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

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Old 10-25-2013, 08:35 PM   #1
AndrewSS/RS
 
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3.91 gears installed

Today I picked up my car after having 3.91 gears installed. It felt strange when I first started driving it. It has been been a few days since I have driven it and I had back surgery since I last drove it as well. The car obviously accelerated quicker but the clutch, parking brake, gear shifter all felt different. When I say different I don't mean anything was wrong everything just felt foreign to me. After driving it for about half an hour or so I got used to it and felt okay with everything once again.

This is one mod where you can easily feel the difference with the butt dyno. I can see this is something I am going to have fun with once I get used to it. This was a difficult install to do where I live. It took call after call in my area until I could find someone to do the install. Found one place out of 20+ phone calls and it was a dealer. Glad I did this mod and would recommend it.
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Old 10-25-2013, 08:44 PM   #2
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Definitely one of the best mods
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Old 10-25-2013, 09:22 PM   #3
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What is the primary reason for changing the gears? Will you be able to accelerate more before having to change gears? Sorry if it's a stupid question, just uneducated on this.
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Old 10-26-2013, 12:51 AM   #4
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you will be shifting faster because you will get to redline and speed faster.
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Old 10-28-2013, 07:51 PM   #5
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What's the approximate cost to have this mod done?
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Old 10-28-2013, 08:43 PM   #6
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Quote:
Originally Posted by AndrewSS/RS View Post
Today I picked up my car after having 3.91 gears installed. It felt strange when I first started driving it. It has been been a few days since I have driven it and I had back surgery since I last drove it as well. The car obviously accelerated quicker but the clutch, parking brake, gear shifter all felt different. When I say different I don't mean anything was wrong everything just felt foreign to me. After driving it for about half an hour or so I got used to it and felt okay with everything once again.

This is one mod where you can easily feel the difference with the butt dyno. I can see this is something I am going to have fun with once I get used to it. This was a difficult install to do where I live. It took call after call in my area until I could find someone to do the install. Found one place out of 20+ phone calls and it was a dealer. Glad I did this mod and would recommend it.
Did the dealer also do the speedo recalc tune to sync the speedo with the new gear ratio?
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Old 10-28-2013, 10:33 PM   #7
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What's the approximate cost to have this mod done?
I paid a little under $700 but I took the rear end out and put it back in the car
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Old 10-29-2013, 06:06 AM   #8
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What is the primary reason for changing the gears? Will you be able to accelerate more before having to change gears? Sorry if it's a stupid question, just uneducated on this.
Torque multiplication. It takes the power you are already making and puts it to better use. Significant increase in acceleration and off the line performance.
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Old 10-29-2013, 07:30 AM   #9
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What are you guys seeing for MPG with 3.91's?
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Old 10-29-2013, 07:46 AM   #10
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What are you guys seeing for MPG with 3.91's?
A little better around town and a little less on the highway. Around town I can get into and hold a higher gear easier which puts the engine at a lower rpm for the same speed.

Honestly, what matters the most is how I chose to drive. When I'm ripping on the gears I try to ignore the gas gauge. When I'm just putting around there is no big difference.
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Old 10-29-2013, 08:10 AM   #11
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Can you put a number on it?
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Old 10-29-2013, 08:42 AM   #12
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Can you put a number on it?
It depends on where and how you drive your car. If you drive around town you will get better fuel economy. On the interstate you will see a slight decrease. On average it is probably a wash. At worst you might see a 2-3MPG reduction.
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Old 10-29-2013, 01:12 PM   #13
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What are you guys seeing for MPG with 3.91's?
25-26mpg@75mph. Generally I lost 2mpg. highway gained 1-2mpg in town. but I just want to romp on it all the time now
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Old 10-29-2013, 10:28 PM   #14
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The install at the dealer cost me about $850. I considered it a deal since they were the only place I found find to do the install. As for gas mileage, I tend to get on the gas pedal (too much) and I do more city driving instead of highway but I haven't noticed a big difference in my mileage. It seems about the same for me.

I will second that with increased torque and acceleration. Even with this the car is smooth and stable during acceleration. This is my favorite mod so far.

