Hi, I please need your help!
A few month ago the car overheated and I finally decided to change the main parts of the cooling system at 145.000.
I just changed radiator, expansion tank, expansion tank retainer and pipes, oil cooler thermostat, water thermostat, water pump with Stewart Components water pump, pulleys, belts and tensioners, upper and lower thermostat hoses, and filled with BMW blue coolant.
There's no visible leak on any of the changed components or other hoses but there's a huge leak coming down the transmission bell.

Any Ideas on what the problem can be?

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