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Defender Transfer Box - TD5 into 300tdi


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I have the option of obtaining a new Defender TD5 transfer box part no. IAB500104 (LT 230 code 57D), the vehicle I have is an early 300 TDI, with standard R380 gearbox and 22D transfer case.

Is it possible to utilise the TD5 transfer box on my vehicle?

The price looks reasonable, and as I am in Kiwi, may be a handy thing to have on hand.

Ratio is the same at 1.410

Cheers and thanks

P

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Thanks for the replies, I've also the option for a Transfer box from a Disco 2 IAB500090, same deal, new parts ex store.

Might be worthwhile picking the disco up, as it has higher gearing - will do a bit more research.

Thanks for help so far

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The Disco box may or may not have the internal Diff Lock mechanism installed, some didn't on those models. Bit of a faff to fit it.

Defender box should fit, input gear won't be a worry as presumably it will come with a new gear that matches the intermediate gear in the box! A Td5 Defender box will be an LT230Q as well, which will reduce the transmission noise that the older models can produce :)

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Thanks James, The price is around 250 quid which for a new box seems good. Not sure if the 300 tdi would cope with the increase in ratio using the Disco? however engine has been rebuilt and is good as.

Might just pick up the TD5 and take it from there.

All the best

P

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£250 is very good for a new box. I'd snap one up in an instant at that price.

Your 300Tdi will pull the higher Disco gearing under normal driving conditions, but it's probably not to be recommended if you regularly tow, run full loaded, or drive in very hilly areas. From what I've read it's a personal preference, personally I'm happy with my gearing how it is but then I only have a 200Tdi so oodles of power is not available to me :P

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Somewhere I recently stumbled upon a list of transfer box prefix codes, and the Disco 2 units with no diff lock parts have their unique prefix. So if we can find and direct the OP to that reference he can check the box numbers before he buys :)

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Ah, just found the list on my USB stick, however I cannot recall its origins.

Anyway 70D prefix is the Disco 2 with no diff lock.

<geek> Another difference is that D2 boxes are 1.211:1 ratio, marginally taller than a D1/RRC unit which is 1.222:1

</geek>

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Ah, just found the list on my USB stick, however I cannot recall its origins.

Anyway 70D prefix is the Disco 2 with no diff lock.

<geek> Another difference is that D2 boxes are 1.211:1 ratio, marginally taller than a D1/RRC unit which is 1.222:1

</geek>

Does it happen to be in a PDF or other postable format Michael?

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The Disco box may or may not have the internal Diff Lock mechanism installed, some didn't on those models. Bit of a faff to fit it.

Defender box should fit, input gear won't be a worry as presumably it will come with a new gear that matches the intermediate gear in the box! A Td5 Defender box will be an LT230Q as well, which will reduce the transmission noise that the older models can produce :)

I dont think all TD5 boxes are LT230Q. LT230Q are prefixed with 36D, 37D, 38D & 40D (the first two are disco units and the second two are defender). IIRC, this is worth bearing in mind if you are fitting an overdrive, as the input gears for the LT230T have a different angle on them IIRC and you will need a special input gear if you fit an OD to an LT230Q.

The box will fit fine. I fitted a TD5 LT230 box to my LT77 on my 200tdi here:

http://forums.lr4x4....showtopic=70258

The only extra bit i came across was the warning sensor for low range - i just taped this up.

Also, your current speedo gear will fit straight into the TD5 box, so no worries about having to convert to the TD5 speedo.

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Thanks for al the help so far, I have already fited the TD5 gauges to my 300tdi -fantastic upgrade, so no problem with fitting the electronic gear into the TD5 box.

The seller did advise that the box was for the TD5 was for a post 03 vehicle, and that I would need a high/low switch IGM500011 and adaptor wire YMQ105170 if fitting to an earlier vehicle.

Got the serial number of the D2 box (BAF24, 1.211 Ratio 4wd, 70D105072G)

Not sure if it has diff lock fitted.

Best regards

P

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A 70D prefix will likely not have a diff lock.

Here is the info I have, not sure who to credit for it though:

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

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