2.73 to 3.27 - TCCoA Forums
 
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post #1 of 12 (permalink) Old 04-17-2010, 04:17 AM Thread Starter
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2.73 to 3.27

I'm about to swap my gearset from 2.73 to a 3.27 in my 90 5-speed sc. Just curious how much of a differeance this will make. I want more off the line and not concerened too much with highway stuff. Should I have gone with the 3.55 or 3.73???

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post #2 of 12 (permalink) Old 04-17-2010, 04:35 AM
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You'll notice a nice difference going from 2.73 to 3.27 and yes, you should have gone to 3.73

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post #3 of 12 (permalink) Old 04-17-2010, 08:17 AM
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Isn't 3.73 a little much for a SC? I thought 3.55 was the way to go for the 6s.

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post #4 of 12 (permalink) Old 04-17-2010, 08:22 AM
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From what I've read on SCCOA with 3.73 you won't go anywhere with the M5R2.

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post #5 of 12 (permalink) Old 04-17-2010, 08:00 PM Thread Starter
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I read conflicting threads, that's why I asked. I heard the 3.27 was best for a 5-speed and the 3.55 was good for the auto. On the Super coupe performance website they reccomend that setup. I'm just thinking with that heavy of a car it would need more gear. Anybody know what the first gear ratio is in those 5speeds?

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post #6 of 12 (permalink) Old 04-17-2010, 08:29 PM
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The 89-93 SC have a different 1st and 2nd gear ratio than the 94/95's. The 3.27 makes 1st gear really short on the early style trans, but is not so bad on the late models. It runs great around town, quick .. just not as good on the freeway top end. I have an early model trans in my 94 SC with the stock 3.31 rear end .. I will be swapping it out for a 3.08 or 3.07 later on even though I have a 2.73 in storage.
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post #7 of 12 (permalink) Old 04-18-2010, 07:39 AM
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89-93 is 3.72
94/95 is 3.42

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post #8 of 12 (permalink) Old 04-18-2010, 09:11 AM Thread Starter
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Thanks for the info. I'll find out here next weekend when I do the swap. See if I can't get it's fat a$$ to get up a go a little quicker!! Its a good thing it makes torque like a diesel.

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post #9 of 12 (permalink) Old 04-18-2010, 10:33 AM
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I can't stand the 3.27s on the gen1 trans, sooner or later they will be replaced for the original 2.73s which has a mean second!

also i had 3.08s as well and I didn't notice much difference than the 2.73s other than my highway revs were higher, not worth it at all, ford did a pretty good job when they put the 2.73s behind the earlier style m5r2

stock 89-93 5spd supercoupe has a first gear ratio of 10.15 where as the stock 5.0 automatic birds got a first gear ratio of 7.392

so a stock 89-93 5spd sc has gearing equivalent to a 4.10 in an aod car.

putting a 3.73 in a 5spd gen1 sc is like putting a 5.8 rear end gear in an AOD thunderbird.

just comparing in different terms to make it more understandable

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post #10 of 12 (permalink) Old 04-20-2010, 11:56 PM Thread Starter
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Quote:
Originally Posted by decipha View Post
I can't stand the 3.27s on the gen1 trans, sooner or later they will be replaced for the original 2.73s which has a mean second!

also i had 3.08s as well and I didn't notice much difference than the 2.73s other than my highway revs were higher, not worth it at all, ford did a pretty good job when they put the 2.73s behind the earlier style m5r2

stock 89-93 5spd supercoupe has a first gear ratio of 10.15 where as the stock 5.0 automatic birds got a first gear ratio of 7.392

so a stock 89-93 5spd sc has gearing equivalent to a 4.10 in an aod car.

putting a 3.73 in a 5spd gen1 sc is like putting a 5.8 rear end gear in an AOD thunderbird.

just comparing in different terms to make it more understandable
So your sayin the 3.27 is too much?

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post #11 of 12 (permalink) Old 04-21-2010, 08:27 AM
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I like my 3.27s but @ some point im going to go 3.55. 3.73 is a bit much for 1st gear from what I hear that being said ime is a five point hoe

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post #12 of 12 (permalink) Old 04-21-2010, 11:28 AM
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Having gone through this myself I can tell you that 3:73 gears in a 5-speed is way too much gear. You will be shifting to second just going through a red light and will need another gear at highway speeds. I ran 3:55s after that and it was an improvement. Lots of fun but still a little much. I found the 3:27s were just about perfect. Good hard launches and still pretty good on the highway also. By the way, my car is a 91 SC.
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