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Old 01-22-2007, 07:39 PM   #1
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thinking of downsizing the gears

I have 3:73 gears and just feel like they are too low for my driving style thinking of getting 3:55's any suggestions or help would be greatly appreciated.
thanks
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Old 01-22-2007, 07:42 PM   #2
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Re: thinking of downsizing the gears

all depends what you wanna do for a setup honestly


BTW i have a set of 3.55 for sale brand new still in the box
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Old 01-22-2007, 07:45 PM   #3
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Re: thinking of downsizing the gears

how much and I really am not racing it but like to get on it every now and then and it just seems like you have to change the gears so fast I mean in 1st gear its like 25-30 and its around 4-5000 rpm's
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Old 01-22-2007, 08:23 PM   #4
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Re: thinking of downsizing the gears

with gears you should run to about 5400 RPMs before shifting (at least that's what I found with my 89)

dropping down to 3.55s won't make much of a difference on when you have to shift out of first, first is a close gear either way... as for highway RPMs dropping to 3.55s would drop your RPMs maybe by 100-200..

Just a thought
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Old 01-22-2007, 08:46 PM   #5
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Re: thinking of downsizing the gears

a budy of mine had a 93 and he told me that he had 3:55's in his and I seen him hit 55 in first but when I get mine in the higher rpm's it sounds the lifters or springs gets noisy I dont know what it is.
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Old 01-22-2007, 08:50 PM   #6
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Re: thinking of downsizing the gears

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Originally Posted by cowboy72 View Post
a budy of mine had a 93 and he told me that he had 3:55's in his and I seen him hit 55 in first but when I get mine in the higher rpm's it sounds the lifters or springs gets noisy I dont know what it is.
Did he have an automatic? or a 4 speed manual? an aftermarket trans? or maybe a 4 cylinder trans? 3.55s are not that drastic of a change from 3.73s. There's almost no way of hitting that speed in first in our cars ... my 92 is outta first by ~35-40 with 3.73s and a 6200 RPM shift point, my 89 was the same way with 3.55s @5400 RPM Heck I'm out of second by 65ish...

Something was different with his car

Don't ever rev your 5.0 that high, for the sake of your motor
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Old 01-22-2007, 08:55 PM   #7
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Re: thinking of downsizing the gears

My '91 GT with 2.73s would hit 60-65 in 2nd. There's no way you're gonna hit 55 in first with a T5... even if it is the taller-geared 1st versions.

That said, never fear the gear. Put some 4.10s in it.
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Old 01-22-2007, 08:59 PM   #8
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Re: thinking of downsizing the gears

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Originally Posted by bbunt302 View Post
My '91 GT with 2.73s would hit 60-65 in 2nd. There's no way you're gonna hit 55 in first with a T5... even if it is the taller-geared 1st versions.

That said, never fear the gear. Put some 4.10s in it.
He speaketh truth
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Old 01-22-2007, 09:38 PM   #9
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Re: thinking of downsizing the gears

i live by the saying "don't fear the gear" im swapping 3.73's to 4.10's because it isn't enough for me.
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Old 01-22-2007, 09:45 PM   #10
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Re: thinking of downsizing the gears

only reason the 92 is staying 3.73 is because I'm going boosted, and I don't want to shift 4th-5th on the 1/4
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Old 01-22-2007, 11:08 PM   #11
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Re: thinking of downsizing the gears

he bought it brand new back in 93.I seen the speedo show it now I dont know if he had already changed out the factory gears at the time and he dont remember either.So I dont know what to say on that.
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Old 01-22-2007, 11:12 PM   #12
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Re: thinking of downsizing the gears

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Did he have an automatic? or a 4 speed manual? an aftermarket trans? or maybe a 4 cylinder trans? 3.55s are not that drastic of a change from 3.73s. There's almost no way of hitting that speed in first in our cars ... my 92 is outta first by ~35-40 with 3.73s and a 6200 RPM shift point, my 89 was the same way with 3.55s @5400 RPM Heck I'm out of second by 65ish...

