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  1. #1
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    Default TD5 Transfer box ratio

    Needing some info as I have noticed that my 2004 defender 110 TD5's transfer box ratio is given as 1,667:1 according to the sticker on the box.
    Interestingly going by the Ashcroft ratio calculator on the web it appears that the TD5 comes standard with a 1,441 ration box and not a 1,667 as per mine.
    Would love to reduce the engine refs for a more comfortable cruising though as I can get hold of a D2 1,221 ratio box for a straight swap, which actually started the idea.
    Having the issue with the sticker indicating 1,667 ratio, could I please ask other Defender 110 TD5 owners to comfirm the engine revolutions at say 100kmh and 120kmh in 5th gear. Mine runs at a little over 2500rpm @100kmh and at 120kmh approximately 3100rpm.

    Has a conversion like this been attempted before and if so, what is the verdict?

    Would appreciate any feedback.

    Thanks,

    Wessel

  2. #2
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    Default

    Both my td5 are 120km/h @ about 3000rpm. Yours might be 120km/h @ 3100rpm due to transfer ratio or tire size? Im running 235 85 R16. Will have a look at the ratio on the transfer case tomorrow. If I remember correctly LRWit is running a disco transfer case in his defender, ask him.

  3. #3
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    Default

    Thanks for the response. I am running 265/75/16 Bridgestones. Might be the difference in tyre size only as according to the Ashcroft ratio calculator the 1,667 ratio should run 3986rpm @ 65mph (104kmh) in 4th, being the direct drive. I checked yesterday and my Defender runs approx. 3500rpm @ 105kmh in 4th.
    I am now fairly confident that the indication of 1,667 ratio on my box is wrong and I am actually running a 1,41 ratio box
    Thanks again and I will try and contact LRWit for more info.

  4. #4
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    Default

    Tyre size does not affect the relationship between speedo and rev counter. It only impacts true speed (GPS) vs revs

    Yes, LRWit has a Disco TC.
    Rob
    Defender 90 pickup. Lexus V8, Spitronics, 33" KL71, beadlocks, +2" Terrafirma, ATB's, 3.75 CW&P, 1.21 TC.
    Disco 2 ES TD5. Custom map, V8 TC
    Disco 1 ES 300TDi
    Series IIA 88" pickup
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  5. #5
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    Default

    I would like to post the outcome of my query above in that the plunge was taken and the transfer box swaps were successfully done.
    My Defender now sits with a 1.221 ratio transfer box ex 1998 Disco 1 Auto and found the end result very satisfying. Engine revolutions at a comfortable 110 km/h is approx 2500rpm and it does not sound like it wants to take off and starts flying anymore. Sound levels is also much quieter and I can listen to my favorite Boere musiek again.
    Have not had the opportunity to travel a longish distance as yet but hope to soon. Fuel consumption will be measured over a period and will report back for whoever wants to know. Planning a three week tour of the Northern Natal, Mpumalanga and Swaziland Nature reserves next month using back roads as much as possible.
    Looking forward to it and counting the days/hours.

    Thank you to LRwit for information and re-assurance of the feasibility of the conversion.

  6. #6
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    Default

    Awesome!!

    WE married up my Td5 to a D2 V8. I am also very very happy with the outcome!!

    Have you had her offroad yet?? would love to know what she feels like in 1st and 2nd low, and still have to take her of the beaten track!!
    My wife is simple, in a complicated way

  7. #7
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    Default

    Quote Originally Posted by Benson View Post
    Awesome!!

    WE married up my Td5 to a D2 V8. I am also very very happy with the outcome!!

    Have you had her offroad yet?? would love to know what she feels like in 1st and 2nd low, and still have to take her of the beaten track!!
    As far as I know the low range ratio stays the same.. It's onlyu high range that is different
    Range Rover Big Body 5.0 V8 Supercharged
    Land Rover Defender 110 CSW Puma
    Land Rover Defender 110 V8 Game viewer
    Land Rover Defender 100 PU V8
    Land Rover Freelander II SD4
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  8. #8
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    Yes, low range stays the same so offroad in low range will not be different. Because high range is now lower means more comfortable high speed (110 kmh !!!!!) cruising, also 120 kmp if you want to albeit slightly less power for uphill driving. Is not an issue because of the other advantages such as less engine noise and expected extended engine life.

  9. #9
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    Default

    to the best of knowledge it was only the 2.8 BM defender that ran the 1.6:1 ratio TC

    Land Rovers never die, they simply become organ donors!

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