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Old 11-14-2012, 06:55 AM   #1
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1LE vs non-1LE - How noticable is performance?

For those of you that have upgraded your SS to a new 1LE. How much of a difference is there in performance with the gearing? I know track wise it is probably a no brainer, but I'm just wondering the feel with the 3:91 and different geared trans. I know it won't be the same, but I have been considering go to the 3:91 and just want to hear some of your thoughts. How much harder does it pull?
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Old 11-14-2012, 06:58 AM   #2
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to add to this question any idea on what mileage you are getting yet?
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Old 11-14-2012, 08:37 AM   #3
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I've never ran 3.91's...but on my 4th gen (which also came with 3.42s)...moving to 4.30's and 4.56's made a tremendous difference for me. From a mathematical perspective, 3.91's only offer a 13% increase in torque multiplication. I'm sure you can feel the improvement in acceleration...but nothing like what the 4.30/4.56s offered.
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Old 11-14-2012, 08:55 AM   #4
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Originally Posted by Ebbsnflows View Post
I've never ran 3.91's...but on my 4th gen (which also came with 3.42s)...moving to 4.30's and 4.56's made a tremendous difference for me. From a mathematical perspective, 3.91's only offer a 13% increase in torque multiplication. I'm sure you can feel the improvement in acceleration...but nothing like what the 4.30/4.56s offered.
I just dont want to lose drivablity. I don't drag the car much... maybe once or twice a year. What scares me is that I will do it and hate it. My brother and I surprized my dad a couple years ago and had 4:10's put in his mustang. I actually think that we slowed the car down because you have to shift so quick out of 1st gear. I know the gearing in our trans is completely different... I just don't want to make a mistake.
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Old 11-14-2012, 10:59 AM   #5
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Yeah TTT I have been wondering about this too. Very tempting mod
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Old 11-14-2012, 05:57 PM   #6
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Old 11-14-2012, 09:15 PM   #7
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I think 3.91's would pull way harder in your car than a 1le. The 1le has different gearing in the MN6 transmission. The math has been done a few times on the forum. I am looking forward to finding out first hand soon!!
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Old 11-15-2012, 07:24 AM   #8
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I think 3.91's would pull way harder in your car than a 1le. The 1le has different gearing in the MN6 transmission. The math has been done a few times on the forum. I am looking forward to finding out first hand soon!!
You are saying that the 1LE has a different transmission than the SS? Do you know them or have a link to them?
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Old 11-15-2012, 07:28 AM   #9
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You are saying that the 1LE has a different transmission than the SS? Do you know them or have a link to them?
I know the gearing is different. There was a thread somewhere a while back comparing the standard SS trand to the 1LE. I will try and find it. If you just look at the specs on the 1LE vs the SS it stated the different gear ratio.
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Old 11-15-2012, 07:30 AM   #10
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You are saying that the 1LE has a different transmission than the SS? Do you know them or have a link to them?
Im pretty sure the transmission is the same. The auto and manual are obviously geared different but that has nothing to do with a 1LE. AFAIK just the gear swap and suspension.
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Old 11-15-2012, 07:31 AM   #11
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Im pretty sure the transmission is the same. The auto and manual are obviously geared different but that has nothing to do with a 1LE. AFAIK just the gear swap and suspension.
I don't think that is true. If I remember, the 1LE specifically has different gearing in the trans along with the 3:91 rear end.
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Old 11-15-2012, 07:32 AM   #12
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The transmission is different than the standard SS. It is a close ratio manual trans. I don't have the ratios in front of me but if I have time later I will look it up and post it here for you.
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Old 11-15-2012, 07:37 AM   #13
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Old 11-15-2012, 07:40 AM   #14
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Quote:
Originally Posted by newagemuscle View Post
I don't think that is true. If I remember, the 1LE specifically has different gearing in the trans along with the 3:91 rear end.
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Originally Posted by Monte Mac View Post
The transmission is different than the standard SS. It is a close ratio manual trans. I don't have the ratios in front of me but if I have time later I will look it up and post it here for you.
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Well I stand corrected. I never saw that mentioned before. Guess I cant do a true conversion unless I get a tranny too...well and i have an auto. I intend to add the suspension and 3.91 to my car though.
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Old 11-15-2012, 07:43 AM   #15
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Thanks Comrando, you have a much better representation of the information than I had.
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Old 11-15-2012, 07:47 AM   #16
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Quote:
Originally Posted by newagemuscle View Post
I know the gearing is different. There was a thread somewhere a while back comparing the standard SS trand to the 1LE. I will try and find it. If you just look at the specs on the 1LE vs the SS it stated the different gear ratio.
Here you go:
SS
3.01 / 2.07 / 1.43 / 1 / .84 / .57
10.38 / 7.14 / 4.93 / 3.45 / 2.90 / 1.97

