3.73 gear in 2SS - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

1Camaro2SS · 09-11-2010, 01:08 PM

Hello to all, I am new here. I am looking to upgrade the gear on my 2SS automatic from stock 3.27 to 3.73. Has anyone done this and how much did it end up costing you? Right now I'm looking at something between $1700 and $2K for parts and labor. Also, has anyone done this and how big of a difference do you see? Thanks

Supercharged SS · 09-11-2010, 01:27 PM

Yes, a lot of guys have done this with no complaints. Price installed is about $1500 installed (ballpark). Gears and install kit are near 8 and figure 6-8 for install. Do it and don't look back!!

SGOS252382 · 09-11-2010, 02:41 PM

I believe you will need a tune for gears in an L99?

When I put gears in my 99Z28 Auto, I had mine tuned to adjust speedo and shift points.

danhr · 09-11-2010, 03:15 PM

as mentioned before... ballpark figure 1500... MAX. if they are going to charge you damn near 2,000... they are raping you for labor costs.

You will need a tune afterwards to change your speedo and shift points.

Apex Motorsports · 09-11-2010, 04:45 PM

Quote:

Originally Posted by 1Camaro2SS

Hello to all, I am new here. I am looking to upgrade the gear on my 2SS automatic from stock 3.27 to 3.73. Has anyone done this and how much did it end up costing you? Right now I'm looking at something between $1700 and $2K for parts and labor. Also, has anyone done this and how big of a difference do you see? Thanks

We can set you up with the ring and pinion and full installation kit package for $775. Installation varies quite a bit by location but $500 for labor is about average so $1500ish for parts and labor would be on the high end. Upgrading the factory 3.27s in the stock A6 equipped Camaro to the 3.73s you will realize an equivalent torque gain of approximately 15% or 61.5 rear wheel lb.-ft. of torque, so its pretty substantial. Feel free to hit me up if you have any questions.

1Camaro2SS · 09-11-2010, 05:47 PM

Thanks guys! I checked with 2 shops in my area and they both said the labor would be $800-$1000 plus all the parts. One shop discouraged me from upgrading to a 3.73. He said I'd be spinning the tires too much and I wouldn't go anywhere. This is hard to believe on an automatic that can barely spin the tires as it is with traction control off. I will need to first find a reputable shop that I can trust then work on the numbers a bit more.

I really want to replace the gear and get more torque at the wheels. I like to hear those tires squeal a bit more when I floor it. I also knew about the speedo tuning but didn't think of shift points. I guess it makes sense.

Apex, thanks for the offer, I will keep it in mind when I'm ready to go forward.

Supercharged SS · 09-11-2010, 05:54 PM

I don't think you need to change the shifts points. I mean for optimum performance, yes, you'll prob want to tweak them, but not required with a gear swap. The car will still shifts as is, which is fine, you'll just get to that specific rpm a little quicker. Just recal on the speedo is all that is "required" and even then its not a huge deal. You can get the formula and do the math in your head so you know what youre real doing and never touch the computers.

And those install prices are a bit on the high side.

SGOS252382 · 09-11-2010, 06:07 PM

Quote:

Originally Posted by Supercharged SS

I don't think you need to change the shifts points. I mean for optimum performance, yes, you'll prob want to tweak them, but not required with a gear swap. The car will still shifts as is, which is fine, you'll just get to that specific rpm a little quicker. Just recal on the speedo is all that is "required" and even then its not a huge deal. You can get the formula and do the math in your head so you know what youre real doing and never touch the computers.

And those install prices are a bit on the high side.

Yeah, I'm not sure how much 3:73s will throw off the speedo. I don't think its all that much.

2010 SSRS · 09-11-2010, 06:14 PM

I'm going with the 4.10's when have gears put in my L99.

SGOS252382 · 09-11-2010, 06:18 PM

Quote:

Originally Posted by 2010 SSRS

I'm going with the 4.10's when have gears put in my L99.

Without tuning, how far off will the speedo be off (3:73 gears, 4:10 gears) at say 60, 80, 100 mph?
Anyone know?

2010 SSRS · 09-11-2010, 06:25 PM

Quote:

Originally Posted by SGOS252382

Without tuning, how far off will the speedo be off (3:73 gears, 4:10 gears) at say 60, 80, 100 mph?
Anyone know?

Not sure how much off, but definitely will probably be way off, I'm having Jannetty Racing do mine and Ted said it will be all tuned to the correct mph.

Supercharged SS · 09-11-2010, 06:35 PM

Quote:

Originally Posted by SGOS252382

Without tuning, how far off will the speedo be off (3:73 gears, 4:10 gears) at say 60, 80, 100 mph?
Anyone know?

