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...