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Not going drag race. Might do some light track days but mainly street use.

I have some pending 19/20s coming.

Think 3.73 is a little tall for 99% street but 3.55 (like gen5) would be better.
 

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The original owner of my '06 put 3.73s in. They reminded me of driving my old Ford 1 ton. So tall that 1st is mostly useless. The 6th gear at 90 mph was 3000 rpm or so. When that set failed, I went with a wavetrac 3.55 and I'm very happy with it. Much better control under hard acceleration, and while I don't always use 1st gear, when I do it is useful up to about 35mph. These are stock tires and wheels.
 

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Well if you have 19's on a gen 2 with 3.73s is nearly the same as 3.55s on a 18" tire.

Edit (should have added ( I have 355/30/19) so 27.5" tall tire might go with the 345/35/19s next time but they are pretty tight.

If I were to do it again I'd probably go 3.55s but I'm always back and forth love the 3.73s
 

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I've driven a bunch of gts's with gears. Best was 333's followed by 355's. 373 was too steep imo
 

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The original owner of my '06 put 3.73s in. They reminded me of driving my old Ford 1 ton. So tall that 1st is mostly useless. The 6th gear at 90 mph was 3000 rpm or so. When that set failed, I went with a wavetrac 3.55 and I'm very happy with it. Much better control under hard acceleration, and while I don't always use 1st gear, when I do it is useful up to about 35mph. These are stock tires and wheels.
Assuming a stock tire size (345/30-19 in your '06), 3000 RPM in sixth gear with 3.73 gears would be 130 MPH.

2100 RPM would work out to roughly 90 MPH.
 

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For reference here, we will assume 345/30-19 (27.1" OD) and stock T56 gearing (2.66 first gear);

6000 RPM, 3.73, first gear tops out 49 MPH
6000 RPM, 3.55, first gear tops out at 51 MPH
6000RPM, 3.07, first gear tops out at 59 MPH

And cruising, sixth gear, 80 MPH;

3.73 gears - 1850 RPM
3.55 gears - 1760 RPM
3.07 gears - 1530 RPM
 

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Well if you have 19's on a gen 2 with 3.73s is nearly the same as 3.55s on a 18" tire.

If I were to do it again I'd probably go 3.55s but I'm always back and forth love the 3.73s
This^^^ did 3.73s for this exact reason on Gen 2 & about perfect for me.
 

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Look at your tire OD for guidance, but I'd go 3.73. 5/6 are so tall that you won't lose any drivability with such a minor difference in final drive.
One a Gen 1-2 with 25.5" tires, then the 3.31 or 3.55 is a great gear. Like the man said though, a real tall tire on a 19/20 rim is likely going to need more gear.
 

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Assuming a stock tire size (345/30-19 in your '06), 3000 RPM in sixth gear with 3.73 gears would be 130 MPH.

2100 RPM would work out to roughly 90 MPH.
I don't know, it's been 5-6 years since I did the swap, but I don't recall it being that low of an rpm. I am running the 345/30-19s, and the transmission is stock, so perhaps you're right.

At any rate, it was too tall for me. Around town, it really did feel like a UPS truck taking off in 1st gear. I don't rev to 6K on every shift to go run an errand, so the usable range of 1st gear with 3:73s was pretty short. For the couple times I took it to the drag strip, I needed to launch in first but that 1-2 shift felt like a waste of time. Running a road course might be a different story- those tall gears make the upper half of the gearbox a bit more usable right on past 150.
 

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For street driving, 3.73 is pretty squirrelly. Shifting all the time and gotta really watch yourself coming out of corners. While is is great fun, the tires simply have a hard time putting it down.

3.54/3.55 is a great street gear ratio. Much more energenic than longish 3.07, but it still does not overwhelm the suspension and tires. Great fun, but still controllable. Still have long legs on the freeway, plus 5th and 6th have a little more pep.
 

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How far off is the speedometer after switch in to 3:55 gears? Is there a way to adjust / correct it back to being accurate?
 
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