Something was different with his car

Don't ever rev your 5.0 that high, for the sake of your motor

so you hit 2nd at 35-40 at 6200 rpm damn I dont like taking mine past 5500
maybe I can check mine by that to make sure I do have 3:73 gears
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Old 01-23-2007, 06:02 AM   #13
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Re: thinking of downsizing the gears

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Originally Posted by cowboy72 View Post
so you hit 2nd at 35-40 at 6200 rpm damn I dont like taking mine past 5500
maybe I can check mine by that to make sure I do have 3:73 gears

don't attempt that... I've got a cam and upgraded springs/valvetrain... your car doesn't even make power up top (not knocking it) its a bottom end/mid range torque motor..

and my speedo is off by about 10 MPH when I go through the traps...
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Old 01-23-2007, 07:44 AM   #14
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Re: thinking of downsizing the gears

it depends on what your going to do with the car, if it will always be street driven and never see the track or a set of stickies then 355's will actually be the faster gear, as you can run a large tire with it, some good suspension on the street and have pretty good success with "hook"
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Old 01-23-2007, 08:05 AM   #15
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Re: thinking of downsizing the gears

3.73 vs 3.55 really isnt a huge jump or down size I wouldnt bother for just that little bit of a gear change.
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Old 01-23-2007, 08:06 AM   #16
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Re: thinking of downsizing the gears

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Originally Posted by SpectorV View Post
3.73 vs 3.55 really isnt a huge jump or down size I wouldnt bother for just that little bit of a gear change.
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Old 01-23-2007, 09:35 AM   #17
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Re: thinking of downsizing the gears

Honestly the motto ive been taught when it comes to fox cars is this

3.55 turbo
3.73 s/c
4.10 nitrous

if your intrested in the gears PM im sure we can work out a deal if you really want them
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Old 01-23-2007, 10:10 AM   #18
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Re: thinking of downsizing the gears

well I am not any of those. But if indeed you guys think that there is not going to be much of a difference in this I am not sure now
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Old 01-23-2007, 10:25 AM   #19
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Re: thinking of downsizing the gears

EXAMPLE as per MPH calculator -> guesstimated tire height 26"

5400 RPM, 3.35 : 1 first gear ratio 3.73:1 rear end ratio, MPH is 33.5 (so shift point in first gear? could possibly run it a little higher in first..)

5400 RPM 26" tire 3.35: 1 first gear ratio 3.55:1 final drive (rear end) ratio MPH is 35 at 5400 RPM

So in first gear from 3.73 to 3.55 you're running only 2 MPH higher at the same RPM in first gear...

second gear... 1.93:1 ratio MPH is 61 (at 5400 RPMs) with the 3.55s MPH is 58 with 3.73s...

That's not a huge difference, and IMO not worth messing with the rear if its otherwise solid...
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Old 01-23-2007, 10:30 AM   #20
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Re: thinking of downsizing the gears

point taken and I guess my tires are 26" they are 245/45/17 and if thats the case then yeah its not worth it.I just cant figure out how the hell my buddy did it and I watched the speedo for him while he changed the gears so the only thing I can think of was that he still had the factory gears in
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Old 01-23-2007, 04:05 PM   #21
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Re: thinking of downsizing the gears

ok after I ran the car it looks to appear as 30 @ 5000 rpm's and 50 @ 5000 rpm's is this correct now I did go to 17" rims but I do not know if it changed my speedo
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Old 01-27-2007, 03:49 PM   #22
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Re: thinking of downsizing the gears

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ok after I ran the car it looks to appear as 30 @ 5000 rpm's and 50 @ 5000 rpm's is this correct now I did go to 17" rims but I do not know if it changed my speedo
If you went from the stock P225/55ZR16 tires, the overall diameter of your new tire/rim combo should be the same, so your speedo is correct.
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Old 01-28-2007, 01:12 PM   #23
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Re: thinking of downsizing the gears

I would stick the 3.73 for now untill you really need it and put the money in your turbo upgrade if it was me.
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Old 02-14-2007, 01:38 PM   #24
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Re: thinking of downsizing the gears

+1... 3.73's arent bad... I like em actually. i dont know that i would go with 4.10's but i think the 3.73's for a near stock or bolt on car should be sufficient.
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