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Old 10-11-2010, 11:05 AM   #1
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3.73 vs 4.10 gears for a M6?

Thinking about getting new gears in the rear, however I'm a little hesitant to go with 4.10's due to all the bad press i've been hearing lately about them failing? What's your thoughts on 3.73's for the m6? I'm not a heavy track guy, just want a little more oomph in the lower gears. Btw this will be going on a car with only a CAI intake, full exhaust, cam and a MGW shifter.
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Old 10-11-2010, 11:10 AM   #2
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I'm sure you'd feel an improvement over stock, but I'm not sure it would be a big enough step up to justify the cost. 4.10's on the other hand make a HUGE difference...I have them and love them. No problems what so ever.
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Old 10-11-2010, 11:17 AM   #3
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You might also consider something in the middle; 3.91's which is what I'm going to look into.
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Old 10-11-2010, 11:42 AM   #4
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i broke my 4.10's after 12k miles... :(
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Old 10-11-2010, 11:55 AM   #5
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Quote:
Originally Posted by Notneb View Post
Thinking about getting new gears in the rear, however I'm a little hesitant to go with 4.10's due to all the bad press i've been hearing lately about them failing? What's your thoughts on 3.73's for the m6? I'm not a heavy track guy, just want a little more oomph in the lower gears. Btw this will be going on a car with only a CAI intake, full exhaust, cam and a MGW shifter.
If you are going with gears, get the 4.10's. This car responds so much better with 4.10s off the line and accelerating up through the gears. I am not a heavy track guy either, my gears are quiet and I have had no problems. It seems a hit and miss problem for breaking these gears, but make sure you go with a experienced installer and a heat cycle break in.
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Old 10-11-2010, 11:55 AM   #6
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Hows your driving style to have broke the 4.10's? Like I said I don't plan on going to the track every week and doing hard launches on slicks or anything like that. I'd love to have 4.10's, I had them in my Lightning and I just love the off the line performance, but like I said, i've heard bad things about the 4.10's in the new camaro rears :s Is it the gears or the installs I guess is my question?
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Old 10-11-2010, 12:12 PM   #7
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Some people blame the 4.10's breakage on these cars due to a smaller O.D. pinion shaft

More ring/pinion teeth

and some claim that people are just breaking them due to improper installation

but I can tell you this.... I had a friend from a very reputable shop do mine (I have installed/setup gears before, but my friend has more experience, and it was just easier to have him do it for me). But the backlash was dead on, the contact patch was damn near perfect, there was no gear whine what so ever, at any speed.

I heat cycled them and changed the fluid twice

After 12,000 miles, I broke off a bunch of teeth on both the ring gear and pinion.
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Old 10-11-2010, 12:24 PM   #8
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Hows your driving style to have broke the 4.10's? Like I said I don't plan on going to the track every week and doing hard launches on slicks or anything like that. I'd love to have 4.10's, I had them in my Lightning and I just love the off the line performance, but like I said, i've heard bad things about the 4.10's in the new camaro rears :s Is it the gears or the installs I guess is my question?
I ordered the gears as soon as they were available early this year. It seems the early sets were the ones that were breaking, so I don't know if I got lucky or just haven't hammered them enough. My installer had been doing gears for thirty years or more. He said that they set up OK, not great but typical for Richmond. He told me to drive for about twenty miles or so and then park and let them cool down. Repeat this several times over. I now have over 4000 miles on them, but I don't do 4000 RPM clutch drop starts either. Just don't like to hammer my vehicles. Richmond has warrantied all the broken gears that I have heard about so far, including a guy around here from Wyo. He has his second set in now, same mods as me. Like him, I just could not go back to 3.45's even if the 4.10's break. Good luck!
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Old 10-11-2010, 12:56 PM   #9
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Yeah I was surprised to hear richmond's gears were breaking like that, normally they have a good product :s That's why I was wondering if it was install or product defect. I'm def leaning towards 4.10's if I can get some feed back on the newer gears and how they're holding up to abuse.
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Old 10-11-2010, 12:57 PM   #10
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Originally Posted by Notneb View Post
Thinking about getting new gears in the rear, however I'm a little hesitant to go with 4.10's due to all the bad press i've been hearing lately about them failing? What's your thoughts on 3.73's for the m6? I'm not a heavy track guy, just want a little more oomph in the lower gears. Btw this will be going on a car with only a CAI intake, full exhaust, cam and a MGW shifter.
With 3.73s in the M6 equipped SS you will realize an equivalent torque gain approximately 10% or 42 lb.-ft. of torque. You are definitely going to notice that. With 4.10s you will realize an equivalent torque gain of approximately 20% or 84 rear wheel lb.-ft. of torque. Either way you are going to get moving a lot quicker than stock. We have sold dozens of sets of Richmond 4.10s and have only seen one set fail. I don't know why the sets that have failed did so, all anyone has is theories, but I know that for every one that has failed there are many more that have had absolutely no issues whatsoever.
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Old 10-11-2010, 01:01 PM   #11
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I guess my next question would be is Richmond the only one putting out 4.10's for the camaro's right now?
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Old 10-11-2010, 02:51 PM   #12
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Anyone with 3.73 and an M6 - what speed does your 3rd gear now top out at?

