have you ever changed the gear oil? i once had a mitsu where i changed the oil to 85w-90. the spec called for 75w-85 which i couldn't find. end result was that in the colder seasons i had to struggle with 1st & 2nd until it warmed up. if you have straight 90w in there it will be even worse...
1993 300e-2.8 - gone now <sigh>
"Do not adjust your mind, it's reality that's malfunctioning"