Diff identification question

Unknown
Unknown
edited November -1 in HUDSON
Recently i was given a diff from a late 30s hudson.Stamped on the cover on the shaft side was what seems to be 4.11,which is the standard diff ratio.
So i thought i would check the diff on my 36T ute.The only stamped number i can see is either 5 or 6(bit hard to tell).My ute may well have the commercial 4.5 diff,but why would it not be stamped as such?
Also.is it possible to id diffs from the serial numbers on the inside?

Comments

  • Unknown
    Unknown
    count the teeth on the crown wheel & then divide it by the number of teeth on the pinion gear. That gives you your ratio.
  • bob ward
    bob ward Senior Contributor
    Skipster, to check ratio of the diff in the ute, jack up one back wheel, put a chalk mark on the tyre and the prop shaft. Turn the prop shaft by hand and count the number of turns of the prop shaft to one turn of the wheel. Being a ute, you may well have a 4.55 diff as you say.
  • Uncle Josh
    Uncle Josh Senior Contributor
    Ahem, if you turn 1 rear wheel, because you're driving thru the spider gears, you'll have to turn it 2 revs and count the prop shaft to get the ratio.
  • [Deleted User]
    [Deleted User]
    2 turns is correct. With one wheel off the ground, mark the tire and a mark on the ground. Now place a mark on the drive shaft with a mark on the housing, now have someone count the number of turns on the shaft while you make two revolutions with the wheel. You should have 4 turns plus the fraction, anywhere from one half to three quarters. Walt.
  • Huddy42
    Huddy42 Senior Contributor
    G'Day Skip,

    If you need a 4.1 Crown wheel & Pinion I think I have both in 6 stud and 8 stud to suit your ute here in Sydney.
  • Unknown
    Unknown
    Thanks ,will check out the one i have first. Hopefully it is 4.5,then i can swap it for 4.1.However the 3.5 ford diff option is intriguing.Thanks to all for the excellent info.
  • Geoff
    Geoff Senior Contributor
    Hey Skipster, good to meet up with you at Warnambool. Sorry I never got round to riding in your vahicle, to check out that vibration. Remember, to check diff ratio, jack up one side rear wheel, turn the wheel exactly two revolutions, and count the turns of the drive shaft.
    Geoff.
  • Unknown
    Unknown
    Cheers Geoff,thanks for coming to the meet.
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