Do the motor mounts one at a time. Put the jack under the oil pan with a block of on top. Position it slightly to the side your replacing--you'll get it up further. Break the bolts first on both sides to save time underneath the car. Just jack the car enough to slide the mounts out--if one is collapsed, it'll be pretty far. Do the trans seperately. Jack with a piece of wood on top towards the back of the trans. Check the flex disc and shifter bushings while your there. I just did all this 2 weeks ago on my 300D. About 3 hours.

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1990 300D 2.5
1991 F350 7.3 Dually IDI

1997 F350 gasser dump
1980 H-D 93 inch Shovel
2000 SE Roadglide