I pulled a motor and tranny out of a 300d without a load leveler and installed them both into a sd without a load leveler. I did all of this by my self, so it cant be too hard. Its just a pain in the ass, and I didn't do any cutting. Took me one day. One thing that helps is to put a floor jack under the tail housing of the tranny, that way you can lower that as you need to and it will roll toward the front of the car as you lift the engine out. The single hardest part is predicting how long your rear chains need to be compared to your front in order to get the angle correct. I had to set the engine back in several times. And another thing, have fun with the engine mounts. The big allen screw on the bottom in the cross member likes to strip. You can either just rip the motor off the mounts, unscrew the two 6mm allens in the top sides of the mounts, or cut the motor mounts (if your motor is coming out of a 300d, their worthless to you anyway).

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1981 300SD 512k OM603