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200 Tdi Conv. Which Transfer Box?!


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After some advice-I'm in the process of doing a 200 Tdi conversion on my 1986 90. I have the option of using the standard 90 transfer box or one from the donor Disco 1!? I believe the Disco trans box is higher ratio.

I want the vehicle to be a good all rounder i.e Good road speed but still low enough geared for the off roading!?

Any ideas as to which would be most suitable??

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What size tyres are you running?

I am going to put a defender (1.4) transfer box on my disco when I go up to 235/85 16 tyres (~same diameter as 750-16s) so if I were you I would stick with the 1.4 t-box

Mark

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I believe the Disco trans box is higher ratio.

I want the vehicle to be a good all rounder i.e Good road speed but still low enough geared for the off roading!?

Any ideas as to which would be most suitable??

If you want it higher geared then you need to fit a LOWER ratio like the Discovery box. :o

Don't worry even the technical wrighters don't know the difference between a high ratio and high gearing :unsure:

mike

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If you want it higher geared then you need to fit a LOWER ratio like the Discovery box. :o

Don't worry even the technical wrighters don't know the difference between a high ratio and high gearing :unsure:

mike

I have a disco 200tdi lightweight hybrid running the disco T box (standard fuel pump setup) find

I need to slip the cluth alot with fedima 36's just pulling away from lights etc, would think a 90 T box would be better for daily use, should be fitting a 110 T box soon so hopefully that'll improve use around town

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Unmodified 300TDi 90 on 265/75x16's fitted with Disco transfer-box. Fantastic conversion and I can't recomend it highly enough.

I always advise people to try before fitting and am willing for anyone to have a drive in mine if they are local but in my opinion, when commuting, motorways, headwinds, hills, towing & off-road etc it is much better than the standard gearing.

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Unmodified 300TDi 90 on 265/75x16's fitted with Disco transfer-box. Fantastic conversion and I can't recomend it highly enough.

I always advise people to try before fitting and am willing for anyone to have a drive in mine if they are local but in my opinion, when commuting, motorways, headwinds, hills, towing & off-road etc it is much better than the standard gearing.

It matters not from where the transfer box came from. Disco's can have the same ratio other models

If you are lucky a sticker next to the PTO outup plate will asdivse of the box ratio

List of Serial numbers and corresponding Ratios

All stock LT 230"s have a low ratio of 3.321, the following list refers to the high range ratio.

12D = 1.667 LT 230R

13D = 1.410 LT 230R

14D = 1.003 LT 230R

15D = 1.192 LT 230R

20D = 1.667 (2.5 N/A 110),

22D = 1.410 (all 4Cyl 90/110 bar above),

25D = 1.410 (V8 110 LT 85),

26D = 1.003 (RR Classic 3 speed auto),

27D = 1.192 (early RR Classic),

28D = 1.222 (RR and Disco I),

29D = 1.192 (V8 90 LT 85),

32D = 1.222

34D = 1.410 (2.0 Disco I),

36D = 1.211

38D = 1.211

40D = 1.211 (NAS/Japan 90&Disco),

41D = 1.211 (Disco II, diff lock stud),

42D = 1.211 (Disco II, diff lock stud),

43D = 1.410 (90/110 TD5),

57D = 1.410 (90/110 TD5),

61D = 1.211,

62D = 1.211,

68D = 1.211,

69D = 1.211,

70D = 1.211 (Disco II, no diff lock),

LT 230 Transfer case comparisons

1.003 > 1.222 = 17.92% Drop

1.003 > 1.410 = 28.86% Drop

1.003 > 1.667 = 39.83% Drop

1.222 > 1.003 = 21.80% Raise

1.222 > 1.410 = 13.33% Drop

1.222 > 1.667 = 26.70% Drop

1.410 > 1.003 = 40.57% Raise

1.410 > 1.222 = 15.38% Raise

1.410 > 1.667 = 15.41% Drop

1.667 > 1.003 = 66.20% Raise

1.667 > 1.222 = 36.41% Raise

1.667 > 1.410 = 18.22% Raise

For those considering a ratio change the following may prove useful.

MPH per 1000 rpm = 2.976D/ MTR

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