight drop in mileage, I thought it was the perfect highway gear. At 80mph, I think I was turning about 3100 rpm. This took the car out of the drone zone and into a nice quite hum. With the turbo, I went back to 3.27...back into the drone zone.
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post #14 of 17 Old 05-13-2002, 10:37 AM
 
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I love my 3.73s. I tried the Pro 5.0 made gears, no whine at all. The rpms are a little higher, but thats expected. I couldnt really tell a difference in 1st gear because it goes by pretty quick, but 2nd-5th pull real well. The gears by themselves knocked off 3 tenths in the quarter for me. The modular motors need a higher gear ratio for their reving abilities. I wouldnt go anything less than a 3.73 for 96-98GT, 4.10 for a 99+ GT, and a 4.30 for a 96+ Cobra.
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post #15 of 17 Old 05-13-2002, 10:41 AM
 
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I drive a lot of highway miles and I have 3.73 and love them... If you go with less then you will be sorry. You will only save about 130 rpms at 80 mph in 5th gear by going to 3.55 instead of 3.73. Don't make the mistake so many people have and go to low with your gears.

2.73 80 mph = 1925 rpms
3.27 80 mph = 2295 rpms
3.55 80 mph = 2495 rpms
3.73 80 mph = 2625 rpms
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post #16 of 17 Old 05-13-2002, 10:54 AM
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Brian...Sounds to me like you have it figured out, and you have been given some good advice here. However, I would like to add this: While 3.55's may be the right gear for you mathmatically, if you have a loud exhaust 3.55's may put 70 MPH cruising right in the middle of the "drone zone". For that reason, I would prefer either 3.27's or 3.73's if I were you. MHO

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post #17 of 17 Old 05-13-2002, 11:18 AM
 
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Jason (speedfreak) knows what is going on!!!

Listen to his advice, this is the best advice to listen to.

By the way, anyone know the extra parts that will be needed if not going with a FRPP gear set?
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