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my truck is reving up and down while in 5th i have heard of this called hunting??

Old Mar 8, 2008 | 5:25 PM
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Default my truck is reving up and down while in 5th i have heard of this called hunting??

it seems like when im in 5th gear going 60,70,80,90 and sometiems 100 kms my truck idles up and down a few grand like 3rpm sometimes like 5rpm if its doing it really bad doesnt do it as much if my truck is cold and never noticed it doing this if i put it into number 3 just in overdrive it does it does anyone have any ideas as to what this could be? its a 1999 chevy s10 zr2
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Old Mar 8, 2008 | 7:17 PM
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Default RE: my truck is reving up and down while in 5th i have heard of this called hunting??

is an automatic or manual
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Old Mar 9, 2008 | 1:04 AM
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Default RE: my truck is reving up and down while in 5th i have heard of this called hunting??

automatic 4x4
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Old Mar 9, 2008 | 2:37 PM
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Default RE: my truck is reving up and down while in 5th i have heard of this called hunting??

if it is only doing it overdrive it could be the servos for that gear going out. if its not catching all the way or slipping it will cause the engine to rev higher to try and maintain the speed you are going. i would have the transmission looked at
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Old Mar 10, 2008 | 9:22 PM
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Default RE: my truck is reving up and down while in 5th i have heard of this called hunting??

what do you mean by the servos?
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Old Mar 11, 2008 | 11:55 AM
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Default RE: my truck is reving up and down while in 5th i have heard of this called hunting??

with the 700r4 and any eltronically controlled transmission there are things called servos. the job of the servo is to shift the transmission into the gear you have selected. if a servo is not working properly it will not shift the gear either all the way which would cause you high rpms or not shift at all.
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