Question about 1999 GMC Sierra
First check the oil level in the gear box if its low fill it up,,it could be a blocked filter in the box itself or the velve block pistons sticking it may need a set of rubber "o" rings fitted to the pistons to sort out this problem
Posted on Jul 13, 2010
Testimonial: "Thanks for the ideas. Maybe the o-rings."
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Posted on Jan 02, 2017
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