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Thread: 373 gear ratio rear end $2500 installed.

  1. #16
    rayjoedef is offline Cadillac Owners Fanatic
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    Re: 373 gear ratio rear end $2500 installed.

    I am upgrading 2011 v-coupe.....cam, heads, headers, upper/lower pulley, plugs....the whole 9 yards. Auto with 323 rearend....Does anyone think a 373 rear would give me more torque feeling without compromising engine life and highway driving? The car has overdrive. Any ideas if torque converter would be helpful? thanks for the help.


  2. #17
    baabootoo's Avatar
    baabootoo is offline Cadillac Owners Connoisseur
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    Re: 373 gear ratio rear end $2500 installed.

    First will be like a granny gear though. The auto has a lower 1st ratio to compensate for the difference.

  3. #18
    cts-v ls6 is offline Cadillac Owners Fanatic
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    Re: 373 gear ratio rear end $2500 installed.

    Pick a Part in Cleveland has complete rear end assemblies (brakes and all) in both ratios for around $1800. I think they're having a Christmas sale as well.

    Jack

  4. #19
    garfin's Avatar
    garfin is offline Cadillac Owners Connoisseur
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    Re: 373 gear ratio rear end $2500 installed.

    Quote Originally Posted by rayjoedef View Post
    I am upgrading 2011 v-coupe.....cam, heads, headers, upper/lower pulley, plugs....the whole 9 yards. Auto with 323 rearend....Does anyone think a 373 rear would give me more torque feeling without compromising engine life and highway driving? The car has overdrive. Any ideas if torque converter would be helpful? thanks for the help.
    If my memory serves correct, most who put 3.73s in their A4 LS1/LT1 Camaros and Firebirds weren't all that happy with their decision based on excess noise at cruising speeds and reduced gas mileage. Most of those A4s came with 3.23s (although some had 2.73s) and although 4th was an overdrive (0.70:1), most A4 people were happy going from 3.23s to the 3.42s, which was the stock gearing in the M6 (which had a more extreme 6th gear overdrive ratio of 0.50:1). Even with 4.10s, the manual cars would still cruise at 70 mph at around 2200 rpm and deliver around 27 mpg!
    My gut feeling about installing 3.73s in your modified V is that it is too much gear and would present a real problem getting traction and putting the torque to the ground - especially with that numerically high 1st gear!

    Best regards,

    Elie

  5. #20
    Crystal Red CTS-V is offline Cadillac Owners Fanatic
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    Re: 373 gear ratio rear end $2500 installed.

    The 6th gear ratio in my Z06 is 0.5 giving a 1500 rpm cruising speed at 70. Wish I had that in the V!

  6. #21
    Stillborn's Avatar
    Stillborn is offline Cadillac Owners Enthusiast
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    Re: 373 gear ratio rear end $2500 installed.

    if you thought it was bad on gas now.....

  7. #22
    Torxila's Avatar
    Torxila is offline Cadillac Owners Enthusiast
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    Re: 373 gear ratio rear end $2500 installed.

    Quote Originally Posted by Crystal Red CTS-V View Post
    The 6th gear ratio in my Z06 is 0.5 giving a 1500 rpm cruising speed at 70. Wish I had that in the V!
    CR V
    Just replace your 5th&6th ratios

    http://www.cadillacowners.com/forum/show...n-my-6MT-coupe

    George

  8. #23
    sldrmedic is offline Cadillac Owners Member
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    Re: 373 gear ratio rear end $2500 installed.

    I realize this is an old post but was wondering if this would be an easy swap for my 03 cts? Is there any reason this would cause me issues of any kind and is it as easy as topping my diff and replacing it with this 373?

    ----------

    meant to say "...DROPPING my diff and replacing..."

  9. #24
    AAIIIC's Avatar
    AAIIIC is online now Super Moderator
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    Re: 373 gear ratio rear end $2500 installed.

    Quote Originally Posted by sldrmedic View Post
    I realize this is an old post but was wondering if this would be an easy swap for my 03 cts? Is there any reason this would cause me issues of any kind and is it as easy as topping my diff and replacing it with this 373?
    This diff isn't compatible with your car. Wrong generation of CTS.

    Quote Originally Posted by sldrmedic View Post
    meant to say "...DROPPING my diff and replacing..."
    So click the "Edit Post" button and fix it rather than "Reply".
    '05 Stealth Grey CTS-V, 19x8.5/10" CCW T140s with Toyo Proxes T1 Sports (summer), black Team Dynamics ProRace 1.2 wheels with 275/35-18 R-compounds (track), Hyperblack Rota Torques (winter), KW Variant3s, V2 front brakes, Hotchkis rear sway bar, EPS cam, TEA-ported 243 heads, FAST92 intake w/LS2 TB, JBA Camaro/G8 1-3/4" shorty headers w/JBA cat pipes, Corsa exhaust, UUC motor and tranny mounts, UUC shifter, MAPerformance trailing arms, Specter cradle bushings, etc...

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