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Old 02-15-2014, 09:46 AM   #1
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Horrible bang when beginning to accellerate.

When I accellerate in 4Hi, I sometimes experience a loud bang noise. Sometimes shifting into second gear. I think it might be the t-case but not sure. Anyone got any ideas?

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Old 02-15-2014, 10:04 AM   #2
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How are your U-joints?

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Old 02-15-2014, 11:17 AM   #3
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Could be a motor mount, transmission mount, control arm , broken shock mount, sway bar link, or a number of other possibilities. I'd check those first though if it were mine.
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Old 02-15-2014, 11:57 AM   #4
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All of the above, plus you might want to try pulling your rear drive shaft out and putting a little grease on the splines for the slip yoke where it enters the t-case. I had some binding there in my last Cherokee and it caused a nasty bang on acceleration. If you came to a hard stop, the rear of the Jeep would lift slightly as the nose dove a bit and it would stay that way, held up by the binding slip yoke until you started to drive away, then it would suddenly release with a bang and allow the rear to squat as you accelerated away. I had never heard of this until it happened to me. I do think this is much more noticeable with an automatic trans than a manual however because an auto trans will keep a little rotational load on the driveshaft while you are stopping.
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