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Thank you all for your response, yes the 4jb1 is 2.8L, initially when I bought the car I had planned to try to fit a Defender gearbox to it, as the Isuzu gear box is not a good option for LR (rear output shaft is in the center not on the right side like on LR) but Defender gear box are expensive and rare in Thailand so putting back the car to stock specs with an original engine makes more sense I think. If my axles are not 10 splines will I still be able to swap only the crown and sprocket to fit within Disco axles? I assume nothing is straight forward when it comes to changing gears set on such items...

Hi all, I bought a Series IIa SWB 1962 about two years ago. The car was modified by previous owner, it has Discovery axles and Isuzu 4jb1 + isuzu gearbox fitted. A friend of mine is able to provide me an original engine and gearbox the question is: how (bad) will the Disco diff ratio fit with the Series gears? I understand it is a higher ratio. I cannot easily put back original axles as the leaf spring mounts have been relocated more on the sides of the frame to clear front diff and solve the steering linkage issue. I'd like to put back an original petrol engine what would be your advices regarding compatibility with the Disco axles, Shall I put the Series diff gear into the Disco axles or are there any other way around to restore the overall gear ratio while keeping the axles? Sorry if these mods hurts to read, I bought the car as it is, but miss the LR originality and petrol engine comfort. Your advices are greatly appreciated. (picture of my truck)