LRNZ Posted March 26, 2012 Share Posted March 26, 2012 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 Quote Link to comment Share on other sites More sharing options...
Orgasmic Farmer Posted March 26, 2012 Share Posted March 26, 2012 Should fit. The R380 gearboxes used in the TD5 differ from the tdi ones but AFAIK teh Lt230 transfer boxes are all interchangeable (though there may be linkage differences so don't throw the old one out till it is all fitted.) Quote Link to comment Share on other sites More sharing options...
Orgasmic Farmer Posted March 26, 2012 Share Posted March 26, 2012 just to be safe, make sure the input gears have the same number of teeth too Quote Link to comment Share on other sites More sharing options...
LRNZ Posted March 26, 2012 Author Share Posted March 26, 2012 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 Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted March 26, 2012 Share Posted March 26, 2012 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 Quote Link to comment Share on other sites More sharing options...
LRNZ Posted March 26, 2012 Author Share Posted March 26, 2012 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 Quote Link to comment Share on other sites More sharing options...
Retroanaconda Posted March 26, 2012 Share Posted March 26, 2012 £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 Quote Link to comment Share on other sites More sharing options...
mickeyw Posted March 26, 2012 Share Posted March 26, 2012 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 Quote Link to comment Share on other sites More sharing options...
mickeyw Posted March 26, 2012 Share Posted March 26, 2012 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> Quote Link to comment Share on other sites More sharing options...
LRNZ Posted March 26, 2012 Author Share Posted March 26, 2012 This is a great place - will chase up the serial number of the D2 box, in mean time have to admit the TD5 box is looking good. Cheers P Quote Link to comment Share on other sites More sharing options...
landroversforever Posted March 26, 2012 Share Posted March 26, 2012 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? Quote Link to comment Share on other sites More sharing options...
reb78 Posted March 26, 2012 Share Posted March 26, 2012 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. Quote Link to comment Share on other sites More sharing options...
LRNZ Posted March 27, 2012 Author Share Posted March 27, 2012 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 Quote Link to comment Share on other sites More sharing options...
mickeyw Posted March 28, 2012 Share Posted March 28, 2012 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 Quote Link to comment Share on other sites More sharing options...
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