WTB 504/505 Diff
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  1. #1
    Fellow Frogger! PCOATES505's Avatar
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    Default WTB 504/505 Diff

    Hi All,
    Thinking about a different diff ratio for the rally car, wondering if anyone has a 3.89:1 diff they want to part with, at a reasonable price.

    Regards Pete

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    I am gunna get another 403 on the road........one day

  2. #2
    Gone Fishin' Ray Bell's Avatar
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    Several... also 3.78 and maybe a 4.11...

  3. #3
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    Quote Originally Posted by PCOATES505
    Hi All,
    Thinking about a different diff ratio for the rally car, wondering if anyone has a 3.89:1 diff they want to part with, at a reasonable price.

    Regards Pete
    I have a good early 3.89
    Graham

  4. #4
    Gone Fishin' Ray Bell's Avatar
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    Can I just ask what ratio you have now?

    In reality, the difference between a 4.11 (which I think is the standard 505 diff) and the 3.89 is a mere 2.2mph at 40mph. In other words, instead of doing 42.2mph, you'll be doing 40mph at the same revs.

    Graham, do you think you can notice the difference (in rally use...) with that small a change?

  5. #5
    Fellow Frogger! PCOATES505's Avatar
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    We are currently running a 3.78 and want to up the revs a bit without losing much speed in first gear, so the plan is to try a 3.89 and see if this gives us the flexability we want, which is to be able to run at speed in 2nd gear and not be constantly changing between 2nd and 3rd.

    Pete

    I am gunna get another 403 on the road........one day

  6. #6
    Gone Fishin' Ray Bell's Avatar
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    Honestly, I don't think you'd notice the difference...

    that's much less difference than I described in my last post, only half as much. Do you think you could pick the difference of one mile per hour at 40mph?

    I think you want a 4.11. It's still only 3.3 mph at that speed, but it's probably discernable.

  7. #7
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    Quote Originally Posted by Ray Bell
    Honestly, I don't think you'd notice the difference...

    that's much less difference than I described in my last post, only half as much. Do you think you could pick the difference of one mile per hour at 40mph?

    I think you want a 4.11. It's still only 3.3 mph at that speed, but it's probably discernable.
    Surprisingly you can notice the difference but the 4.11 is probably the one you need. I have one of these too!
    Graham

  8. #8
    Fellow Frogger! PCOATES505's Avatar
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    We found a 3.89 in the back of Lyn's shed, and fitted it yesterday,
    BIG difference. Thanks anyway for the offers.
    Regards Pete

    I am gunna get another 403 on the road........one day

  9. #9
    Fellow Frogger! Janek's Avatar
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    ive got a diff out of an '80s 504... no idea what ratio, but is just sitting in my garage...

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