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Thread: Diff Ratios

  1. 2nd November 2012, 08:21 PM #1
    Ancient Mariner
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    Diff Ratios

    G' day from North Queensland First post so please bare with me .Had
    Landrovers for 20 years but not for last 25 years.I have just bought a Defender
    300 tdi so need to be brought up to speed .With a 4bd1t a direct drive gearbox
    The current transfer case and 32 inch tyres what diff ratios would be most suitable out off either 2.75-1 3-1 3.25-1 or 3.5-1 no towing Jap 4x4 accepted Many thanks The A M
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  2. 2nd November 2012, 08:30 PM #2
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    Blknight.aus
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    3.54:1 just as it was from factory...

    did you have something specific else you wanted to do with it?
    Dave

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  3. 3rd November 2012, 09:39 AM #3
    Bush65
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    Dave answered you question correctly, but to provide additional info, the high range ratio in your 300Tdi transfer case is lower than what most would like behind a 4BD1 or 4BD1T.

    This is because a 300Tdi needs that ration due to low torque at low engine rpm. The torque curve for a 4BD1 or 4BD1T is much different, and best suits a cruise speed about 1800 to 2000 rpm, when the 300Tdi is only just starting to pull.
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  4. 4th November 2012, 07:05 AM #4
    Ancient Mariner
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    Diff Ratios

    Thanks for reply What you are saying is with current 300 tdi .I am doing
    100 kmh at 1800--2000 rpm in fourth gear no rev counter so will need to get out the calculator

    Thanks The AM
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  5. 4th November 2012, 11:14 AM #5
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    From Ashcrofts Calculator

    Standard 300 TDI Defender on 32 inch tyres

    Speed RPM in First Second Third Fourth and Fifth
    100 KPH 12034 6949 4554 3260 2510

    http://www.ashcroft-transmissions.co...atio_calc.html
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  6. 6th November 2012, 09:44 AM #6
    Bush65
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    Quote Originally Posted by Ancient Mariner View Post
    Thanks for reply What you are saying is with current 300 tdi .I am doing
    100 kmh at 1800--2000 rpm in fourth gear no rev counter so will need to get out the calculator

    Thanks The AM
    Sorry, I don't think I understood your first post correctly and thought you wanted to replace your 300Tdi with an Isuzu 4BD1.

    Re-reading your posts, I'm still not clear what you mean.

    Do you want to put a gearbox from a 4BD1 behind your 300Tdi?

    Is that gearbox an LT95 (4 speed, with direct drive top gear)?

    If so why (it seems a strange thing to want to do)?
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  7. 6th November 2012, 10:11 AM #7
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    Quote Originally Posted by Bush65 View Post
    Sorry, I don't think I understood your first post correctly and thought you wanted to replace your 300Tdi with an Isuzu 4BD1.

    Re-reading your posts, I'm still not clear what you mean.

    Do you want to put a gearbox from a 4BD1 behind your 300Tdi?

    Is that gearbox an LT95 (4 speed, with direct drive top gear)?

    If so why (it seems a strange thing to want to do)?
    And I thought it was just me
    That is why I haven't replied
    Wayne
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  8. 6th November 2012, 07:06 PM #8
    Ancient Mariner
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    Diff Ratios

    Sorry for the confusion Engine will be 4bt1t if i can locate Gearbox 5speed
    direct drive manual . Lt230t Transfer case 1.003 Gearing 32 inch tyres
    3.0 diffs

    The AM
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  9. 6th November 2012, 08:46 PM #9
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    The Isuzu MSA-5G 5 speed is 0.776:1 5th gear, so at 100km/h will give you ~1800 rpm with standard diffs (3.54).
    4th gear will be about ~2250 rpm at 100km/h.

    3.0 diffs would be too high.

    Steve
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  10. 6th November 2012, 09:00 PM #10
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    101RRS
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    Surely the diff ratios that is in a late Isuzu County that is fitted with an Isuzu and Lt85 and a Lt 230 will work.

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