Yes, 4.56's would be a mistake for an A4 road car, IMO.
However, 4.10's are ideal for an M6 in an F-body.
4.56's are good with M6's too, and some guys with T-56's in the heavier B-bodies claim the 4.56 rear is perfect, as long as they have the .5 OD version of the T56.

 

I had 3.73s in my old rear end just got my new rear end installed a few months ago and it came with 4.10s i love it perfect gear for a 6spd car at 70mph it tacks around 2000-2100. They should come factory with 4.10s

 

Yeah in my a4 it was equivalent to driving a chainsaw. I just do not want to jeopardize the drivability of the car because I do drive it quite frequently.... first gear has to be really short with 410s. How about spining the tires ? It must be fairly easy to spin them

 

I need new tires so kinda hard to say but with the old drag radials that r on the car ya they break loose to easy even at a 20 roll they break loose like its in ice

 

Launching with steep gears is a lot easier than with milder gears. The steeper gears help you walk that fine line between bogging and spinning. You have much better control with throttle modulation.

 

Launching with steep gears is a lot easier than with milder gears. The steeper gears help you walk that fine line between bogging and spinning. You have much better control with throttle modulation.

Bowtie is absolutely right. 4.10s are PERFECT for a M6, 6th gear is usable for me from 50 mph on up, with a stock cam down to 45 mph. Sure it's more shifting up to cruising speed but you can skip gears. If you end up racing it the 4.10s will help your 60' and you'll get a long pull in 4th through the lights instead of 3rd with 3.42s.

 

OP

you can use this link to calculate RPM's after you fill the fields in

Gear Calculators Courtesy of Richmond Gears

FWIW T56 and 4:10's =

with my tire size (27") my 6th gear RPM's = what they were with the 4L60E and 3:08's in OD (4th)

At 80 mph I am just kissing 2k RPM's...YMMV

 

My old camaro was a wimpy 165 hp 245 tq 305 M5 We installed a holley 650 cfm carb, (didn't do much ) we installed a set of off brand Longtubes (didn't do much ) we even bought a holly performer intake (didn't do much ) and finally my dad said let's swap the rear end out. A set of 4.10's got that baby moving, for a 305 she was stout. I'm sure you will love a set of 4.10's behind that thing.

 

Ive had 3.42s, 3.73, and 4.10s so far i like the 4.10s the best

 

Thanks guys for all the input. I am just a little gun shy because i do drive this car alot and i just dont want jeopardize the drivabilty of it. I think i am going to go with the 410s

 

Do you know anyone with 4.10s you could get a ride with? I DD a 5 spd Honda Fit and a old Civic before that and believe it or not I find normal driving/shifting them to be very similar to my T/A with 4.10s. Except of course when I put the wood to the LT1. I initially had misgivings about 4.10s when I drove with them in a spare 10 bolt I built up but I ended up liking them so much that I got them in my S60. I almost went with 4.30s.

 

I dont think ull regret it

 

I dont know any one with that gear ratio. I was just worried about the rpm in 6th gear i guess because i didnt want the rpms to high. What is a good make gear to use ? I always used moser stuff but am open to any brand

 

Don't worry about the rpms in 6th, I spin about 2k at 70. Check out this gear calculator, http://f-body.org/gears/
The ratio in 6th is .50 and with 4.10s that gives a overall ratio of 2.05 which is quite tall, no worries there.
I used AAM gears which are what GM uses and they were quiet.

 

Don't worry about the rpms in 6th, I spin about 2k at 70. Check out this gear calculator, http://f-body.org/gears/
The ratio in 6th is .50 and with 4.10s that gives a overall ratio of 2.05 which is quite tall, no worries there.
I used AAM gears which are what GM uses and they were quiet.

That site doesn't load?

 

I would go 373's because you will retain more mpg driving to work and they are stronger gears than 410s and they will whine less.

 

My 4.10s dont whine anymore than my 3.73s its all how there installed. And the fuel milege u loose on the highway wich aint much a mile or 2 u gain in town

 

......And the fuel milege u loose on the highway wich aint much a mile or 2 u gain in town

Very true!

KW