1LE
2.66 / 1.78 / 1.3 / 1 / .74 / .5
10.4 / 6.96 / 5.08 / 3.91 / 2.89 / 1.96

1st line is the trans itself, 2nd line is the final drive ratio after multiplying the trans & diff ratios together.

Taken from Road & Track:
http://www.roadandtrack.com/tests/da...hive#Chevrolet
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Old 11-15-2012, 08:56 AM   #17
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Originally Posted by mattsfirstSS View Post
Well I stand corrected. I never saw that mentioned before. Guess I cant do a true conversion unless I get a tranny too...well and i have an auto. I intend to add the suspension and 3.91 to my car though.
I would suggest the 3.73/3.70 instead. I've read in multiple threads that the auto does better with those vs the 3.90/3.91's. Alot of ppl were saying that it threw them into the next gear a little before the 1/4 finish and got better et's with said gear.
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Old 11-15-2012, 09:00 AM   #18
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I would suggest the 3.73/3.70 instead. I've read in multiple threads that the auto does better with those vs the 3.90/3.91's. Alot of ppl were saying that it threw them into the next gear a little before the 1/4 finish and got better et's with said gear.
Here is your L99 with 3.73



You do understand you will need a tune?
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Old 11-15-2012, 09:18 AM   #19
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Originally Posted by K32 Camaro View Post
I would suggest the 3.73/3.70 instead. I've read in multiple threads that the auto does better with those vs the 3.90/3.91's. Alot of ppl were saying that it threw them into the next gear a little before the 1/4 finish and got better et's with said gear.
Thanks for the info. While you are correct you would need to get to fourth possibly with 3.91 as compared to the 3.73, im not really planning on being the best drag racer in NC. Its more about feel for me, that extra 3% TQ but I will consider the 3.73, thank you. The 3.91 is also cheaper because it is available for the 1LE.

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Here is your L99 with 3.73



You do understand you will need a tune?
Of course I will need a tune thanks for the info bud.
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Old 11-15-2012, 09:19 AM   #20
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Here is your L99 with 3.73



You do understand you will need a tune?
Curious what does it look like with the 3.91? I guess I could do the math myself...:(
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Old 11-15-2012, 09:26 AM   #21
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What is that program?
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Old 11-15-2012, 09:43 AM   #22
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It's the Z06 transmission.

The 2-3 and 3-4 shifts are close ratio for road course racing. It looks like 1st 5th and 6th gear will feel about the same as an SS.

An SS modded with 3.91s should be able to hole shot a 1LE... with the SS's shorter 1st gear and closer 1-2 shift. But the 1LE trans gears will shine on a road course with the closer ratio 2-3 3-4 shifts. No 1st gear corners on most road courses, so no 1-2 shifts.
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Old 11-15-2012, 09:49 AM   #23
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It's the Z06 transmission.

The 2-3 and 3-4 shifts are close ratio for road course racing. It looks like 1st 5th and 6th gear will feel about the same as an SS.

An SS modded with 3.91s should be able to hole shot a 1LE... with the SS's shorter 1st gear and closer 1-2 shift. But the 1LE trans gears will shine on a road course with the closer ratio 2-3 3-4 shifts. No 1st gear corners on most road courses, so no 1-2 shifts.
Great info, thanks. Im certainly not road racing and rarely doing a quarter...the more aggressively geared auto with a 3.91 rear should feel impressive, and run a quick 1/8th.
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Old 11-15-2012, 09:54 AM   #24
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I didn't know the 1LE's had different transmission gear, thanks thread.
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Old 11-15-2012, 10:02 AM   #25
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I didn't know the 1LE's had different transmission gear, thanks thread.
you and me both
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