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Old 03-27-2012, 03:21 PM   #11
TRUEBLUE3934
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I would go with 3.73 if you plan to go FI in the future.
If you want to try a shorter ratio, my next suggestion would be 3.90.

4.10 will be a lot of gear for a street car with boost.

It would be a very good idea to let a reputable performance shop do the gear install.
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Old 03-27-2012, 03:52 PM   #12
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Depending on how much power you have, 410's are no good in the 1/4 because they top out @ 108 in 4th gear, and sometimes that's just not enough. At least with 373's, 4th tops out @ around 120, a good trap speed if blown.
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Old 03-27-2012, 05:12 PM   #13
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Quote:
Originally Posted by TRUEBLUE3934 View Post
I would go with 3.73 if you plan to go FI in the future.
If you want to try a shorter ratio, my next suggestion would be 3.90.

4.10 will be a lot of gear for a street car with boost.

It would be a very good idea to let a reputable performance shop do the gear install.
This.
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Old 03-27-2012, 07:58 PM   #14
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Originally Posted by 4.6Gtconv View Post
I went 4.10's here recently.. I love them. Granted 99% of my driving is 2 miles one way, but even so its not bad.. On the highway doing 70 I was at like 2300 rpm.. its not as bad as some people portray it to be. As for gas millage you wont see any decrease around town.. you just have to shift sooner.. big deal don't be a lazy ***.. but on the highway you will probably loose 1-2 miles per gallon. And in the end you will love them. biggest Seat of the pants Ive had so far.
Like he^^ said.. Dont fear the gear.
For you guys with that .62 OD gear yeah it's not too too bad, for me with my T-45 it's quite a bit higher and is still shying me away from 4.10's. But IMO 4.10 or nothing. I wouldn't even bother with 3.73, at least in a N/A application. If you're going boosted 3.73 is plenty. But if you're really debating, go 3.90, best of both worlds.
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Old 03-27-2012, 08:22 PM   #15
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.. but on the highway you will probably loose 1-2 miles per gallon. .
I lost 1-2 mpg highway with 3:73s I think thats understating/selling it a bit.
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Old 03-27-2012, 08:26 PM   #16
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Quote:
Originally Posted by TRUEBLUE3934 View Post
I would go with 3.73 if you plan to go FI in the future.
If you want to try a shorter ratio, my next suggestion would be 3.90.

4.10 will be a lot of gear for a street car with boost.

It would be a very good idea to let a reputable performance shop do the gear install.
Quote:
Originally Posted by piledriver View Post
Depending on how much power you have, 410's are no good in the 1/4 because they top out @ 108 in 4th gear, and sometimes that's just not enough. At least with 373's, 4th tops out @ around 120, a good trap speed if blown.
This(3:73s) seems to be the majority opinion on another forum also when it comes to gears and a blown car vs an n/a car.
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Old 03-28-2012, 11:10 PM   #17
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I recently went with 4.10's and overall I like the difference, but it would be a lot better with a transmission with a higher first gear, like 2.97 or so. The tremec's 3650's first gear is just way too steep to work well with the 4.10's. second and third seem well suited though. I just need more horsepower.
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Old 03-29-2012, 10:32 AM   #18
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I recently went with 4.10's and overall I like the difference, but it would be a lot better with a transmission with a higher first gear, like 2.97 or so. The tremec's 3650's first gear is just way too steep to work well with the 4.10's. second and third seem well suited though. I just need more horsepower.
This is my feeling exactly, with 3.73s. I installed them just after getting the car in Cecember '06, and before any engine mods. Now, having moved from 220/243 at the wheels to 262/305, and here in Florida where the lime rock McAdam roads are slippery as heck, I almost wish I had stayed with the 3.27s.

My next transmission will be either a TKO 600 with the 2.87 1st gear, or a rebuilt 3650 with the 2.90 1st gear offered by American Powertrain.

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Before anyone asks, I have no (none, zero, zilch, nada) interest is a 6-speed. In any driving I do I already skip 2nd and go directly to 3rd, and when I sometimes launch in 2nd I mostly skip 3rd. I do not want to have more gears to skip in routine driving...
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Old 03-29-2012, 10:32 AM
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