white90 Posted May 4, 2006 Share Posted May 4, 2006 this may be useful, from our website : 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 -------------------------------------------------------------------------------- D Tyre diameter in inches (more accurate to use 2 x rolling radius) -------------------------------------------------------------------------------- M Typical 5 speed manual box, select a ratio 1st 3.60 These ratios will vary a little between box types 2nd 2.11 3rd 1.40 4th 1.00 5th 0.77 Rev 3.43 -------------------------------------------------------------------------------- T Transfer ratio select a ratio High 1.003 1.222 1.410 1.667 Low 3.321 -------------------------------------------------------------------------------- R Differential select a ratio 4.70 S 4.11 L 3.54 S L Special S stock Link to comment Share on other sites More sharing options...
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