Please excuse this transgression. My son just bought a used automatic Nissan truck. When driving it home on the highway the trans would not shift into highest gear. I noticed that the fluid level is very high on the dipstick... a good two inches too high.
Could too much fluid cause the transmission not to shift into high gear?

Many thanks to anyone who may have some knowledge about the situation.

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Earl



1993 190E 2.3
2000 Toyota 4x4 Tundra