badasschevy625

Im Buliding up my lt1 and i am considering gears because of there increase in ets but what is the true diff between a 3.73 and a 4.10 keep in mind this is a street car but i want this thing to kick some *** too.

D James

well for max acceleration go 4.10's and pay the price of high rpms and low gas mileage. With my 4.10's I dropped a consistant 2 tenths, there was probably better ET in them cause that day everyone was lower cause of tempature and whatever else. Everyone I talked to said their MPh was 2-3 slower than usual, mine that day was the same, but the gears should have raised it, so it was probably off as well. My guess would be a tenth maybe slightly more difference between the 373 and 410's

On a side note, I always wished I had gone with 456 gears after I got the 410s, with the double overdrive of the M6 you can still cruise with decent rpms, its only a few hundred more rpms with the 456 over the 410s. an A4 I wouldn't go past 410s

Donohue96M6Z28

i wouldnt put 410s in an a4, the rpms would be way to high IMO, but if you got an m6 id go w the 410s

Highlander

Depends on what you want to do:

1) 4.10s will give you easy launching on the street (street drving typical driving) it will place a lot less stress on the engine and you can typically and obviously use higher gears per mph as 4.10s have 10% more torque to the wheels than 3.73.

2) you will have a lot better top end, particularly in 5th gear.. you will tend to eat up 5th gear and 150mph a lot faster. This was my main reason...

3) bad for street tire and hard launches.. you will literally spin the tires everytime...
On the track and normal rain tires (firestone ez50ep) i launched in second gear and smoke the tires all the way to 70mph. It also made 1st gear useless on street tires when racing and it also made the car a bit more "uncontrollable". Uncontrollable in the same that it breaks loose a lot faster... Keep in mind that i had 607rwhp at that moment...

4) if you like slicks..... definetely go for it... it will make 28" an option and that will really improve your times and mph...

5) expect to have a high rpm engine if you want to be able to use the gears properly.. on a stock car you will be limited to 40mph on 1st 61mph on second 83 oin third 108 on 4th and 146 on 5th.... that is using a normal 26.1" tire...

If you have a happier engine you will get a lot better combo for it... Particularly a big cam that surges, will have an easier time getting off idle on the street w/o surging and improving the mph vs gear in the top end...

I would go for it.. i did it and liked it and will be keeping them even when i get my goal of 700rwhp + even if I smoke tire in all the gears which i'm pretty sure is what will happen anyways with a 3.73 and i don't want to go to the added expense of going to the .80 .60 gearset of the 93 m29 tranny to get the good 160mph 5th gear @ 6500rpm.

Capn Pete

IMO, 4.10's are the perfect gear ratio to be using on a 4th-gen using stock size 26" tires (or 28" for heavily modified cars).

I'm currently running 4.10's with my A4 (boo to all you nay-sayers!!) and they work great! They do, however, scream pretty high on the highway (but that's to be expected). With an M6, I think they should be offered as a factory option. In 6th gear, to cruise at ~70 mph is only around ~2000 RPM, which is the same as an A4 with 2.73's!!! So you can still maintain good highway mileage, AND you've got the improved acceleration.

IMO, I wouldn't even consider 3.73's for an M6, and only for an A4 where you want "some" highway mileage would I do it again (again meaning, I had 3.73's last year!). I don't think 4.56's would be good though, since you'd be shifting into 5th gear just before the 1/4 mile.

iiiezekieliii

I have 4.10's on an a4... 18 inch tires on the back... 295/65/18 tire... doesnt seem bad on freeway or street... i love them. I have no cats and running an open plate borla... kinda loud sometimes, but nothing untolerable.

jcornss

^ What he said. I love my 4.10's and I have an A4. I don't know people always talk bad about that combo. BTW, I'm turning ~3000 rpm @ 80 mph.

RedHottG2

4.10's are the best choice IMO for you're set up. I think they are the best choice for any F-body except maybe a real radical set up with a 12 bolt and you need a 3.55 gearing or something like that. Otherwise, I say 4.10 it!!

Formula03

I am thinking of going to 4.10 in my car, my car shifts at 6500 so Idont think I would run out of rpm but, what kind of rpms would they turn at around 75 mph or so.

Highlander

in what gear?? 6th gear??? you will see around 2050rpms with a 26.1" tire... 275/40/17

I suggest this thread... it goes as in depth as one can think of thanks to mr jimlab

http://web.camaross.com/forums/showt...highlight=4.10

Capn Pete

In 4th gear with the A4, it's around ~2800 RPM.

Check this gear calculator for reference. Adjust for 4.10's and a 6500 RPM redline, and you'll see that with stock sized tires, you're good 'til over ~120 mph in 3rd gear! (for 1/4 mile purposes).

Sunsceamer

4:10's in a all motor A4 all day long. The monte ss 85 through87 have 3:73 in them. I had a 86 I put a 700R4 with 410's in and with 26" tires and on I 95 in south florida ( all of you that have been here know that its either a parking lot or the daytona 500) ran with traffic and around most at 3000 rpms with the convertor locked. I think alot of people think a few rpm will murder there engine and gas milage. I went from 3:73's to 4:10's in that combo and lost zero mpg and gain a solid 2.5 mph and 2.5 tenths. My freinds dad put 4:30 in a bolt on M6 LS1 and with stock size drag radials. The car went full wieght 12.1 all day long and we drove it on long trips many times at 90 and rpms and the car didnt feel like it was bad at all. I wander how did all the real 60 70 era muscle cars do it with no od. I think most people are just a little wimpy .

Formula03

Thanks guys I appreciate the help,

bazzi

go 4.10 man, if u got the M6 you have to do it. six gears man. i have it in my LT1, and im glad i put it in there. cars takes off hard.