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Thread: diff ratio

  1. 19th July 2012, 10:10 AM #11
    Tusker's Avatar
    Tusker
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    Quote Originally Posted by uninformed View Post
    Is 0.01 difference between front and rear R+P enough to do damage If so, what is getting damaged?
    Wouldn't have thought so, but the crown wheel teeth were being torn out at the root. Three times. This was 4.10s in a P38a diff. Haven't checked, I don't know whether 4.11s are available for the P38a.

    You'd think there'd be more variation in the tyres than .01, or windup in the propshafts, but there was someone else complaining at the time on Outer Limits about the same mismatch & diffs breaking.

    I think it's a combination of the inherently smaller pinion with a 4.10, the too-short pinion length in the P38A that induces pinion movement, and CW flex even with a locker bolted to it. It's just a rubbish design.

    Regards
    Max P
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  2. 19th July 2012, 02:44 PM #12
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    Quote Originally Posted by Tusker View Post
    Wouldn't have thought so, but the crown wheel teeth were being torn out at the root. Three times. This was 4.10s in a P38a diff. Haven't checked, I don't know whether 4.11s are available for the P38a.

    You'd think there'd be more variation in the tyres than .01, or windup in the propshafts, but there was someone else complaining at the time on Outer Limits about the same mismatch & diffs breaking.

    I think it's a combination of the inherently smaller pinion with a 4.10, the too-short pinion length in the P38A that induces pinion movement, and CW flex even with a locker bolted to it. It's just a rubbish design.

    Regards
    Max P
    And just to throw another spanner in the works,I have a 4.12 Ashcroft R&P in the front of my Defender,and a 4.11 Dana 60 R&P in the rear Salisbury.So not only do I have a miss match,but no problems with ripping teeth off
    So I guess it is just the the poor design of the P38DiffAs the difference is miniscule.
    Wayne
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  3. 12th November 2015, 09:23 PM #13
    paulak
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    Gday,
    If the standard diff ratio is 3.54 on most Landy's.
    Would this include Perentie's?
    I have a busted front diff/axle in my Perentie.
    I was hoping to swap out the entire front diff from my 93 Defender.
    Easy job?
    Thanks.
    Paul.
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