The dealer did not do any changes for the speedometer. I had the email tune from Jannetty Racing.
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Old 10-29-2013, 11:20 PM   #15
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i got my installed for free since i use the voucher i got at camarofest but yeah i get around 20.9 in town and 24.7 on highways! which is pretty good if you ask me.. after all i go through all the gears and i do red line it alot when i get on the highway.. (who puts a stop sign merging into the highway?! always have to speed up so i dont get hit.. also its not even a straight shot.. its a 90 turn onto the highway..)
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Old 10-30-2013, 09:16 AM   #16
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i got my installed for free since i use the voucher i got at camarofest but yeah i get around 20.9 in town and 24.7 on highways! which is pretty good if you ask me.. after all i go through all the gears and i do red line it alot when i get on the highway.. (who puts a stop sign merging into the highway?! always have to speed up so i dont get hit.. also its not even a straight shot.. its a 90 turn onto the highway..)
Can't beat that!
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Old 10-31-2013, 06:01 AM   #17
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i got my installed for free since i use the voucher i got at camarofest but yeah i get around 20.9 in town and 24.7 on highways! which is pretty good if you ask me.. after all i go through all the gears and i do red line it alot when i get on the highway.. (who puts a stop sign merging into the highway?! always have to speed up so i dont get hit.. also its not even a straight shot.. its a 90 turn onto the highway..)
You get 20.9mpg/city?? Wow, puts my 9mpg/city to shame! And I baby the shit out of my car!
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Old 10-31-2013, 01:18 PM   #18
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9mpg how big of a cam. i can't get that low without the wheels spinning.
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Old 10-31-2013, 02:06 PM   #19
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You get 20.9mpg/city?? Wow, puts my 9mpg/city to shame! And I baby the shit out of my car!
I can relate.
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9mpg how big of a cam. i can't get that low without the wheels spinning.
Mine is the JRE rough idle cam included in the 480RWHP package. I tend to drive a lot harder than I did prior to the cam, and that really sucks down the fuel.
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Old 10-31-2013, 04:25 PM   #20
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It depends on where and how you drive your car. If you drive around town you will get better fuel economy. On the interstate you will see a slight decrease. On average it is probably a wash. At worst you might see a 2-3MPG reduction.

Yup... this is what I seen reduced in my mpg on highway. I "was" getting 25 to 27 mpg and now 21 to 23. (cruise control on)

When I mega performance modded my motor 2 years ago, my hwy mpg increased which I feel due getting greater efficiency of the increased power/torq

In town, I forget to reset/ clear and then look, but the improved fun of the 3:91's city mpg doesn't matter to me
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Old 10-31-2013, 05:24 PM   #21
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I agree with it all..... I got the 3.73 cause I have an auto... was totally different a lot more fun to drive... killed my gas but who cares.....
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Old 10-31-2013, 05:36 PM   #22
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You get 20.9mpg/city?? Wow, puts my 9mpg/city to shame! And I baby the shit out of my car!
holy crap! 9MPG? what do you have in that car!? lol i put down 420rwhp and i get 20.9 lol actually since i had the car back its at 20.6. 2 months being in the shop does that lol
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Old 10-31-2013, 10:08 PM   #23
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holy crap! 9MPG? what do you have in that car!? lol i put down 420rwhp and i get 20.9 lol actually since i had the car back its at 20.6. 2 months being in the shop does that lol
I have the Night Fury (Supposedly) and all my driving is city. My Camaro is not a daily so it doesnt bother me. I typically only drive it about 2 or 3 times a month. On the highway I get about 22mpg. The overlap of the cam is what kills the mpg. Im in process of getting things ready for my semi-bullet proof diff build. I have the extra diff, 3.91 w/install kit, and 1 piece driveshaft. Just need to order the TruTrac and billet caps and find someone capable of doing the build without having to ship it out to be done.
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Old 10-31-2013, 10:23 PM   #24
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1/4 mile difference??
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Old 10-31-2013, 10:26 PM   #25
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I would assume a pretty good difference if you can get the car off the line. With torque multiplication, you're more susceptible to wheel spin. But in theory the engine revs faster, which gains speed faster. Only downside is you are guaranteed to hit 4th gear before the stripe. Would prolly lose MPH because of that.
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