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Old 01-31-2014, 12:05 AM   #1
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The truth about gears..

I will try to answer a few concerns I see about gears such as, theoretical times and speeds in each gear.

Will 4.10's lower my ET and make my car faster? In some situations, yes they can. In others, no.

If I put 4.56's in my 2V can I outrun an LSx or Coyote? No, not ever, unless you have a ton of boost or enough spray to blow your self up and the LSx or Coyote is 100% stock.

Will gears give my car more power? Simple answer - NO.


So, let's get started. All runs are simulated using the most accurate specs possible.

This simulation uses the following:
Air temp - 65F
Barometric pressure - 29.38
Relative humidity - 55%
Elevation - 0 Feet
Neutral air (no wind)
0% Road grade
Granny shifting at .38 seconds per shift
Rolling resistance of .013%
Tire expansion factor of .020%/MPH
Tire pressure at 35 PSI
Wheel and tire weight of 45 lbs each
1 foot of roll-out
Mechanical losses of 15% (transmission, clutch, differential, belts, axles, bearings, etc)
1 inch diameter drive shaft @ 25 lbs.
All cars assume a .34 coefficient of drag as this is typical of these types of cars and finding out the actual drag coefficient isn't easy.


First up, the new edge (1999 - 2004) GT 5spd (Don't have the needed data for the NA Cobra and Mach 1).

260 BHP @ 5250
302 LB-Ft @ 4000
6000 RPM redline.

Transmission gears: 5
3.37
1.99
1.33
1.00
.67

Tire size: 255/40-17

Final drive ratio: 3.27:1

Seconds - MPH
2.1 - 30
2.9 - 40
4.7 - 50
5.9 - 60
8.2 - 70
10.0 - 80
12.2 - 90
15.8 - 100

1320 - 14.6 @ 96.4 MPH

Speed in gears
1 - 41 MPH
2 - 70
3 - 104
4 - 140
5 - 147 - Drag limited


Final drive ratio: 3.55:1

2.0 - 30
3.5 - 40
4.5 - 50
5.8 - 60
8.1 - 70
9.9 - 80
12.1 - 90
15.6 - 100

1320 - 14.6 @ 96.5 MPH

Speed in gears
1 - 38 MPH
2 - 64
3 - 96
4 - 130
5 - 149 - Drag limited

Final drive ratio: 3.73:1

Seconds - MPH
1.9 - 30
3.4 - 40
4.4 - 50
5.7 - 60
7.9 - 70
9.7 - 80
12.7 - 90
15.4 - 100

1320 - 14.5 @ 97.1 MPH

Speed in gears
1 - 36 MPH
2 - 61
3 - 92
4 - 123
5 - 149 - Drag limited


Final drive ratio: 4.10:1

Seconds - MPH
1.8 - 30
3.3 - 40
4.3 - 50
6.3 - 60
7.8 - 70
9.7 - 80
12.7 - 90
15.5 - 100

1320 - 14.5 @ 96.9 MPH

Speed in gears
1 - 33 MPH
2 - 55
3 - 83
4 - 111
5 - 148 - Drag limited


2005 - 2010 GT 5 Spd
315 BHP @ 6000
325 LB-Ft @ 4250
6500 RPM redline.

Transmission gears: 5
3.38
2.0
1.32
1.00
.68

Tire size: 255/40-19

Final drive ratio: 3.31:1

Seconds - MPH
2.1 - 30
2.8 - 40
4.3 - 50
5.4 - 60
6.7 - 70
8.2 - 80
10.8 - 90
13.0 - 100

1320 - 13.9 @ 103.8 MPH

Speed in gears
1 - 47 MPH
2 - 80
3 - 123
4 - 163
5 - 157 - Drag limited


Final drive ratio: 3.55:1

Seconds - MPH
2.0 - 30
2.7 - 40
4.3 - 50
5.3 - 60
6.6 - 70
8.8 - 80
10.8 - 90
12.8 - 100

1320 - 13.8 @ 104.4 MPH

Speed in gears
1 - 44 MPH
2 - 75
3 - 114
4 - 152
5 - 155 - Drag limited


Final drive ratio: 3.73:1

Seconds - MPH
1.9 - 30
2.6 - 40
4.2 - 50
5.2 - 60
6.5 - 70
8.8 - 80
10.6 - 90
12.7 - 100

1320 - 13.8 @ 104.4 MPH

Speed in gears
1 - 42 MPH
2 - 71
3 - 108
4 - 144
5 - 158 - Drag limited


Final drive ratio: 4.10:1

Seconds - MPH
1.8 - 30
3.1 - 40
4.0 - 50
5.1 - 60
7.1 - 70
8.6 - 80
10.4 - 90
13.3 - 100

