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Old 01-27-2010, 07:17 PM
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AzNMpower32 AzNMpower32 is offline
Tar Heel Faithful
Location: WNC
Join Date: Oct 2005
Posts: 14,125
Mein Auto: 2006 325i; 2015 Yamaha R3
Could it simply be the torque converter locking up at speed during acceleration? Based on what you describe, your vehicle is in 4th gear at that point, and usually the AT locks up the torque converter as you accelerate from 50-70mph
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