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

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Old 09-11-2010, 01:08 PM   #1
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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
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Old 09-11-2010, 01:27 PM   #2
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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!!
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Old 09-11-2010, 02:41 PM   #3
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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.
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Old 09-11-2010, 03:15 PM   #4
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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.
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Old 09-11-2010, 04:45 PM   #5
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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.
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Old 09-11-2010, 05:47 PM   #6
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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.
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Old 09-11-2010, 05:54 PM   #7
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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.
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Old 09-11-2010, 06:07 PM   #8
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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.
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Old 09-11-2010, 06:14 PM   #9
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I'm going with the 4.10's when have gears put in my L99.
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Old 09-11-2010, 06:18 PM   #10
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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?
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Old 09-11-2010, 06:25 PM   #11
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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.
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Old 09-11-2010, 06:35 PM   #12
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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.
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Old 09-11-2010, 06:36 PM   #13
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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.
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Old 09-11-2010, 06:47 PM   #14
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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.
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Old 09-11-2010, 06:54 PM   #15
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shift points WILL have to be adjusted. Well.... i'm 99% sure they will be. If they are anything remotely close to every other gm automatic transmission (I don't have an automatic and I haven't looked at on automatic on hp tuners yet), there is a lot that goes into the pcm's formula to calculate the shift point... one of these variables being your vehicles speed. If this is not accurate, and in this particular case, you will bounce off your rev limiter in a WOT shift.

and if a guy is saying you will light your tires up and is a bad idea to go to a 3.73, I agree with Apex Chase, as I do with everything that he says that is gear related, and say you should steer clear from that guy.

Honestly, your best bet, when looking for someone to do a gear install, is a 4x4 shop. The 4x4 guys always do gears.
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Old 09-11-2010, 10:43 PM   #16
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My speedshop recommended me to swap up to the 3.73's during my second phase of modding my car and I did.
It definitely brings my car into its power band faster and makes it takeoff a whole lot faster.
We've gotten my car (L99) to around 620rwhp and with a good set of Nittos the traction is very good and has no problem hooking up.
I think I was around the $1300ish range and I'm not sure about the tune issue since the car was tuned after all of the mods were completed.
I agree with SuperchargedSS, do it if you finances are there and don't look back you will be pleased!!!
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Old 09-12-2010, 08:43 AM   #17
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Pittbull, thanks for the info. Also you're car has some amazing rwhp there. Did you get a supercharger installed? I will definitely get the gear installed along with a cold air intake mod and tune. Right now I barely have 1800 miles on the car and I only have a Borla Sport catback exhaust and Diablosport tune which was mainly to turn off skipshift and AFM.
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Old 09-12-2010, 09:27 AM   #18
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Quote:
Originally Posted by Supercharged SS View Post
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.

And the gap would increase as the speeds increase. By 100mph or so, the speedo would be way off.
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