3.73
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  • 2 Post By VaderWS6
Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 3.73 in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; So I got an 2006 CTS base and I enjoy but I wouldn't mind some more pep out of it. ...
  1. #1
    Acdcpsp is offline Cadillac Owners Fanatic
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    3.73

    So I got an 2006 CTS base and I enjoy but I wouldn't mind some more pep out of it. I got a Volant CAI already but I feel the engine has more than enough power. It just seems to me that the drive train really holds the engine back and was wondering if it be worth it replacing the 3.42 that I have in the rear with a 3.55 or 3.73? Would it make the car faster?

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  3. #2
    VaderWS6's Avatar
    VaderWS6 is offline Cadillac Owners Fanatic
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    Quote Originally Posted by Acdcpsp
    So I got an 2006 CTS base and I enjoy but I wouldn't mind some more pep out of it. I got a Volant CAI already but I feel the engine has more than enough power. It just seems to me that the drive train really holds the engine back and was wondering if it be worth it replacing the 3.42 that I have in the rear with a 3.55 or 3.73? Would it make the car faster?
    If you don't do a lot of interstate driving, you would probably enjoy 3.73's or 3.90's. That's as high as I'd go in an auto 5 speed. 6 speed go with 4.10's. Yes you'll be faster, and your mpg will be a lot less.

  4. #3
    DavidBoren's Avatar
    DavidBoren is offline Cadillac Owners Enthusiast
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    Re: 3.73

    Your top end will not increase. If anything it would decrease. You will be QUICKER... not faster. You will get to your top speed in less time, but your top speed will be less. Do not worry. Grabbing a CTS-V rear end with the 3.73 gears will not keep you from hitting your max fuel shut off/governor. In fact, you will get to your governed max speed sooner. But without a governor in place, your top speed will be less with lower gears.

  5. #4
    VaderWS6's Avatar
    VaderWS6 is offline Cadillac Owners Fanatic
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    I've had 4.10 gears in my 01 WS6 for 8 years, and would never look back. Stock had 3.42. I have a 6 speed though, so they're perfect. I lost around 1-3mpg cruising at 60mph, but can cruise in 6th in 45mph zones which increased my mileage a whole lot. Dropped .4 in the quarter mile as well. As far as top speed, nothing to worry about unless you're racing people to 130mph+, which you shouldn't be doing anyway. You'll go thru tires a little faster too, depending on your driving habits.
    CTSjones and DavidBoren like this.

  6. #5
    Acdcpsp is offline Cadillac Owners Fanatic
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    Re: 3.73

    I'm not really looking to be a race car. Just be a little quicker and I do drive on highways a lot so would this cause the engine to run a lot higher? It runs 2400rpm when doing 65mph now.

  7. #6
    VaderWS6's Avatar
    VaderWS6 is offline Cadillac Owners Fanatic
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    Quote Originally Posted by Acdcpsp
    I'm not really looking to be a race car. Just be a little quicker and I do drive on highways a lot so would this cause the engine to run a lot higher? It runs 2400rpm when doing 65mph now.
    You'll be running around 3000rpm at 60mph. 5 speed auto right? If you're doing a lot of highway driving, 3.42's are about the highest you wanna go unless you have a 6 speed.

  8. #7
    odthetruth's Avatar
    odthetruth is offline Moderator
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    Re: 3.73

    3.42s are what come stock if I'm not mistaken?

    [2006 CTS-V - "The Vee Baby Seamus"] - 372rwhp / 361rwtq
    Pacesetters | Off Road Adapters | Cutouts | Stock Airbox | Stock Catback
    BMR AWK | CS Diff Block | Short Shifter | UMI MM | Revshift TM

  9. #8
    Acdcpsp is offline Cadillac Owners Fanatic
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    Re: 3.73

    yeah open posi too

  10. #9
    CTSjones is offline Cadillac Owners Fanatic
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    Re: 3.73

    Quote Originally Posted by VaderWS6 View Post
    You'll be running around 3000rpm at 60mph. 5 speed auto right? If you're doing a lot of highway driving, 3.42's are about the highest you wanna go unless you have a 6 speed.
    He wrote he is turning 2400rpm at 65mph now with 3:42 gears, so if he swaps in a 3:73 rear end, his rpm would be 2617.

    At 60mph he will be turning 2416rpm.

    3:42 to 3:73 is approximately a 10% increase in gearing. I doubt if he would lose more than a mile or two per gallon in steady freeway driving.

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