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Old 02-04-2009, 09:26 AM
emt932359 emt932359 is offline
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07 Expy banging in 4x4

While drivingn in regular 4x4, when accelerating, does anyone also feel a slight banging in the tranny area, not sure if there is any slip clutches that allow for this or if I have something out of line. Thanks
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Old 02-04-2009, 10:48 AM
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Bopper Bopper is offline
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I don't feel or hear any banging. My 08 Expy only has 350 miles on it though. Are you on a slippery surface where the front wheels are actually engaging or is it on dry pavement.
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Old 02-04-2009, 02:09 PM
emt932359 emt932359 is offline
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I found this while on slippery surfaces ie. snow, ice. Basically what happens, if i accelerate, i can feel the rear wheels slip and bit and the occasional bang. It is in reg. 4x4 and not the auto.
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Old 02-04-2009, 03:06 PM
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Tranny banging on any surface, I would imagine is bad. Can you say Warranty?
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Old 02-05-2009, 06:28 AM
chuck s chuck s is offline
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Regular 4x4?

If you're in 4H the front and rear axles are locked together and when the wheels turn at different speeds something has to slip and bang. Usually a tire on the pavement but the shock runs back to the axles and truck.

In 4Auto the front axle can make a bang as it engages if the rears slip. This happens as the slack in the drive train is taken up.

-- Chuck
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Old 02-05-2009, 07:19 PM
emt932359 emt932359 is offline
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It is when in 4H. I understand it will due it in 4A due to the locking mechanism.
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Old 02-06-2009, 07:20 AM
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I went out the other day after reading your post. I put the car in 4H & 4A on a freshly snow covered street, I excelerated, stopped. Put the car in park. excelerated again. I did not turn hard during any of this. In 4H or 4L I know the car will grunt and groan during sharp turns. I did not hear any banging or thunking.
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Old 02-06-2009, 07:20 AM
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