Just wondering if your at highway speed - 75ish mph, can you still drop to 3rd for a pass. The 3.45s just seem to love that 75 mph downshift to 3rd and then scream to 100ish. I'd like a bit lower gear, but would hate to lose that screaming highway downshift to 3rd.

With LT's, screaming an M6 in 3rd gear from 75 to 100 is just so addicting.
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Old 10-11-2010, 02:59 PM   #13
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Anyone with 3.73 and an M6 - what speed does your 3rd gear now top out at?

Just wondering if your at highway speed - 75ish mph, can you still drop to 3rd for a pass. The 3.45s just seem to love that 75 mph downshift to 3rd and then scream to 100ish. I'd like a bit lower gear, but would hate to lose that screaming highway downshift to 3rd.

With LT's, screaming an M6 in 3rd gear from 75 to 100 is just so addicting.
If you downshift to 3rd at 70 with 3.73s you will turn about 4400 rpm and by the time you hit 100 mph you would be hitting about 6300 rpm.
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Old 10-12-2010, 11:17 PM   #14
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Originally Posted by Notneb View Post
Thinking about getting new gears in the rear, however I'm a little hesitant to go with 4.10's due to all the bad press i've been hearing lately about them failing? What's your thoughts on 3.73's for the m6? I'm not a heavy track guy, just want a little more oomph in the lower gears. Btw this will be going on a car with only a CAI intake, full exhaust, cam and a MGW shifter.
Get the 4.10's, it was one of the best mods I've made. Even if they bust I'll buy another set, that' how much I love em.
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Old 10-13-2010, 01:24 AM   #15
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Get the 4.10's, it was one of the best mods I've made. Even if they bust I'll buy another set, that' how much I love em.
Amen!
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Old 10-13-2010, 01:39 AM   #16
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You guys with 4.10 gears, what rpm are you crossing the traps at in the 1/4 mile? With the 3.45's I'm crossing the stripe at the very top of 3rd gear. I'm contemplating going to 4.10's but I'll be spraying and I don't want to run out of gear.
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Old 10-13-2010, 04:43 AM   #17
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With any power adder, use 3.73 gears. Naturally aspirated, go for the 4.10s or 4.33s.
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Old 10-13-2010, 04:45 AM   #18
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Can anyone rcommend a reputable shop in North Jersey to do a gear swap? Yes I googled...just found a bunch of gas stations......If my baby's goin under the knife....it better be with someone who knows these cars!
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Old 10-13-2010, 05:09 AM   #19
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Since you're are not that far and want the jon done right, by an experienced shop, why not make the drive to Jannetty Racing in CT. Its not that far and its worth the drive and I'm pretty sure they are the only shop around who has done a ton of these with no problems.
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Old 10-13-2010, 07:26 AM   #20
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You might also consider something in the middle; 3.91's which is what I'm going to look into.
Where are you finding 3.91's?
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Old 10-13-2010, 08:36 AM   #21
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I was told by rep from Motive that a 3.91 & 4.10 will be available by January 2011. Maybe they are out now?
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Old 10-13-2010, 09:09 AM   #22
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Can anyone rcommend a reputable shop in North Jersey to do a gear swap? Yes I googled...just found a bunch of gas stations......If my baby's goin under the knife....it better be with someone who knows these cars!
Without hesitation go to Jannetty Racing. Doesn't get any better than Ted. Where are you located in North Jersey?
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Old 10-13-2010, 10:08 AM   #23
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With any power adder, use 3.73 gears. Naturally aspirated, go for the 4.10s or 4.33s.
I disagree.... a power adder car can still have 4,10s, and an automatic should almost never have a 4.10 gear, unless it is seeing lots of track time and has a very sticky tire. Also remember that not every 5th gen has a 6500 redline.
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Old 10-13-2010, 10:25 AM   #24
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I disagree.... a power adder car can still have 4,10s, and an automatic should almost never have a 4.10 gear, unless it is seeing lots of track time and has a very sticky tire. Also remember that not every 5th gen has a 6500 redline.
sure they can....but traction becomes even more of an issue.
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Old 10-13-2010, 10:32 AM   #25
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sure they can....but traction becomes even more of an issue.
K. So they should just drive their car with drag radials 24/7? 4.10s with the 6l80e 1st gear is ridiculous... you are shifting at the 60' mark and driving it on the street would not be soo friendly
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