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I’m sure a v8 swap into a 6 cylinder E53 is doable, but I suspect the least brain damage method would be to take everything from a donor…motor, gearbox, harnesses and most of the boxes/controllers. A very partial list would include at least the DME, DSC, EGS, and EWS. I think the front diff and AC compressor are the same on the V8 and straight 6 cars, so you can rob those from yours if needed.
I think all the E53 cars had either the 5hp or 6hp transmission, so no 8 speeds were used with either the N or M62. Someone smarter here can validate that. The 8hp in my wife’s G05 operates in an entirely different universe than any auto slush-box I’ve ever driven and has perhaps changed my mind about having an auto in any new cars I might have in the future. Except an M3…would have to be manual for me.
I daydream about swapping an 8hp into my E53. But relative to the swap of a complete m or n 62 motor and drive train into an e53, I think swapping an 8hp into an e53, and getting it all to play together, would pose a lot more brain damage and hurdles.
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Current
Original owner 2002 E53 X5 4.4i to 4.6i swap
2026 G80 M3 6 spd
2025 G06 X5 50e
Former
1972 Audi Fox
1986 Saab 900S
1996 BMW Z3
1998 BMW E36 M3 Sedan
2004 BMW E46 M3
2006 Audi A3 Quatro
1993 Mopar 318 Jeep Grand Cherokee
2015 V6 Jeep Grand Cherokee
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