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2009-2014 Cadillac CTS-V General Discussion Discussion, On the fence again on what transmission in Cadillac CTS-V Series Forum - 2009-2014; One word - Autobahn. :-) Of course most of the locals over there are governed to 155 or so. 175 ...
  1. #31
    HiTechRV's Avatar
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    Re: On the fence again on what transmission

    One word - Autobahn. :-) Of course most of the locals over there are governed to 155 or so. 175 would be plenty to embarass them.

    I'd actually go the other way - a 4.11 or steeper gear custom built to get more acceleration, sacraficing some top speed and MPG. I'd really have no need for it to top out above 140.

  2. #32
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    Re: On the fence again on what transmission

    Quote Originally Posted by Cadillac Tony View Post
    They both have a 3.73 gears in the diff
    Is there a typo on the official V website? It shows final drive ratios as:

    TR6060 manual = 3.73:1
    6L90E automatic = 3.23:1

    Where's my Cadillac trinket FTW?

  3. #33
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    Re: On the fence again on what transmission

    Quote Originally Posted by StealthV View Post
    Is there a typo on the official V website? It shows final drive ratios as:

    TR6060 manual = 3.73:1
    6L90E automatic = 3.23:1

    Where's my Cadillac trinket FTW?
    Beat me to it...

  4. #34
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    Re: On the fence again on what transmission

    Blarg- that's what I get for popping in and posting too quickly in-between customers- the Auto has a 3.23, not a 3.73.
    Tony Pagano
    Sales Manager
    Plaza Cadillac
    Leesburg, FL
    (352)787-1323

    www.cadillactony.com



    The views and opinions of this poster are solely his own and do not represent those of Plaza Cadillac

  5. #35
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    Re: On the fence again on what transmission

    so then comes my question again..what if we put in a 3.73 and add hp..lol

  6. #36
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    Re: On the fence again on what transmission

    A 3.73:1 final drive ratio in a automatic V would be a very nice performance upgrade, with the fuel economy trade-off of course, that doesn't push the envelope of craziness in the mod world as it is a proven factory piece. The ratio in changing the rear ratio (ha!) provides a 15% gain in torque to the rear wheels.

    The 3.73:1 gear swap would be a stealthy mod except for the need to reprogram the transmission to send the right MPH signal to the speedometer. There's that ol' flashing software and screwing with the warranty thing again.

    Hmm...Just thought of a way to make the speedo correct without big brother knowing.

  7. #37
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    Re: On the fence again on what transmission

    Now if somone would only make a nice 4.10:1 gear set set for the manual V.

    Damn the MPG, it's all about torque multiplication!

  8. #38
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    Re: On the fence again on what transmission

    Quote Originally Posted by StealthV View Post
    Now if somone would only make a nice 4.10:1 gear set set for the manual V.

    Damn the MPG, it's all about torque multiplication!
    So you have chosen the manual, final answer......? Using all this feedback to confirm my own choice, hence the thread question. THIS CAR is going to kick azz.

  9. #39
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    Re: On the fence again on what transmission

    Quote Originally Posted by StealthV View Post
    A 3.73:1 final drive ratio in a automatic V would be a very nice performance upgrade, with the fuel economy trade-off of course, that doesn't push the envelope of craziness in the mod world as it is a proven factory piece. The ratio in changing the rear ratio (ha!) provides a 15% gain in torque to the rear wheels.

    The 3.73:1 gear swap would be a stealthy mod except for the need to reprogram the transmission to send the right MPH signal to the speedometer. There's that ol' flashing software and screwing with the warranty thing again.

    Hmm...Just thought of a way to make the speedo correct without big brother knowing.
    I hope you have some good software for the car ; )

  10. #40
    Jpjr is offline Cadillac Owners Enthusiast
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    Re: On the fence again on what transmission

    Quote Originally Posted by StealthV View Post
    A 3.73:1 final drive ratio in a automatic V would be a very nice performance upgrade, with the fuel economy trade-off of course, that doesn't push the envelope of craziness in the mod world as it is a proven factory piece. The ratio in changing the rear ratio (ha!) provides a 15% gain in torque to the rear wheels.

    The 3.73:1 gear swap would be a stealthy mod except for the need to reprogram the transmission to send the right MPH signal to the speedometer. There's that ol' flashing software and screwing with the warranty thing again.

    Hmm...Just thought of a way to make the speedo correct without big brother knowing.

    Change the diff gears and resize your rear wheels?

  11. #41
    Silverspeed is offline Cadillac Owners Member
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    Re: On the fence again on what transmission

    Quote Originally Posted by StealthV View Post
    A 3.73:1 final drive ratio in a automatic V would be a very nice performance upgrade, with the fuel economy trade-off of course, that doesn't push the envelope of craziness in the mod world as it is a proven factory piece. The ratio in changing the rear ratio (ha!) provides a 15% gain in torque to the rear wheels.

    The 3.73:1 gear swap would be a stealthy mod except for the need to reprogram the transmission to send the right MPH signal to the speedometer. There's that ol' flashing software and screwing with the warranty thing again.

    Hmm...Just thought of a way to make the speedo correct without big brother knowing.
    I think a 3.73 would be way too much gear. The transmission has the exact same ratio's as the A6 in the C6 Vette, and in the LS3 cars a 2.73 is considered a performance factory option over the base 2.56. Most of the aftermarket guys go with 3.15's and 3.42's are the most anyone has ever put in an A6 equipped vette( at least that I've read about). A 3.23 with the standard trans gear ratios is already a very strongly geared car. I was honestly shocked when I saw the trans was the same as the C6(ratios) and they were putting 3.23's out back. I would imagine that 3.73's and 550ft./lbs with those trans ratios would make 1st gear useless. Probably much of second as well. Don't have time to do the numbers but I'd be willing to bet that 3.73's in an A6 would be the equvilent of 4.90's in the manual when it comes to final drive ratio. Maybe someone can run the numbers?

  12. #42
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    Re: On the fence again on what transmission

    Practical or smart should never factor into modifying a V.

    Is it time to go home yet?

  13. #43
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    Re: On the fence again on what transmission

    If you resized the wheels and tires so that the speedo were right, you would have no performance increase. Now you might be able to lie to the ECU through a tech 2 about tire diameter....

  14. #44
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    Re: On the fence again on what transmission

    FYI for first gear, running 3.73's in the A6 gives a overall ratio of 14.99. To have the same overall ratio in the MN6 you would need a 5.64 gear set. lol

    Factory stock the A6 car is already has stronger overall gearing in the first three gears than the MN6, especially in first and second, with the MN6 surpassing it in fourth. I would venture to say from a dig the A6 car will pull away from the MN6 only to get caught later in the run if driven properly. From a highway roll at 80+ the MN6 should walk the A6 since the very slight gearing advantage in 3rd won't overcome it's rwhp disadvantage.

    Bench racing at it's best.

    Overall gear ratios by trans type:

    A6 with 3.23..............MN6 with 3.73.......A6 with 3.73............MN6 with 4.10

    1: 12.98...................1. 9.92................1. 14.99..................1. 10.91
    2: 7.62....................2. 6.64................2. 8.80....................2. 7.30
    3: 4.94....................3. 4.85................3. 5.71....................3. 5.33
    4: 3.71....................4. 3.73................4. 4.29....................4. 4.10

  15. #45
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    Re: On the fence again on what transmission

    Quote Originally Posted by Some guy posing as StealthV View Post
    Practical or smart should never factor into modifying a V.
    Blitzer!! Where you been, man? And... when did you learn to type?

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