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

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Old 10-12-2010, 09:11 AM   #26
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Originally Posted by Supercharged SS View Post
Hey Danhr, right now I'm trapping anywhere from 130-132 mph. I'm staring to wonder if some lower gears may be of signifigant help. Off the line and down the strip. 3.45's or 3.70's?

It seems that with any gear other than the stock 3.27's I will be shifting into 5th. With the 3.45's max speed in 4th is 133mph. Thats right where I am at currently and with the 3.73 the max speed in 4th is 123mph. Thats def not going to work.
ummm if I remember your dyno sheet correctly, you keep making power until 6700 or so rpm. That means you should be shifting/redlining around 7000 rpms.

So for you, the max trap speed of a 3.45 gear is 147 mph
3.73 gear is 136 mph.

A couple "special" things about your setup though

A) You are running a bias ply tire. Bias ply tires are known to "grow" on the top end of the track, since they have soft sidewalls and the higher speed. So your 28" tall tire, is going to be more like a 28.4ish tall tire by the time it crosses the traps. The faster your wheel goes, the taller it will get.

B) With most forced induction, they sometimes perform better with less gear, because the motor works better when it has more of a load on it. Well at least I know this to be true with turbochargers, I don't know about superchargers.

With that being said, I can't give an honest opinion on what should perform the best. That would be something to bring up with Ted... maybe he has a better answer than me. I know if it was me, I would be throwing a set of 3.73's in there, when you do the differential bushings. That's just me though...
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Old 10-12-2010, 09:33 AM   #27
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danhr, you did a great write-up.

I'm going to save that as a pdf, so I can always refer back to an outstanding / excellent explanation of gears 101
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File Type: pdf Rear End Gears 101.pdf (82.5 KB, 434 views)

Last edited by CamaroMiami; 10-13-2010 at 05:27 AM. Reason: PDF made for later reference
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Old 10-12-2010, 08:42 PM   #28
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Quote:
Originally Posted by DGthe3 View Post
While its true that the lower the number is, the faster you can ultimately go ... the reason why you go with a higher ratio is so that you accelerate quicker. Having a high top speed does you no good if you can't reach it before you run out of pavement.

Remember, these cars have 6 gears and they don't us all of them in the 1/4. A stock SS M6 will top out at about 110 mph in 3rd gear, which is about what they run in the 1/4. If you had a set of 4.10's it would max out at a little more than 90 mph in 3rd. But shift in to 4th and it can now go up to 130 mph.
Not getting it.
Smaller gear ratio # the faster I can go in a lower gear, but, achieving that higher speed in a lower gear is going to take longer than with higher gear ratio.
So, the only reason why people spend big $$$ on these gears is to save themselves from shifting to a higher gear?
Hmmm...... I don't get it, everyone seems to freak out at how much qucker and more responsive the vehicle is when they change their gears to 4.10's or 3.73's, is it an illusion of the mind. What's the point?
If this is correct, shouldn't I just keep my stock gears?
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Old 10-12-2010, 09:07 PM   #29
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Quote:
Originally Posted by danhr View Post
ummm if I remember your dyno sheet correctly, you keep making power until 6700 or so rpm. That means you should be shifting/redlining around 7000 rpms.

So for you, the max trap speed of a 3.45 gear is 147 mph
3.73 gear is 136 mph.

A couple "special" things about your setup though

A) You are running a bias ply tire. Bias ply tires are known to "grow" on the top end of the track, since they have soft sidewalls and the higher speed. So your 28" tall tire, is going to be more like a 28.4ish tall tire by the time it crosses the traps. The faster your wheel goes, the taller it will get.

B) With most forced induction, they sometimes perform better with less gear, because the motor works better when it has more of a load on it. Well at least I know this to be true with turbochargers, I don't know about superchargers.

With that being said, I can't give an honest opinion on what should perform the best. That would be something to bring up with Ted... maybe he has a better answer than me. I know if it was me, I would be throwing a set of 3.73's in there, when you do the differential bushings. That's just me though...

Ted wants to do the 4.10's. We have a pumkin all set up with his posi-mod allready done. His theory is that the car is so heavy that it needs all the help it can get. I just think thats to much gear and all I will do is blow the tires off. And won't I be into 5th? I've seen these cars with these gears and power just over power the tires and the track. I have very limited wheel spin now so thats why I was thinking the 3.45's to try if I can find an M6 rear. Maybe 3.73's at the max. I'm still unsure so I won't pull the trigget until all my research is complete.

Thank you
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Old 10-12-2010, 09:29 PM   #30
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Quote:
Originally Posted by Supercharged SS View Post
Ted wants to do the 4.10's. We have a pumkin all set up with his posi-mod allready done. His theory is that the car is so heavy that it needs all the help it can get. I just think thats to much gear and all I will do is blow the tires off. And won't I be into 5th? I've seen these cars with these gears and power just over power the tires and the track. I have very limited wheel spin now so thats why I was thinking the 3.45's to try if I can find an M6 rear. Maybe 3.73's at the max. I'm still unsure so I won't pull the trigget until all my research is complete.

