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Old 02-15-2014, 09:46 AM   #1
my1stTJ2000's Avatar
Join Date: Feb 2011
Location: Lapeer, MI
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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?

2010 JK added 17" rims and 32 inch At tires, hitch, Ace rock sliders, Barricade bumper,
light guards, grab handles, floor mats, Grabars, Rock Ridge hood latches and fuel door.
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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.
For some, it is easier to kill the light inside of themselves than it is to fight the darkness all around them.
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Old 02-15-2014, 11:57 AM   #4
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Location: Pine, Colorado
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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.
2005 Rubicon LJ, 4.5 lift, 35's
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