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

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Old 04-03-2013, 12:45 PM   #1
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New rear end in but!!

Well my new 1LE rear end has been installed in my car. Only one problem, GM does not have the calibrations yet for the normal SS TR6060 for the speedometer. Should be out in about 3 months or so. So how many miles over or under am I at 35MPH and 65MPH?

Also my tach would still be the same right, so I know if I am redlining my engine?
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Old 04-03-2013, 02:58 PM   #2
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Originally Posted by Scott@Bjorn3D View Post
Well my new 1LE rear end has been installed in my car. Only one problem, GM does not have the calibrations yet for the normal SS TR6060 for the speedometer. Should be out in about 3 months or so. So how many miles over or under am I at 35MPH and 65MPH?

Also my tach would still be the same right, so I know if I am redlining my engine?
Ok figured it out with a online tool, about 5 under what the speedo says at low speeds and 8 under at when it says 65.
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Old 04-03-2013, 03:00 PM   #3
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I don't believe your trans has anything to do with what is showing up on your speedo. You changed your gears, so really the only thing you need to do is go to a tuner and have him calibrate the computer to reflect the new gears.
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Old 04-03-2013, 03:05 PM   #4
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I don't believe your trans has anything to do with what is showing up on your speedo. You changed your gears, so really the only thing you need to do is go to a tuner and have him calibrate the computer to reflect the new gears.
No the speedo has changed. Radar checked it with one of our patrol cars. The speedometer gets it info from the TCM which is in the transmission, when GM release the program for the stock SS TR6060 then it will have the gear change info in it from 3.45 to 3.91
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Old 04-03-2013, 03:23 PM   #5
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You can flash the computer via HP Tuners, EFI Live, or one of the hand held units that have the capability to modify the gear ratio to correct the speedo. Of course you have to own one of those or go to a tuner and have them flash the computer with the right gear ratio.
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Old 04-03-2013, 03:26 PM   #6
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Originally Posted by MA2010SS View Post
You can flash the computer via HP Tuners, EFI Live, or one of the hand held units that have the capability to modify the gear ratio to correct the speedo. Of course you have to own one of those or go to a tuner and have them flash the computer with the right gear ratio.
That would void the warranty. I will wait for GM Calc.
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Old 04-03-2013, 06:46 PM   #7
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Did not know the dealer was updating tunes because of gear/diff swaps, interesting. your speedo will be about 6 or so mph off and you will rack up mileage quicker with the speedo being off too.
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Old 04-03-2013, 07:40 PM   #8
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Do a handheld, and before you go to the dealer, swap it back to stock.
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Old 04-03-2013, 07:43 PM   #9
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Quote:
Originally Posted by MA2010SS View Post
Did not know the dealer was updating tunes because of gear/diff swaps, interesting. your speedo will be about 6 or so mph off and you will rack up mileage quicker with the speedo being off too.
The tune for the GM 1LE rear end is supposed to be certified for a normal SS in 2-3 months. Since we went around and around for the last couple of days since the rear end was put in the car hopefully it will be sooner than latter.
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Old 04-03-2013, 07:45 PM   #10
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Do a handheld, and before you go to the dealer, swap it back to stock.
They can still tell the ECM's been flashes.
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Old 04-03-2013, 07:52 PM   #11
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I'm out of ideas...lol
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Old 04-03-2013, 09:23 PM   #12
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So GM is releasing a calibration for a regular SS with 3.91 gears? Wouldn't that be a normal calibration for a 1LE? Couldn't you just go to a mod friendly dealer and have it flashed with a 1LE calibration. Seems to me like you might be getting a load offrom your current dealer.
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Old 04-04-2013, 04:46 AM   #13
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Quote:
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So GM is releasing a calibration for a regular SS with 3.91 gears? Wouldn't that be a normal calibration for a 1LE? Couldn't you just go to a mod friendly dealer and have it flashed with a 1LE calibration. Seems to me like you might be getting a load offrom your current dealer.
No this is not from the dealer, the 1LE transmission is different part than the SS transmission and the Calc's for each part has to meet EPA approval. That Calc is being tested now. Believe me it is not my dealers fault all. If you go to a normal dealer they can only load programming GM gives them and that programming is kept in a database for each VIN. Since I want to keep my drivetrain warranty that is why I will wait for the Calc. That is why also I bought the entire rear end from the dealer for a 5 year 100,000 mile warranty to not be voided.

Basically the part we bought will be up coming upgrades from GM, if you remember the 1LE announcement they said that older SS's can be upgraded to 1LE. We got approval to get the part and keep they warranty but no one new that Tach did not have the Calc yet.