1320 - 13.8 @ 101.9 MPH

Speed in gears
1 - 38 MPH
2 - 65
3 - 98
4 - 131
5 - 160 - Drag limited


Final drive ratio: 4.56:1

Seconds - MPH
1.6 - 30
3.0 - 40
4.0 - 50
5.7 - 60
7.0 - 70
8.5 - 80
11.0 - 90
13.1 - 100

1320 - 13.8 @ 102.9 MPH

Speed in gears
1 - 34 MPH
2 - 58
3 - 88
4 - 117
5 - 159 - Drag limited


2011 - 2014 3.7 V6 MT82
305 BHP @ 6500
280 LB-Ft @ 4250
7000 RPM redline.

Transmission gears: 6
4.23
2.53
1.66
1.23
1.00
.70

Tire size: 235/50-18

Final drive ratio: 2.73:1

Seconds - MPH
2.3 - 30
3.1 - 40
4.6 - 50
5.9 - 60
7.3 - 70
8.9 - 80
11.7 - 90
14.2 - 100

1320 - 14.3 @ 100.5 MPH

Speed in gears
1 - 50 MPH
2 - 84
3 - 128 (Limiter 113 MPH)
4 - 175
5 - 217
Drag limited - 157 MPH

Final drive ratio: 3.31:1

Seconds - MPH
2.0 - 30
2.7 - 40
4.3 - 50
5.4 - 60
7.5 - 70
9.2 - 80
11.2 - 90
13.4 - 100

1320 - 14.1 @ 102.5 MPH

Speed in gears
1 - 41 MPH
2 - 69
3 - 105
4 - 143
5 - 177
Drag limited - 157 MPH


Final drive ratio: 3.73:1

Seconds - MPH
1.8 - 30
3.1 - 40
4.1 - 50
5.2 - 60
7.3 - 70
8.9 - 80
10.8 - 90
13.9 - 100

1320 - 14.0 @ 100.3 MPH

Speed in gears
1 - 36 MPH
2 - 61
3 - 93
4 - 127
5 - 157
Drag limited - 155 MPH


Final drive ratio: 4.10:1

Seconds - MPH
1.6 - 30
3.1 - 40
4.1 - 50
5.9 - 60
7.3 - 70
8.8 - 80
11.5 - 90
13.8 - 100

1320 - 14.1 @ 101.1 MPH

Speed in gears
1 - 33 MPH
2 - 55
3 - 85
4 - 115
5 - 142
Drag limited - 154 MPH


2011 - 2014 GT MT82
420 BHP @ 6500
390 LB-Ft @ 4250
7000 RPM redline.

Transmission gears: 6
3.66
2.43
1.69
1.32
1.00
.65

Tire size: 255/40-19

Final drive ratio: 3.31:1

Seconds - MPH
1.8 - 30
2.3 - 40
3.7 - 50
4.6 - 60
5.6 - 70
7.5 - 80
8.9 - 90
10.4 - 100

1320 - 13.0 @ 110.0 MPH

Speed in gears
1 - 47 MPH
2 - 71
3 - 103
4 - 132
5 - 176
Drag limited - 173 MPH


Final drive ratio: 3.55:1

Seconds - MPH
1.7 - 30
2.2 - 40
3.6 - 50
4.5 - 60
6.2 - 70
7.4 - 80
8.7 - 90
11.0 - 100

1320 - 13.0 @ 110.9 MPH

Speed in gears
1 - 44 MPH
2 - 66
3 - 96
4 - 123
5 - 164
Drag limited - 166 MPH


Final drive ratio: 3.73:1

Seconds - MPH
1.6 - 30
2.1 - 40
3.6 - 50
4.4 - 60
6.1 - 70
7.3 - 80
8.6 - 90
10.9 - 100

1320 - 13.0 @ 111.4 MPH

Speed in gears
1 - 42 MPH
2 - 63
3 - 91
4 - 117
5 - 155
Drag limited - 170 MPH

Final drive ratio: 4.10:1

Seconds - MPH
1.4 - 30
2.6 - 40
3.5 - 50
5.0 - 60
6.0 - 70
7.1 - 80
9.1 - 90
10.7 - 100

1320 - 13.0 @ 108.5 MPH

Speed in gears
1 - 38 MPH
2 - 57
3 - 83
4 - 106
5 - 141
Drag limited - 174 MPH
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Old 01-31-2014, 12:10 AM   #2
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Thats a lot of numbers
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Old 01-31-2014, 12:24 AM   #3
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Let me guess..... Add more power instead of gears? I'm assuming that's what "big gears in slow cars" meant.

