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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 09-20-2011, 04:32 AM   #1
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Gears and RWHP

I have done alot of reading and see that 3.73's are recommended for the A6 and 4.10's for the M6. My question is at what power does those recommendations no longer make sense? I dont want to put 4.10's in my car just to find out that my first gear is basically useless. I currently have 465 rwhp and my goal is for around the 500 mark. Does 4.10's still make sense for this level of power or should i look into a set of 3.90's instead?
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Old 09-20-2011, 06:59 AM   #2
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I was leaning towards the 3.90's too. I just don't

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Old 09-20-2011, 07:03 AM   #3
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Pete, it depends on how you drive the car. Do you go to the drag strip? 1/4 mile or 1/8? Do you have a long highway commute?
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Old 09-20-2011, 08:49 AM   #4
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I have 4.10s and 4.11s. I feel it is perfect for this car. With it cooling down a bit now, I do have a little traction issue at full throttle above 5k rpm. However, I am still on the stock Pzeros. If I had DRs, it would be a nonissue. You canot go wrong with 3.90, 4.10 or 4.11.
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Old 09-20-2011, 09:52 AM   #5
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Quote:
Originally Posted by Squintz Palladoris View Post
Pete, it depends on how you drive the car. Do you go to the drag strip? 1/4 mile or 1/8? Do you have a long highway commute?
That is the truest answer you could get. It's hard to just blanket answer something like this without more info. Higher HP numbers are probably going to make you want to dial the gear back, but again it can't really be an accurate answer without knowing your goal?


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I have 4.10s and 4.11s. I feel it is perfect for this car. With it cooling down a bit now, I do have a little traction issue at full throttle above 5k rpm. However, I am still on the stock Pzeros. If I had DRs, it would be a nonissue. You canot go wrong with 3.90, 4.10 or 4.11.
Perfect is how we would say most would describe the switch to 4.10/4.11 in the M6.
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Old 09-20-2011, 03:02 PM   #6
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Unless you're running out of RPM in a certain gear at the track with the 4.10s, I'd recommend them over the 3.90s as you won't be able to notice the difference otherwise imho.
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Old 09-20-2011, 03:14 PM   #7
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Quote:
Originally Posted by sneakypete View Post
I have done alot of reading and see that 3.73's are recommended for the A6 and 4.10's for the M6. My question is at what power does those recommendations no longer make sense? I dont want to put 4.10's in my car just to find out that my first gear is basically useless. I currently have 465 rwhp and my goal is for around the 500 mark. Does 4.10's still make sense for this level of power or should i look into a set of 3.90's instead?
We have been putting the 3.45s in the A6 Cars for a long time now and would only recommend 3.91 or 4.11 gears aftermarket.

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Old 09-20-2011, 04:39 PM   #8
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What do you recommend for someone finishing in 3rd gear at 6200 rpm's in a M6? I just don't know which way to go on gears? I know what squintz is talking about and he probably knows how I drive better than most people LOL! I do want to be able to commute on the freeway for long trips and want to eventually run the Texas Mile, but feel the car needs a little more in the 1/4 mile! 3.73 or 3.91's?
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Old 09-20-2011, 06:46 PM   #9
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Ace, for you 3.91s or 4.11s, you need some gear with that cam.

@ OP Chris@SNL/Monster said it best I think. 4.10s unless you are running out of gear.

I'm going with 4.30s in my 9" and will keep them in untill I upgrade beyond a bolton motor. Even then, if I go with a high RPM N/A build I may keep them in there.

Last edited by Squintz Palladoris; 09-20-2011 at 07:57 PM. Reason: lisdecsic
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Old 09-20-2011, 10:20 PM   #10
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Sweet Brad thanks!! I guess you were right, here goes a grand on gears!! DOHH!!
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Old 09-20-2011, 10:43 PM   #11
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Sweet Brad thanks!! I guess you were right, here goes a grand on gears!! DOHH!!
By the time you are done modding that stock diff and upgrading axles and driveshaft you will have just about paid for a 9" or LPE 9.5"
(its the only dead horse smiley we have here)
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Old 09-21-2011, 04:03 AM   #12
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Pete, it depends on how you drive the car. Do you go to the drag strip? 1/4 mile or 1/8? Do you have a long highway commute?
The car is mainly a daily driver with a few trips to the track throughout the year. The car doesnt do too many highway trips but it will be on the occasional road trip.
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Old 09-21-2011, 05:51 AM   #13
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Pete, is your car an M6?
What track do you go to?
What camshaft are you running?
What size tire are you on?
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Old 09-21-2011, 07:48 AM   #14
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Quote:
Originally Posted by blk5genss View Post
What do you recommend for someone finishing in 3rd gear at 6200 rpm's in a M6? I just don't know which way to go on gears? I know what squintz is talking about and he probably knows how I drive better than most people LOL! I do want to be able to commute on the freeway for long trips and want to eventually run the Texas Mile, but feel the car needs a little more in the 1/4 mile! 3.73 or 3.91's?
4.11s on the M6 are Oh So Sweet.

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Old 09-21-2011, 11:42 AM   #15
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I think i'm going to go the 4.10-4.11 route and see how that does for me. If anything it will help get this pig out of the hole.
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Old 09-21-2011, 11:51 AM   #16
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I think i'm going to go the 4.10-4.11 route and see how that does for me. If anything it will help get this pig out of the hole.
We offer fully built differentials with 4.11s posi mod, billet caps and custom set up on and exchange program, so swap is easy and fast.

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Old 09-21-2011, 01:27 PM   #17
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4.11s on the M6 are Oh So Sweet.

Ted.
Ted just one question, will I loose any top end? I really want to do the texas mile and do a bit of hwy driving as well! Right now I'm getting 21-22 mpg with the stock gears.
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Old 09-21-2011, 01:58 PM   #18
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You have the same basic setup as I. I have had my car 163mph with my setup and still climbing. I could never reach the top end in the mile. You will be pulling in 5th and maybe 6th gear. Without the 4.11s, 4th took me to 161mph. Now you must be in at least 5th.
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Old 09-21-2011, 02:10 PM   #19
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hmm i've always wondered about gears as a cam is one of my next options...seems like I would need to talk with you, Ted, about whether to do a built diff with 4.11s or just gears after I do a cam? I am new to wanting to run the 1/4 mile, as I've never had more than a daily driver before, but due time I guess I'll learn more about it
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Old 09-21-2011, 07:47 PM   #20
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Ted just one question, will I loose any top end? I really want to do the texas mile and do a bit of hwy driving as well! Right now I'm getting 21-22 mpg with the stock gears.
Never lose top end because your limited by available power and wind drag.

If anything it should help top end.

Ted.
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Old 09-22-2011, 06:55 AM   #21
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OK thanks!!
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Old 09-22-2011, 10:54 AM   #22
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Never lose top end because your limited by available power and wind drag.

If anything it should help top end.

Ted.
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Old 09-30-2011, 03:47 PM   #23
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4:33's in an M6 with 480 HP works great. Only power adder cars with extra torque need less gear. I shift around town at 2000rpm, 1st, 3rd, 5th. Always take off in first, it is not useless but be ready to shift quick if you stomp it. This gear adds 110 ft lb of torque at launch. My 60ft went from 1.75 with 3:70 gear to 1.60 with 4:33 and more consistent. I can cut 1.60 with 315/35/20 Nitto 555's
Only added 300-400 rpm in 6th and about 1.5 mpg less at 70mph. Traps around 6,300 - 6,400 with 20" Nittos and 6,600 to 6,700 with 295x45x17 Mickeys.

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