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99 Jimmy shifting in and out of od

RedtrashRedtrash Member Posts: 2
edited February 2019 in GMC
My 99 Jimmy has just recently started shifting in and out of overdrive and feeling sluggish. Had her for 5 years and never had a idiot light come on. I'm assuming it's a vacuum problem at transmission or transfer case. Any ideas? She now has 217000 miles on her.

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  • RedtrashRedtrash Member Posts: 2
    Thank you, I'll scan those this week. I also have the 4X Auto option for the transfer case. I was told it takes a different oil. Is this true? and if so what type?
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