I see the numbers. But I'm getting my 4.10s for a different reason than overall speed.
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Old 01-31-2014, 12:39 AM   #4
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Quote:
Originally Posted by Soccerluvr4 View Post
I see the numbers. But I'm getting my 4.10s for a different reason than overall speed.
Agreed. I'm getting them because the fun-to-dollar ratio haha.
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Old 01-31-2014, 01:44 AM   #5
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Agreed. I'm getting them because the fun-to-dollar ratio haha.

I'm more getting them for autocross. It'll help keep me in the higher rpms through tight corners so I can get right back on it.
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Old 01-31-2014, 10:27 AM   #6
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Good **** ish. This was needed as there are about 70 gear threads going on.

There should be a universal gear thread. Or the mods should at least start moving all new gear threads to existing ones. We all know how much they like to move threads. It will be fun for them.


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Old 01-31-2014, 10:35 AM   #7
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Good info although this stuff should be taken with a grain of salt. I dropped my 1/4 times considerably in my 95 Cobra by going from the 3.08s to the 3.73s but that's not in a vacuum. YMMV.

Personally I prefer bigger power that does not need stupid tall gears to do a decent time down the 1/4. Also nothing like cruising at 90mph at 2200 RPM lol.

However, as ppl like Grabber have illustrated especially with the new 5.0s doing the gear thing is not always going to be a good option. Ppl putting 4.10s and such in the new cars making 400+ to the tires... on street tires... have fun just blowing your treads off and going nowhere.
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Old 01-31-2014, 02:38 PM   #8
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I did this to show the difference in times and performance can do along with how much it changes the gearing. While I tried to make this real as accurate as possible it should only be used as a baseline. It does not translate 100% into the real world.

There are too many threads about gear swaps and too many recommendations about going to big gears when there is very little improvement if there is any at all.

For the vast majority of people, a 3.55 - 3.73 will provide the best acceleration and usability.


If I wasn't so swamped at work I had planned on posting some graphs of acceleration and g-force over time. My schedule at the moment won't allow for that until later this weekend.
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Old 01-31-2014, 02:52 PM   #9
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Very god info in here. Maybe it'd be a good idea to make it a sticky??
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Old 01-31-2014, 03:47 PM   #10
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More power is always awesome... Can't deny that gears are a good substitute though..... Still an awesome write up.. I'll see about this possibly being a sticky.
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Old 01-31-2014, 04:04 PM   #11
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For stick approval, I could tidy it up and remove The first part of the post. Or the mods could.
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Old 01-31-2014, 05:19 PM   #12
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Quote:
Originally Posted by Ish416 View Post
...For the vast majority of people, a 3.55 - 3.73 will provide the best acceleration and usability...
+1
Thanks for the numbers, "what are my best gears" varies between platforms, engines, transmissions; and expected daily use.
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Old 02-01-2014, 07:21 PM   #13
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Thanks for the chart! I still kick myself for getting the standard 2.73 in my 2013 Mustang V6. Could have spent $300 for 3.31 when ordered the car. 1/2 sec off 0-60 w/ 3.31 vs 2.73!
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Old 02-01-2014, 08:53 PM   #14
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Some of these numbers(I can only attest to the 99-04GT part) are misleading and make me cringe. But I appreciate the effort and comparisons. Overall a great post.
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Old 02-02-2014, 12:43 PM   #15
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Good stuff Ish, but that post is like 5 feet long... Some charts or graphs or something would be helpful in making it less confusing.

THEN it would be sticky material...
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Old 02-05-2014, 06:00 AM   #16
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I don't think I noticed any numbers covering the 1999 3.8L. Would 4.10s be too big of a car pushing 120k miles?

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Old 02-05-2014, 07:05 AM   #17
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Quote:
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I don't think I noticed any numbers covering the 1999 3.8L. Would 4.10s be too big of a car pushing 120k miles?
I can see what I can find for the new edge 3.8L...

---------- Post added at 08:05 AM ---------- Previous post was at 08:05 AM ----------

Quote:
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Good stuff Ish, but that post is like 5 feet long... Some charts or graphs or something would be helpful in making it less confusing.

THEN it would be sticky material...
I will be updating this likely today as I am basically snowed in.
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Old 02-05-2014, 12:01 PM   #18
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I too can help with the graphics. My high school life was engulfed in 3D Design, and my college career includes all types of design.
I believe the gear ratios are the same for the 3.8
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Old 02-05-2014, 04:15 PM   #19
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you must have ALOT of free time.... I never go over 75 mph, but I want to get there ASAP, hence steep gears and/or more powa
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Old 02-06-2014, 09:49 AM   #20
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you must have ALOT of free time.... I never go over 75 mph, but I want to get there ASAP, hence steep gears and/or more powa
Actually you need to lower your gear ratio and more power. Also if you move to a different transmission you have to take the 1st gear ratio into account too. And tire size.
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Old 02-06-2014, 03:06 PM   #21
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The joys of running a business ... never have free time, even when you think you will.

