E53 5speed To 6speed Swap.

[Jps1995m3]

Originally Posted by e39_touring

YES - that's the thread that originally gave me the inspiration to do this. I ran into a few inconsistencies when researching the swap, but I've cleared those up in the other thread I had about swapping diffs. Turns out it is plug and play on the pre-LCI cars (I was worried that the full rear axles would have to be swapped, but that's not the case).

Nice!!!!! So I’ll get some differentials from a 4.4 and just take the Flanges for the axles from my rear diff to the 4.4 to make the swap complete in the rear?

[Cyrix2k]

I'd look at the GS6X37BZ/DZ gearbox (BMW part# 23007563053) used in the late e46 iXs. The e46 shares the same 5-speed trans with the X5 and never received X-drive, so there's a high likelihood your old transfer case will bolt up. The e46 used the same transfer case its whole production run as far as I can tell.

[Happy]

Originally Posted by e39_touring

5th is a screamer on the highway.

This is when I give AMG’s a hard time.

[e39_touring]

Originally Posted by Cyrix2k

I'd look at the GS6X37BZ/DZ gearbox (BMW part# 23007563053) used in the late e46 iXs. The e46 shares the same 5-speed trans with the X5 and never received X-drive, so there's a high likelihood your old transfer case will bolt up. The e46 used the same transfer case its whole production run as far as I can tell.

This is a great thought. I just did some poking around on realoem, and it appears the e46 ix transfer case is more like the x5 lci atc500. It's a similar bolt pattern but doesn't look to be an exact match from what I can tell. I think the e46 is slightly different because of packaging (i.e the front driveshaft is more tucked in than on the e53). The pre lci x5 tranfer case (nv125) will definitely not bolt up to the e46 trans. Possibly, you could put the e46 transmission, front driveshaft and front diff in the e53, but the differential ratio would be different than any made for the e53.

[Jps1995m3]

Originally Posted by Cyrix2k

I'd look at the GS6X37BZ/DZ gearbox (BMW part# 23007563053) used in the late e46 iXs. The e46 shares the same 5-speed trans with the X5 and never received X-drive, so there's a high likelihood your old transfer case will bolt up. The e46 used the same transfer case its whole production run as far as I can tell.

Thanks for the idea originally but I want the 6 speed and I was thinking to use the 6 speed transmission from the e46xi but I have really checked out the part numbers.

[Cyrix2k]

Originally Posted by Jps1995m3

Thanks for the idea originally but I want the 6 speed and I was thinking to use the 6 speed transmission from the e46xi but I have really checked out the part numbers.

Yeah, that was my point. Here's my logic:

The 5-speed is shared between the e46 & e53 3.0. The e53 LCI transfer case bolts to the 5-speed (although e39_touring says the pre-lci xfer case doesn't) and we know the e46 transfer case (nv125) bolts to the 5-speed. We also know the nv125 bolts to the 6-speed used in the e46 so it follows the nv124 should bolt up as well, so that 6-speed should work in an e53, in theory. You might need to figure something out for the shift linkage but I'd imagine it will be close if it doesn't work out of the box.

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