$82 in labor one side only sounds like scotch tape and bubble gum. Gem em both done and tranny mounts too. Knowin yer 300SD can reach 408k easily if well maintained.

Dunno why "high mileage" syndrome gets applied to diesels. Everybody here knows 250k aint nothin for one, and we hear little of em dyin at/near 350k+. More like everybody gets scared and ditches em first, I dunno why.

Seriously these engines achieve plateau where seems like they last forever, just gettin slower and slooower thats all.