Thank you

As a general rule the higher the power of the engine, the less gear you need. You have a much better converter than stock so it will really depend on if you can plant those slicks !! On another fairly high powered car, we put in 4.11s but later switched to 3.70 (Ford 9") and ran a faster E.T. and more MPH. There are so many variables. But it was also a lighter car. These Camaros are pretty beefy.
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Old 10-12-2010, 09:36 PM   #31
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As a general rule the higher the power of the engine, the less gear you need. You have a much better converter than stock so it will really depend on if you can plant those slicks !! On another fairly high powered car, we put in 4.11s but later switched to 3.70 (Ford 9") and ran a faster E.T. and more MPH. There are so many variables. But it was also a lighter car. These Camaros are pretty beefy.

Thanks Bruce. Thats Ted argument. The weight of the car but I'm convinced that with my setup I'll kill the tires with 4.10's. If I go with the tq multiplacation table I think the 3.45's should be gd and keep the car in 4th. 3.73's seem like I'll be shifting into 5th at the end of the pass.
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Old 10-12-2010, 09:47 PM   #32
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Originally Posted by Supercharged SS View Post
Thanks Bruce. Thats Ted argument. The weight of the car but I'm convinced that with my setup I'll kill the tires with 4.10's. If I go with the tq multiplacation table I think the 3.45's should be gd and keep the car in 4th. 3.73's seem like I'll be shifting into 5th at the end of the pass.

Well I have a spare rear diff if you ever want to experiment. I lent it to various people to prototype Camaro components.
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Old 10-12-2010, 09:50 PM   #33
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Quote:
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Not getting it.
Smaller gear ratio # the faster I can go in a lower gear, but, achieving that higher speed in a lower gear is going to take longer than with higher gear ratio.
yes
Quote:
Originally Posted by calbert1999 View Post
So, the only reason why people spend big $$$ on these gears is to save themselves from shifting to a higher gear?
No. They spend the money to accelerate faster, and a consequence is having to shift more often than stock
Quote:
Originally Posted by calbert1999 View Post
Hmmm...... I don't get it, everyone seems to freak out at how much qucker and more responsive the vehicle is when they change their gears to 4.10's or 3.73's, is it an illusion of the mind. What's the point?
If this is correct, shouldn't I just keep my stock gears?
It is very real. 3.73's increase torque at the wheel by about 8% over stock. 4.10's give about 19% more.
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Old 10-12-2010, 11:12 PM   #34
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Well Done Dan. Thank you for the Calculator Time. I know what you put into this.

Great write up. +hp to you.
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Old 03-05-2011, 01:59 PM   #35
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Sticky This Please

Can we get this in a Sticky??
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Old 04-18-2011, 11:45 AM   #36
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Great information!!!!!
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Old 04-27-2011, 09:15 PM   #37
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Wow that what I need.....
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Old 05-16-2011, 11:55 PM   #38
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Awesome write up man.....(now if I could just wrap my mind around how the limited slip diff works)
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Old 01-16-2012, 08:50 PM   #39
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So if I am as good as the testers are and I can turn a 13 flat with a stock SS..What kind of times could I expect to get with a gear swap to 3.73'S or 4.10's ?
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Old 01-16-2012, 09:04 PM   #40
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good question
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Old 01-20-2012, 10:07 PM   #41
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anyone?...
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Old 01-21-2012, 02:39 AM   #42
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What do you have to do to get the speedo correct when the gears are changed? Does this require a tune? Don't want to knock it out of warranty.
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Old 01-21-2012, 04:36 AM   #43
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What do you have to do to get the speedo correct when the gears are changed? Does this require a tune? Don't want to knock it out of warranty.
A tune is required.
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Old 01-31-2012, 01:31 AM   #44
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ok guys, i have a very important question, yal know how they say that in the streets the "mph" matters, right..?? ok since the OP said that the mph will drop, how will that work on a street race..??
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Old 01-31-2012, 01:48 AM   #45
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ok guys, i have a very important question, yal know how they say that in the streets the "mph" matters, right..?? ok since the OP said that the mph will drop, how will that work on a street race..??
1) Don't race on the streets, take it to a track

2) I believe the cars are governed to 155 mph. If you remove the governor, the SS is power limited to something like 170 or 180 mph. But the maximum speed it could theoretically reach in 6th, given enough power, is well over 250 mph. To actually lower the gear limited top speed, you'd have to go and replace the stock gearing with something crazy like a 5.50:1

3) Don't race on the streets, take it to a track
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Old 01-31-2012, 01:54 AM   #46
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i wont race in the streets, but thats my question tho. dont they say the mph matters in the street..?? so how would that work there.? its just a simple question
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Old 02-01-2012, 12:51 AM   #47
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i wont race in the streets, but thats my question tho. dont they say the mph matters in the street..?? so how would that work there.? its just a simple question
It reduces speed if the top speed of the car is actually gear limited. The Camaro is aero-limited, so its not affected unless you do an ultra crazy swap, or are cranking out say twice as much power as stock. And besides that, you'd have to be hitting 180 mph on the streets, and I don't think that even the most reckless street racers do that.
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Old 02-06-2012, 09:37 AM   #48
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what comes stock?

Thanks for this gear info. I don't know if I need to know it but I like knowing it.

Not planning on racing but I would like to take it to a track and see what I can get out of it just for fun.

You have the speeds at different gear ratios in the original post.

Pardone me please if this is already covered, but what is stock? I have the 2010 2SS. So I have the V8 and 6 speed manual transmission.

How do i know what my gear ratio is?

thanks
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Old 02-06-2012, 09:49 AM   #49
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Old 02-17-2012, 12:55 PM   #50
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