'97 Bonneville - occasional bang when shifting out of Park - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 06-10-2011, 10:55 AM   #1
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Default '97 Bonneville - occasional bang when shifting out of Park

Sometimes, when my car is parked facing uphill, the shifter is difficult to move out of Park, and the transmission engages Reverse with a bang. The latter happens more than the former, but never when on flat ground.

It'* an 4T60-E with about 130,000 miles. The fluid and filter were changed very recently. On really hot days, I can get a P1870 code set. Regardless, it has no driveability issues and still shifts quickly.

This doesn't sound like something that I can fix, but I'd like to know what could be the problem.
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Old 06-10-2011, 11:11 AM   #2
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When you park on a hill (uphill or downhill) engage the park brake while still in Drive with your foot on the regular brake, then shift into Park. That make clear up your problem.
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Old 06-10-2011, 12:14 PM   #3
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Sound slike your parking prawl is holding on. It'* a pin that hold the diff in place, teh diff rolls a bit and grabs the prawl pin.
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