I just wanted to know what would be off and that is why I posted. I have since found gear calculators on the net so I know what I go at what speeds now. None of this was posted to pick on my dealer or GM so please do not spin it like that.

And as far as calling dealer BS, well the dealer does not even want a dime from me for the work or the rear end until the Calc comes out and is installed on my car. I call that a good dealer in my book.
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Old 04-04-2013, 06:19 AM   #14
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Be careful how far you drive before retuning the speedo, because your odometer is off too.
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Old 04-04-2013, 07:50 AM   #15
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Be careful how far you drive before retuning the speedo, because your odometer is off too.
Very true, roughly 12% difference from 3.45 to 3.91 so there should be a 12% difference in mileage. 1000 miles read on the odometer will roughly be 880 miles real time driving until the correction is made in the tune.
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Old 04-04-2013, 08:41 AM   #16
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Please let us know when the 1LE factory tune/speedometer is approved for the SS.
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Old 04-04-2013, 04:34 PM   #17
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How much did that rear end cost?
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Old 04-04-2013, 04:49 PM   #18
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Installed 1900.00 Supposed to be a beefier rear end. It did look bigger than my stock.

Like it so far but still breaking it in. Second now feels like it has all the power first had. No more coming out of a turn and hitting the gas and going slow. Traction control lights all over the place not even flooring it. After tonight the rear end would of had 6 heat cycles with two overnight. Also has close to 120 miles on the gears so this weekend should be able to romp on her.
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Old 04-04-2013, 05:25 PM   #19
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It's identical to the stock SS rear, no difference in size, only gear ratio is different and not sure if they added the extra clutch to that differential. Every now and then the stock SS rear would just spin one tire due to the clutch pack being loose. People added 1 additional clutch to solve that problem.

Looks like time for you to give that rear some hell now
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Old 04-04-2013, 09:04 PM   #20
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Quote:
Originally Posted by Scott@Bjorn3D View Post
No this is not from the dealer, the 1LE transmission is different part than the SS transmission and the Calc's for each part has to meet EPA approval. That Calc is being tested now. Believe me it is not my dealers fault all. If you go to a normal dealer they can only load programming GM gives them and that programming is kept in a database for each VIN. Since I want to keep my drivetrain warranty that is why I will wait for the Calc. That is why also I bought the entire rear end from the dealer for a 5 year 100,000 mile warranty to not be voided.

Basically the part we bought will be up coming upgrades from GM, if you remember the 1LE announcement they said that older SS's can be upgraded to 1LE. We got approval to get the part and keep they warranty but no one new that Tach did not have the Calc yet.

I just wanted to know what would be off and that is why I posted. I have since found gear calculators on the net so I know what I go at what speeds now. None of this was posted to pick on my dealer or GM so please do not spin it like that.

And as far as calling dealer BS, well the dealer does not even want a dime from me for the work or the rear end until the Calc comes out and is installed on my car. I call that a good dealer in my book.
I see your point now. So, your saying that the dealer has to enter the VIN to access the calibration files in the data base, and then can only access the cal files associated with that VIN? I was not aware of the vehicle calibrations being linked to the VIN like that. Good information, thanks.
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Old 04-04-2013, 10:09 PM   #21
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I see your point now. So, your saying that the dealer has to enter the VIN to access the calibration files in the data base, and then can only access the cal files associated with that VIN? I was not aware of the vehicle calibrations being linked to the VIN like that. Good information, thanks.
No problem, this is why if something breaks in the drivetrain they have the dealer pull the ECM data, TCM data and BCM data to see if they where modified or flashed more times than the VIN's database say things should of been. That is how they can tell if a car has been tuned and warranty goes bye bye.
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Old 04-04-2013, 10:30 PM   #22
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Download a speedometer for iPhone or andriod and you will see your real speed on your phone.

And am I the only one who laughed at your post header? "New rear end in but"
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Old 04-05-2013, 06:27 AM   #23
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I used android app. You are dead on. +5@40, +8 @65.
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Old 04-05-2013, 06:56 AM   #24
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Quote:
Originally Posted by The Stig View Post
Be careful how far you drive before retuning the speedo, because your odometer is off too.
They are going to take on 125 miles for every 1000 the odometer says when we go in for the Calc. That will be added to extend my 36 month, 36K mile warranty. I will be way over 36K before during my 2nd year as my car is used for all my IT onsite trips.
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Old 04-05-2013, 07:05 AM   #25
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Subscribed. I intend to do the 3.91 upgrade eventually too so let us know when that update is available
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