4:10's with an a4?
Thanks, Mark
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I wonder how many of those that say 4.10 is to steep have actually ever ran it? There is only a couple of hundred rpm difference at 70 mph when compared to 3.73.
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I would run the 28"s and use the 4.10 gear, a car with more gear and a taller tire will leave good. Compared to an A4, 4.10's would actually be like a 4.72 rear gear in a T-56/M6. People do run cars with more 1st which are usually higher rpm stuff.
As far as the idea, I think the 4.10 with the 28 or 28.5 tire would work good and I know people talk about rpm on the freeway and stuff, but with the taller tire and 4.10's you'll be close to the ratio of 3.73's but you'll have the advantage of a bigger tire.
I say go for it. I've had 3.42, 3.73, 4.10 and 4.56 in my T-56 car. The 4.56 would be close to your 1st gear ratio with 4.10's and a 3.73 in an A4 would be like a 4.30 gear in a T-56 to get the same 1st gear.
Just keep in mind that if you add nitrous or FI you might be limited by mph range with that much gear, so you'll need a higher revving cam if you start to get up there in mph.
I ran 4.10's behind my 4L60E for a good ~2 years or so. They worked AWESOME!!
Even on my street tires, it cut my 1/4 mile time from ~13.4 down to 13.02! (and I picked up almost 2 mph).I ALSO had 3.73's back in 2003. They worked fine, although I had a "whiny" gear set, so they didn't stay in the car very long.
On the highway, both 3.73's and 4.10's are VERY similar. My "average" fuel mileage never changed much between the stock 2.73's, to 3.73's, to 4.10's. I always seem to get ~230 miles to a tank (+/- a bit) no matter what ratio I've been running. 100% highway, the mileage got cut from ~310 miles down to ~265 or so from 2.73's --> 4.10's. Oh well!

Traction? Let's see, wasn't an issue at all! With the low ratio, IF/WHEN you spin the tires off the line, it's actually at a slower "speed" than if you had something higher (ie: 2.73's or 3.23's) and the tires actually hook up much quicker than if you get them spinning with high gears! Surprising, eh?

I wouldn't hesitate to run 4.10's behind an A4 again, except I've gone a completely different direction with my car at this point (I've already swapped the 4L60E for a T56, and I have a set of 3.73's to go in ... all for road racing
).Keep in mind, for drag racing, the goal is to cross the line in your 1:1 gear, which is 3rd for the A4, and 4th for the M6. Guess what, it doesn't matter what transmission you've got, if you're running a 4.10 behind either one, it's the exact same RPM's!!


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