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Thread: Diff gearing

  1. 19th October 2005, 09:04 PM #1
    chriso
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    Diff gearing

    Hello
    Anyone out there run standard 3.54 diffs with a Lt 95 and 35 inch tyres? Been told by a few people I will need 4.11 but looking at gearbox/transfer ratios I'm wondering if I will. The people telling me I will need to change run either ZF's or the Chrysler 3 speeds and a quick look at the low range ratios of all boxes concerned tells me my gearing is pretty damn low as is.
    eg. Lt 95 1st 47.83
    2nd 28.78

    Zf 1st 28.50
    2nd17.00

    Chrysler 1st 28.79
    2nd 17.04

    Lt 77 1st 39.02
    25.04
    Now I'm not to sure if these numbers mean squat so any imput would be greatly appreciated.

    Regards

    Chris
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  2. 19th October 2005, 09:19 PM #2
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    Slunnie
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    How is this all with the hi/lo range ratios?
    Cheers
    Slunnie


    ~ Discovery II Td5 ~ Discovery 3dr V8 ~ Series IIa 6cyl ute ~ Series II V8 ute ~
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  3. 19th October 2005, 09:46 PM #3
    chriso
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    These are the low range transfer ratios.
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  4. 20th October 2005, 08:19 AM #4
    PhilipA
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    Chriso,
    The major problem with big tyres is not the low range but High range.You are adding about 25% gearing with 35 inch tyres, and if it is a 3.5 it will have trouble climbing anything but a veeery gentle slope in top.
    I had a Fairey overdrive and 31 inch tyres and I became very good at changing gear. If you have a 4.4 or 4.6 then it will handle the gearing better.

    You will reduce low range by 25% also which will bring you back to about 35:1 equivalent, ie like an LT77.
    In practical terms I never used 1st low for climbing as it was too low and just caused wheelspin, but if you are into rockcrawling it may be an issue.

    So horses for courses. If I were fitting 35 inch tyres and wanted to do rockcrawling stuff, I would fit 4.11 diffs, but for general track work you will be OK. Getting there will be a pain though.
    Regards Philip A
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  5. 20th October 2005, 07:49 PM #5
    chriso
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    Phillip, getting there was already a pain [img]style_emoticons/<#EMO_DIR#>/biggrin.gif[/img] The Rangie has become my weekend mud toy (damn they drink fuel) and the blokes I go out with run a minimum 36 inchs, mostly TSL's , and there not to keen on high speed motoring on those things. Thanks for the imput

    Regards

    Chris
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  6. 20th October 2005, 09:23 PM #6
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    Maggot4x4
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    You may actually find it drives better on the road. It will be slower off the mark, but most places you use 1 more gear so you tend to stay in the torque band of the motor. You will also gain fuel economy on the road due to the taller gearing.

    I ran 35's on 3.54's until I put my Nissans in, the are stock with 4.1. I actually think it drove better on the road with 3.54 as I could actually use first gear for a fair bit longer.

    Mind you, my rangie as a 4BD1 in it.
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