For the differential mount, rear squatting when placing the transmission in drive and rear lift when placing in reverse were the symptoms. Yes, it will give you maybe an inch or so. It's four bolts holding it to the chassis and two into the back of the differential. (Be sure and support the differential when removing.)

For the subframe bushings, do a search as there are good posts with photos. Especially, check for posts in the DIY section as Will Hunter has sorted many good posts that help in these areas. It requires unbolting the leading end of the trailing arm from the subframe (no tire or wheel removal). Not difficult techwise but buy some epsom salts for a tub soak if you have seen a few years as it is a lot of "up-n-down". Specialty tools, such as the MB spring compressor, are available in "Tool Rental" from other forum members.

__________________
Sam

84 300SD 350K+ miles ( Blue Belle )