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CATEGORY LISTINGS > GM DIESEL > 98 6.5 hard shift transmission over 62mph (100k) [ REFRESH ]
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98 6.5 hard shift transmission over 62mph (100k)


Created On Sunday November 28, 2010 10:31 Diesel Talk
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OldShark
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Posts: 2
Joined: Nov 2010

Note Sunday November 28, 2010 10:31 View thread in raw text format
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98 6.5 turbo 3500, 4L80E trans, 4X4. Speedo will only read to 102-105k while in reality speed will be anywhere from 112k & upwards, then when slow-down to 1st gear & began to increase speed, transmission will shift hard. This hard shift will occur also if traveling @ 80k & kick in passing gear. If I pull over, shut truck off, park for 1-2 min, restart & drive, shifting is smooth. I can also drive truck at speedo reading 100k, which in reality 106k all day long without a problem. Replaced High Speed Sensor, everything fine for an hour or so, then problems again. There is no 2nd speed sensor on transmission. Computer "Flashed", worked fine for 3-months.
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