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