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Old 05-18-2013, 08:05 AM   #1
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Bucking Horse

I have a 99, with a 4.0. Sometimes when I take off in 1st Jeep starts bucking like a horse. Almost like someone is flooring it then letting off the gas in very quick cycles. Sometimes continues when I shift to 2nd. Don't know if its my imagination, but sometimes seems to surge driving down the road 60 mph. Thoughts?

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Old 05-18-2013, 10:05 AM   #2
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Don't know about your surging at 60, but bucking in 1st is fairly common if you hit bumps or very uneven road as you're taking off. It can set up kind of a harmonic thing with your foot slightly moving on the gas pedal and the bouncing (even though you think you're applying steady pressure to the gas). We have one street around here where there's a slow dip right across the intersection from the stop sign, then a series of ridges right after that and it will make it happen every time. I usually just shove the clutch in and coast past that spot.

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Old 05-18-2013, 10:20 AM   #3
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X2^^ Yep, happens now and again from a stop light.
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Old 05-18-2013, 11:56 AM   #4
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Sounds great. Won't worry about it then.
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Old 05-18-2013, 12:20 PM   #5
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Has the trans mount ever been changed, If not it's 14 years old and that rubber takes a lot of abuse. It will feel like a herkey jerkey when releasing the clutch from a standing start.
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Old 05-18-2013, 07:30 PM   #6
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Doesn't really do it when I release clutch. It's shortly after as I accelerate. Tranny was rebuilt approx 5k ago and all parts replaced new.

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