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Old 12-22-2013, 02:43 PM   #1
Jeffy14
 
Drives: Camaro SS 2011
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Why is this so cheap? Gear 3.91

Hello guys,

I would like to swap the rear gear ratio of my car.
I was shopping around online and curious about the price difference I found for a 3.91 at about $289 and a 3.70 at $589!

3.91 at$289
http://www.phastekperformance.com/20...-gears-391.htm

3.70 at $589
http://www.phastekperformance.com/20...l380011410.htm

Why would there be such a difference?

Thank you very much

Last edited by Jeffy14; 12-22-2013 at 02:54 PM.
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Old 12-22-2013, 02:49 PM   #2
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Not sure, but maybe it's because the GM 3.91 gear is used in a production car (SS/1LE) and more common?
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Old 12-22-2013, 02:51 PM   #3
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Laws of supply and demand.

The 3.91's are made by AAM for GM for use in the 1LE. GM buys more of a bulk and at one time than an individual company so they get sold to GM for less which results in lower prices for us. Also because GM sales more gears they also don't need as much as a profit per unit as other companies.
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Old 12-22-2013, 02:56 PM   #4
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OK guys thanks
So do you think it is worth it to take 3.91 i/o 3.70?

I read somewhere that 3.91 or more could cause failure. Is that true?
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Old 12-22-2013, 02:58 PM   #5
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Depends on if you have an auto or manual. Generally I see 3.70 recommended for auto, and 3.91 recommended for manual.

I'm swapping out my 3.45 for a 3.91, based on the MANY positive recommendations from others on this site. I've yet to come across someone who regrets getting the 3.91 gear.
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Old 12-22-2013, 03:00 PM   #6
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Quote:
Originally Posted by JMWNERW View Post
Depends on if you have an auto or manual. Generally I see 3.70 recommended for auto, and 3.91 recommended for manual.

I'm swapping out my 3.45 for a 3.91, based on the MANY positive recommendations from others on this site. I've yet to come across someone who regrets getting the 3.91 gear.
I have auto.
What do you have please?
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Old 12-22-2013, 03:04 PM   #7
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Quote:
Originally Posted by Jeffy14 View Post
I have auto.
What do you have please?
<--- It's in my signature. LS3 = manual (L99 = automatic).

I have a couple of threads in this forum where I tried to get feedback from the forum members regarding the 3.91 gear. You might want to search around for those or other similar discussions about the gear swap for the automatic.
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Old 12-22-2013, 03:08 PM   #8
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Quote:
Originally Posted by JMWNERW View Post
<--- It's in my signature. LS3 = manual (L99 = automatic).

I have a couple of threads in this forum where I tried to get feedback from the forum members regarding the 3.91 gear. You might want to search around for those or other similar discussions about the gear swap for the automatic.
OK thank you for your help.
I did not notice your signature

I will look for your threads.

PS: If that's your car, that's a nice once
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Old 12-22-2013, 03:13 PM   #9
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It is, thanks!

Here are a couple of threads from my research and opinion-seeking.

http://www.camaro5.com/forums/showthread.php?t=331998

http://www.camaro5.com/forums/showthread.php?t=329619
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Old 12-22-2013, 06:55 PM   #10
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Quote:
Originally Posted by Jeffy14 View Post
Hello guys,

I would like to swap the rear gear ratio of my car.
I was shopping around online and curious about the price difference I found for a 3.91 at about $289 and a 3.70 at $589!

3.91 at$289
http://www.phastekperformance.com/20...-gears-391.htm

3.70 at $589
http://www.phastekperformance.com/20...l380011410.htm

Why would there be such a difference?

Thank you very much
Those prices are pretty well in line with what you will see anywhere. The 3.91s are actually a GM part but pretty much any aftermarket set of gears for these cars cost $500+. Typically GM parts run more than aftermarket but for what ever reason that is not the case with the gears. The problem with the 3.91s is that it is all but impossible to get your hands on them.
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Old 12-22-2013, 09:14 PM   #11
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Quote:
Originally Posted by Apex Chase View Post
Those prices are pretty well in line with what you will see anywhere. The 3.91s are actually a GM part but pretty much any aftermarket set of gears for these cars cost $500+. Typically GM parts run more than aftermarket but for what ever reason that is not the case with the gears. The problem with the 3.91s is that it is all but impossible to get your hands on them.
Indeed this. We STILL have 15 sets on B/O....which I don't expect for some time to arrive.

If you find a set, buy em. Even if you don't want em. They're worth their weight in Gold to somebody lookin for them.

And 3.91s in an L99 is awesome BTW.
Ivan
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Old 12-22-2013, 09:33 PM   #12
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Set on Ebay as we speak. Says there are 9 sets available actually.

http://www.ebay.com/itm/2010-2013-Ca...5a7840&vxp=mtr
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Old 12-23-2013, 08:06 AM   #13
Jeffy14
 
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Quote:
Originally Posted by Ivan @ Southwest Speed View Post

And 3.91s in an L99 is awesome BTW.
Ivan
OK guys thanks a lot so now the big question that have been asked over and over again.
Is 3.91 too much for automatic if I just have a tuning done and new cat back.

Ivan seems to say this is fine? Even with what I have? People seem to say it will just tear tires etc....
The consensus is 3.73 for Automatic.
Ivan what do you say please?
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Old 12-23-2013, 02:46 PM   #14
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3.91 gears not available in the usa?? I searched several sites, I came to buy and make payment in www.partstaxi.com, only that they canceled the purchase, said they do not have the product available, paid early, I'm expecting to return the money, still not returned. should put an availability before announcing. I want to buy oem gm 3.91 gears. but so far no availability. a friend called an authorized gm, and said that the gears do not have any prediction of availability
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