There is a formula out there floating around. I remember using it when doing gear swaps in my trucks back when there wasn't computer calibrated speedos, just the good ole plastic speedo gear. If someone smart doesn't chime in I would try some 4 x 4 sites.

Supercharged SS · 09-11-2010, 06:36 PM

Lets try this:

http://www.csgnetwork.com/rgpspeedcalc.html

Looks like at if you did the 3.27 to a 3.73 your actual speed is 52.6 but the speedo would read 60.

Hope this helps.

Apex Motorsports · 09-11-2010, 06:47 PM

Quote:

Originally Posted by 1Camaro2SS

One shop discouraged me from upgrading to a 3.73. He said I'd be spinning the tires too much and I wouldn't go anywhere. This is hard to believe on an automatic that can barely spin the tires as it is with traction control off.

He obviously has no experience with these cars. I'd mark him off the list.

09-11-2010, 01:08 PM	#1
1Camaro2SS Drives: 2010 2SS/RS L99 Join Date: Sep 2010 Location: Grand Rapids, MI Posts: 1,430 View My Garage	3.73 gear in 2SS Hello to all, I am new here. I am looking to upgrade the gear on my 2SS automatic from stock 3.27 to 3.73. Has anyone done this and how much did it end up costing you? Right now I'm looking at something between $1700 and $2K for parts and labor. Also, has anyone done this and how big of a difference do you see? Thanks

09-11-2010, 03:15 PM	#4
danhr BAMF SS Drives: 2016 Camaro 1SS A8 Join Date: Mar 2010 Location: Ford City, PA Posts: 3,023	as mentioned before... ballpark figure 1500... MAX. if they are going to charge you damn near 2,000... they are raping you for labor costs. You will need a tune afterwards to change your speedo and shift points. __________________ 2016 1SS A8: FBO + Circle D + P1X + Meth + Tuned by Pray Performance Stock Longblock 800 SAE rwhp. 9.4 @ 145 mph.

09-11-2010, 06:14 PM	#9
2010 SSRS Drives: 3 V8 Camaros Join Date: May 2009 Location: The Ocean State Posts: 111,187 View My Garage	I'm going with the 4.10's when have gears put in my L99. __________________ Jannetty Racing JRE Street Package

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09-11-2010, 01:27 PM	#2
Supercharged SS Account Suspended Drives: 2010 Camaro Join Date: Feb 2010 Location: Sandy Hook, CT Posts: 11,927	Yes, a lot of guys have done this with no complaints. Price installed is about $1500 installed (ballpark). Gears and install kit are near 8 and figure 6-8 for install. Do it and don't look back!!

09-11-2010, 02:41 PM	#3
SGOS252382 Drives: 2010 Camaro 2SS/RS Join Date: Mar 2008 Location: S.W. Florida Posts: 6,294	I believe you will need a tune for gears in an L99? When I put gears in my 99Z28 Auto, I had mine tuned to adjust speedo and shift points.

09-11-2010, 05:47 PM	#6
1Camaro2SS Drives: 2010 2SS/RS L99 Join Date: Sep 2010 Location: Grand Rapids, MI Posts: 1,430 View My Garage	Thanks guys! I checked with 2 shops in my area and they both said the labor would be $800-$1000 plus all the parts. One shop discouraged me from upgrading to a 3.73. He said I'd be spinning the tires too much and I wouldn't go anywhere. This is hard to believe on an automatic that can barely spin the tires as it is with traction control off. I will need to first find a reputable shop that I can trust then work on the numbers a bit more. I really want to replace the gear and get more torque at the wheels. I like to hear those tires squeal a bit more when I floor it. I also knew about the speedo tuning but didn't think of shift points. I guess it makes sense. Apex, thanks for the offer, I will keep it in mind when I'm ready to go forward.

09-11-2010, 05:54 PM	#7
Supercharged SS Account Suspended Drives: 2010 Camaro Join Date: Feb 2010 Location: Sandy Hook, CT Posts: 11,927	I don't think you need to change the shifts points. I mean for optimum performance, yes, you'll prob want to tweak them, but not required with a gear swap. The car will still shifts as is, which is fine, you'll just get to that specific rpm a little quicker. Just recal on the speedo is all that is "required" and even then its not a huge deal. You can get the formula and do the math in your head so you know what youre real doing and never touch the computers. And those install prices are a bit on the high side.

09-11-2010, 06:36 PM	#13
Supercharged SS Account Suspended Drives: 2010 Camaro Join Date: Feb 2010 Location: Sandy Hook, CT Posts: 11,927	Lets try this: http://www.csgnetwork.com/rgpspeedcalc.html Looks like at if you did the 3.27 to a 3.73 your actual speed is 52.6 but the speedo would read 60. Hope this helps.