1998 gmc z71 transmission will not shift into 3 or 4

Asked by Jun 26, 2018 at 10:35 AM about the 1998 GMC Sierra C/K 1500

Question type: Maintenance & Repair

Truck will not shift past 2nd gear. Sometimes it
works fine but 99% of the time it doesn’t. The
speedometer seems to be about 20 mph higher
than it should be and the fuel gauge has a constant
vibration in it. There is a vacuum hose that comes
off of the top of the motor that is about 2 feet long,
that I don’t know where it goes. Also a larger hose
comes from the transfer case to nowhere. Any
suggestions?

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