I was going to create some excel graphs of each car with all the gear sets with mph and time to show the actual differences. I was also going to try to come up with something that would show the g-forces over time.

So, at this point, I don't know when I will have the graphs done. If anyone is good with excel or anything that can make graphs, feel free to use the data I provided. If anyone wants to try this but needs more data, send me a PM or just post here.
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Old 02-13-2014, 03:34 PM   #22
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So .. Finally an update that will be easier to follow.

I will be adding automatics, Mach 1 / NA Cobras and 94 GT, 96 GT, V6 3.8 and 4.0 also. Will also try to make G-force graphs for all cars.


99 - 04 GT






05 - 10 GT






11+ 3.7 V6






11+ 5.0 GT




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Old 02-13-2014, 05:43 PM   #23
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Old 02-13-2014, 06:57 PM   #24
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so what happens to the next guy that ask about gear choice? lol
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Old 02-13-2014, 07:47 PM   #25
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so what happens to the next guy that ask about gear choice? lol
Ever see Clerks 2?

Hell I'm going to be dropping to 3.55s when I finally find a good Termi IRS to swap in and then probably to the 3.08s on my shelf when I do the Tork Tech. 3.08 rear times 3.37 3650 first gear= almost perfect 10:1 ratio which is what you want for a bigger power car and street tires. Also gives me a crazy overdrive regardless if I get the .68 or .62 final ratio.
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Old 02-14-2014, 08:22 AM   #26
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Sounds good. I wasn't critizing the work on the graph, just where it shows a tenth gain in 1/4 is ridiculous. Anyone knows you can pick up tenths in an 1/8th....with a common gear swap.......
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Old 02-14-2014, 12:07 PM   #27
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Sounds good. I wasn't critizing the work on the graph, just where it shows a tenth gain in 1/4 is ridiculous. Anyone knows you can pick up tenths in an 1/8th....with a common gear swap.......
That all depends on how much more you have to shift.

If your passing through the beams at the top of second on stock gears (in the 1/8), with a gear swap to a lower gear, that will require an extra shift into 3rd. The time you spend shifting into third will nearly kill any advantage the lower gears had.

I have seen and been in several cars that have had a gear swap, some can pick up .3 seconds, others lose that much.

It all depends on the internal gearing, RPM, tire size and finally rear gear.


Also, gears are great for short distances, in the long run it usually doesn't make much, if any difference.
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Old 02-14-2014, 12:11 PM   #28
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I gotcha, just so many variables...An old buddy of mine wanted his chevelle faster and it was already quick, we told him to lose 250lbs. He was huge lol
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Old 02-14-2014, 12:17 PM   #29
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Ish416 You did a great job trying to educate the youth. This is way to challenging for them the WWW is not ready for this level of education. Government schools. What are you going to do? I can support your data with track times. It's scarry close to perfect. They don't get gear, tire dia. rpm at all. There are other variables but it's off topic and I don't want to scramble minds any more than they already appear. If I can ever dead hook leave at 4500 I'm going to rant for a month! Thanks for the data. Nice work.
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Old 02-14-2014, 12:26 PM   #30
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Hey, don't make fun of my guverment edgucashun!
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Old 02-15-2014, 10:21 AM   #31
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Sic humor! Remember there is a relationship of the gear to the "stock" tire diameter. Change either one and it has an effect. Again, my stock tire is 27.6" tall with a 3.55 gear. My drag radials are 26" tall and thus lowers my gear to 3.75. I shift sooner in each gear and get to the stripe now at 5750 rpm rather than 5400 in 4th gear. Drive it like it owes you money!
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Old 02-15-2014, 09:19 PM   #32
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There's even more to it than tire diameter and where you are shifting. Noobs never look at the 1st gear ratio of their trans, how much of a drop off the 1-2 and 2-3 shift is, what sort of combo they are running etc... Like ppl putting the Termi T-56 into a stock block 2V with stock rear gears not even looking at the fact that 2.66 first and 3.27 rear in a stock 2V is going to=horrific experience leaving from a dead stop.
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Old 02-16-2014, 03:57 PM   #33
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My first gear is an insane 4.23 x 3.75 = 15.862, shifting first gear at 36mph @ 6986rpm. About 1 second into the run.
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Old 02-16-2014, 05:49 PM   #34
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Eff, that noise, put the 3.15s back in...
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Old 03-06-2014, 12:54 PM   #35
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Question... Can I use regular gear oil with friction modifier with brand new gears, or is there break in oil like from the factory for the engine?
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