I've only owned it since 10/2011.

Yes 4.4. I'm not sure if the transmission or motor are original but the transfer case had some work done. I can confirm that from the threadlockless bolts that loosened over time. One bolt fell off onto the front plate and caused the front of the driveshaft to hit the case of the drivetrain.

If I were to guess the motor hasn't had any work done but the transmission probably was rebuilt.

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e70 - purchased 6/2018
e36 - wouldn't pass smog at 190k 2016
e53 - transmission blew at 225k 2012
e30 - sold as it was a little slow for a DD and burning oil at 220k 2011