Transmission/Engine Question.
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Cadillac STS Forum - 2005 through 2012 Discussion, Transmission/Engine Question. in Past Cadillac Vehicle Discussion; I have a 2006 Cadillac STS V8 N* now when im at high way speeds should my engine be running ...
  1. #1
    Jneedom14 is offline Cadillac Owners Member
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    Transmission/Engine Question.

    I have a 2006 Cadillac STS V8 N* now when im at high way speeds should my engine be running at about 2k RPM keep in mind im running lean so would that have anything to do with it and could it be the transmission not shifting into the appropriate gear that could cause the high rmp at highway speeds.

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    curtc's Avatar
    curtc is offline OCD - Obsessive Cadillac Disorder
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    That's about what mine runs at 70mph...
    Past Cadillac's

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    Jneedom14 is offline Cadillac Owners Member
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    Re: Transmission/Engine Question.

    Okay i just thought it was a little weird for it to be like that....And my intake manifold bolts are good so it must be something else causing me to run lean

    ----------

    and what kind of transmission is in our cars

  5. #4
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: Transmission/Engine Question.

    5L50E, it was a joint design with BMW...turns out diesel Range Rovers use the 5L40E, and the 50 is a beefed up version of the 40E.

    You think it revs high, now, huh? The 4th-5th solenoid in my transmission finally died, and 4th gear, while peppy, makes for about 2,800 RPM @ 65.

    It is quite responsive, however.

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    Jneedom14 is offline Cadillac Owners Member
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    Re: Transmission/Engine Question.

    How much to replace that solenoid.

  7. #6
    mckellyb is offline Cadillac Owners Enthusiast
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    Re: Transmission/Engine Question.

    The part is about $25. I'm going to do all four solenoids, three shift solenoids and the torque converter one, a filter, and rubber gasket for about $150, shipped. All shipped Priority Mail, 'cause I want to fix it this weekend.

    To have it done, I have no idea, as you have to pull the pan and the valve body. I may use this to put a final six quarts of fresh Dexron VI into it, too, and that's an extra $37, or so, from Amazon (with Prime, so no shipping...it's like cheating, but I Amazon enough for it to more than pay for itself).

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    Jneedom14 is offline Cadillac Owners Member
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    Re: Transmission/Engine Question.

    Okay my engine is at 2K at like 80-85 so i guess its normal. And i cant diagnose my lean condition.

  9. #8
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Transmission/Engine Question.

    Take it to a dealer and be done with your problem.

  10. #9
    Charles Warren's Avatar
    Charles Warren is offline Cadillac Owners Fanatic
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    Re: Transmission/Engine Question.

    2000k at 75 mph sounds normal and mount could be broke who knows, more info would be needed to tell you whats wrong

  11. #10
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Don't forget there's 3 different axle options which will determine cruising speed. 2.73 3.23 and 3.42

  12. #11
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Re: Transmission/Engine Question.

    I wish I could be at 2k RPM going 80-85MPH, I'm like 1800/1900 RPM at 65MPH and probably about 2400? at 80MPH. I'd have to go for a drive to find out again for sure though.
    Mine is GU5 (3.23:1) which I understand to be the only option for the AWD model.

  13. #12
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Quote Originally Posted by Ludacrisvp
    I wish I could be at 2k RPM going 80-85MPH, I'm like 1800/1900 RPM at 65MPH and probably about 2400? at 80MPH. I'd have to go for a drive to find out again for sure though.
    Mine is GU5 (3.23:1) which I understand to be the only option for the AWD model.
    Correct. Unless you swap to srx v6 diffs. Those had 373s. Of course that will net worse mpg over the 323.

  14. #13
    Ludacrisvp's Avatar
    Ludacrisvp is offline Cadillac Owners Connoisseur
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    Re: Transmission/Engine Question.

    Quote Originally Posted by 1BadCadSTS View Post
    Correct. Unless you swap to srx v6 diffs. Those had 373s. Of course that will net worse mpg over the 323.
    Which I assume was done to improve the acceleration characteristics of the V6 model?
    I have to wonder if one could swap out to using the LSD 2.73 diffs in lieu of the current 3? open diffs in the STS4

  15. #14
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    You could but you would need a tune for it and would have to do both front and rear diffs.

    Correct the v6 was given the 373 to help acceleration. I believe the also had 390s but I'm not sure. I just know my sisters 05 awd v6 sport has 373s.

  16. #15
    EChas3's Avatar
    EChas3 is offline Cadillac Owners Master
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    Re: Transmission/Engine Question.

    All the AWD's (V6 & V8) had 3.23 final gears, right? I know fleet & rental V8's in 2007 came with 2.73. 3.42 was the hottest final gearing and I thought it was standard on the RWD 1SG & optional on the 1SF. Although I don't know why, I had the idea that all the early (non-DI) V6's were 3.23. I'm sure some gear would have helped it off the line. Even later V6's were at a major disadvantage in torque, which is a better indicator of performance in a 2-ton touring sedan.

    My 2006 V8 AWD 5-speed turns 2K RPM doing 60MPH on 235/50R18's (virtually the same circumfrance as the OEM 255/45R18 rears.) To the extent I'm right, all AWD's would do so as well; maybe the early V6 RWD's, too. My wife's 2007 V8 RWD 6-speed has the 2.73 and 2K RPM has us cruising at 80 MPH on the stock wheels & Summer Conti DW 235/50R17 tires.

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