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Thread: Rover Diff Ratio Id

  1. 22nd January 2005, 08:39 PM #1
    Hellspawn Guest

    Rover Diff Ratio Id

    I'm a bit confuzzled about what ratio mine has and it's never required diff repairs. Somehow I've snapped the thread and nut off the pinion shaft coming home on the rear diff (made noises on overrun and on inspection could almost pull the driving flange out of the seal).

    I managed to get home by removing the axles and rear driveshaft, engaging high four and drove off the front diff.

    The speedo has always showed 10 km under which makes me wonder whether the diffs have been swapped or not.

    How do I tell what the centres are so when I put it back they are still the same ratio ?
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  2. 22nd January 2005, 08:54 PM #2
    DEFENDERZOOK's Avatar
    DEFENDERZOOK
    DEFENDERZOOK is offline OldBushie
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    since they gotta come out count the teeth.
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  3. 22nd January 2005, 09:00 PM #3
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    LandyAndy
    LandyAndy is offline RoverLord Gold Subscriber
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    Hi Jay
    The codes on the diff housing are no good to you,the centres may have been swapped.
    Turn the wheel and count the no of turns the pinion does,if they are standard you should come up with 4.7 turns of the pinion to 1 wheel turn.My btothers 2A had 4.1 to 1,aparently a rover car ratio.He now has 3.54:1 rangie ratios.
    Goodluck
    Andrew
    DISCOVERY IS TO BE DISOWNED
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  4. 22nd January 2005, 09:07 PM #4
    DaveS3
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    Count the pinion teeth (PT), count the crownwheel teeth (CWT)

    Divide the CWT by the PT.

    That is your ratio

    Dave [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img]
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  5. 23rd January 2005, 04:43 PM #5
    Hellspawn Guest
    8O Ohh !! I was thinking it was something easy like...the ratio was stamped into the crown wheel.

    Probably get it on the axle stands tomorrow and stick the driving flange back in, turn the wheel and count the rotations.

    Thanks....
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  6. 25th January 2005, 05:56 PM #6
    Hellspawn Guest
    Swapped diffs today.......4.7 it is...... 8O looks to have been overhauled as there's very little wear on anything like bearings, pinion/crownwheel teeth..... even the shims look unscathed and considering the caning it got make the find all the more surprising. The oil was a good indication though clean as new stuff.........

    It's pity I can't at reasonable cost just replace the pinion and crown wheel.... could stick it back and it'd be schweet... $400 ex England though for those two.... [img]style_emoticons/<#EMO_DIR#>/sad.gif[/img]

    Anyway in the mean time we'll see how much trauma the replacement can tolerate.
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  7. 25th January 2005, 08:42 PM #7
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    Maggot4x4
    Maggot4x4 is offline Wizard
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    I have two for sale with lockers if interested.
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  8. 25th January 2005, 10:20 PM #8
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    LandyAndy
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    Go for it Jay
    Its time you destroyed another gearbox [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]

    Seriously,a shortie with a holden motor and twin lockers,Theres not many places it wont go BEASTY [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img] [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]

    Andrew
    DISCOVERY IS TO BE DISOWNED
    Midlife Crisis.Im going to get stuck into mine early and ENJOY it.
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  9. 26th January 2005, 11:26 AM #9
    Hellspawn Guest
    8O NOOOOO !! ...... Not the gearbox again !!! [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]

    You know.... I was thinking about lockers when I pulled this diff out... it'd be launch control at the traffic lights :wink:

    Okay you're right... could be another gearbox rebuild on the horizon. [img]style_emoticons/<#EMO_DIR#>/laugh.gif[/img]
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