No upshifts at all -- stays in first (or second) no matter how fast you drive?

Busted governor gear from a disintegrated check valve, not a bad fix, but not free.

Otherwise, a valve body problem made worse by thick tranny fluid, I would guess.

There is a cold engine shift softening control on my 300D, but that won't change the shift points.

the 603 IS sluggish cold -- until the combustion chambers warm up, output is low. Drive gently until the temp guage moves, nothing you can do about it since it won't warm up much just idling. I let mine idle until it runs smooth, then drive about 20 for the first half mile or so.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!