He doesn't mention changing out the differential. I would think that would have some pretty tall gears for a 617 to turn. It may do 80 without vibrations, but how long did it take to get there? My guess is a 240D auto would blow its doors off......Great fuel milage though

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81 Mercedes 300SD 289k.......SOLD
82 Mercedes 300CD 252k......slow ride

82 mercedes 300 SD...mi Unknown
83 Mercedes 300D ????ksniff..gone too
84 Mercedes 300D 148k........SOLD
85 Mercedes 300TD 386k and holding some one elses project