some questions about the XLR-V drivetrain etc.
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Cadillac XLR-V Series Forum Discussion, some questions about the XLR-V drivetrain etc. in Cadillac V-Series Forums; I was doing some searching and saw a member saying the rear is inferior Are the axles ok?? Is it ...
  1. #1
    Greg O.'s Avatar
    Greg O. is offline Cadillac Owners Member
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    some questions about the XLR-V drivetrain etc.

    I was doing some searching and saw a member saying the rear is inferior Are the axles ok?? Is it the same as the c5 or c6 vette...And the Automatic...What part or model # does it go by, and is that tranny and converter considered good for the stock XLR? I own an 06 GEN1 CTS-V, and GM put in garbage rears and axles.. Why can't GM put in a rearend that will support the hp and weight of the car...poor engineering IMO.......With having bad knees I bought an XLRV, and just want to know the parts especially the weak ones if there are any...I love an automatic, especially the rachet shifter in the XLR's
    . thanks GREG O.
    ps: Is a 255/19 the widest we can use. I looked and I measured the rim has about 1 1/4" before rim hits the upper fenderwell The 255's stick out probably about 1/2"...past the the rim which is the sectional width...I have some vette rims that I will put on this weekend to test...

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  3. #2
    TimmyC is offline Cadillac Owners Connoisseur
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    Re: some questions about the XLR-V drivetrain etc.

    The trans is a 6L80E from the Corvette and the rear axle is also C6 Corvette.

    Bigger tires will fit but I don't know what the limit is.

  4. #3
    GizmoQ's Avatar
    GizmoQ is offline The Last Good Gremlin
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    Re: some questions about the XLR-V drivetrain etc.

    I'm running 18" wheels so you'll have to do the math for a comparable 19/20" tire, but I've gone as far as 285/35/18. There a guy in Cali on another forum that had HRE make him custom wheels:
    Custom Front & rear:

    19x10, Rims 8.5" inner w/1.5" outer PH (*?) ET 57
    20x10, Rims 8.0" inner w/2.0" outer PH 1.3" ET 48

    The tires sizes I've decided to use are P-Zero run flats; 275/35/19 (f) and 275/35/20 (r). 19x10 (f) and 20x10 (r)
    Another guy in Houston is running 285/30/20(rear)
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 501rwhp and 486TQ at 6000RPM so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 165.6MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  5. #4
    Greg O.'s Avatar
    Greg O. is offline Cadillac Owners Member
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    Re: some questions about the XLR-V drivetrain etc.

    Quote Originally Posted by TimmyC View Post
    The trans is a 6L80E from the Corvette and the rear axle is also C6 Corvette.
    Yes, i was so excited when I searched that we do have the 6l80E..do u think the diff is a direct bolt on job..doubt if I were to need one..
    Bigger tires will fit but I don't know what the limit is.
    Gismo, were they 18"x8 1/2? IF u try to put too much meat on a narrow rim the car will easily loose control during eratic driving [ or racing type conditions] How did the 285's handle? thanks GREG O.
    Quote Originally Posted by GizmoQ View Post
    I'm running 18" wheels so you'll have to do the math for a comparable 19/20" tire, but I've gone as far as 285/35/18. There a guy in Cali on another forum that had HRE make him custom wheels:


    Another guy in Houston is running 285/30/20(rear)

  6. #5
    GizmoQ's Avatar
    GizmoQ is offline The Last Good Gremlin
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    Re: some questions about the XLR-V drivetrain etc.

    Quote Originally Posted by Greg O. View Post
    Gismo, were they 18"x8 1/2? IF u try to put too much meat on a narrow rim the car will easily loose control during eratic driving [ or racing type conditions] How did the 285's handle? thanks GREG O.
    The 285s were on 9.5 width rims and I hated them. They looked great, but were shorter than the front tires which made the profile look odd. As you mentioned, any hooning of the car was sloppy and it didn't take long to start blistering the tread.
    Snake Bit Super Chilled Black Raven 2006 Cadillac XLR-V aka Elwood (Jake's brother)
    Verified 501rwhp and 486TQ at 6000RPM so far...final goal 575/550

    ELWOOD - "Corvette in a Tuxedo ... with a Jet Pack"



    2013 St Louis Region SCCA Solo SSM Class Champion
    Texas Mile Record Holder: Street Legal XLR @ 165.6MPH
    ECTA LSR Record Holder: 4.2-5.0L Blown Gas Modified Sports Car

  7. #6
    Dr. Design is offline Cadillac Owners Connoisseur
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    Re: some questions about the XLR-V drivetrain etc.

    285 is about the widest on the stock body. If you go wide body we can go as large as 335.

    Thank you,

    Dr. Design
    D3 Cadillac

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