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Thank you for the tips. I'm running on 2.26 3 bearing diesel original engine. Normally its bit noisy and with 4 speed gear box is another issue. recently I've imported over drive from UK for my landy. Its reduce some noise and improve gearing on road too.With the over drive now I really feel I need more power. Nissan caravan engine is TD27 and new one is QD32. I saw an article of LRO magazine, TD27 is a good option For defender, and they do have conversion kit for it too. If I go for TDi 200 or 300, I can buy 2 nos. of TD27s. I'm trying to keep my original gear box as much as possible. And I don't like to change the front grill too. I've improved my front drum brakes to disk brakes, and I'm planing to do it rear brakes too.