We just got back from a trip to the Sierra, and at about 6,500 feet I noticed that the tranny shifted harder than at sea level, especially from 1-2 and when when passing. Why is this?

Next week we are taking a trip to about 10,000 feet, and I wonder if this kind of shifting puts strain and wear on the tranny.

BTW, my off-the-line accelleration was terrible, with lots of smoke; upper-end was okay.

The good news: no noticable oil loss on a 1,000 mile drive, and I got about 30 mpg on the freeway!

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'83 300SD, 202K
'76 Ranger 23

Thanks for sharing the information...

I do believe the transmission modulator valve is affected by altitude...[decreased atmospheric pressure...]

No need to re-adjust the settings though, because most of your driving is around sea level...

Thanks.