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4l80e goes to neutral

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Old September 22nd, 2013, 9:52 PM
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Default 4l80e goes to neutral
91 gmc 4l80e rebuilt shifts fine until it hits 4th gear then its coasting apply gas goes into third and coasts until gas is applied then it engages Change engine from 454 to 350 Does the prom need to be changed Trans has all new electrics engine has all new electrics new rad and trans cooler engine has rv cam Baffled
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Old September 22nd, 2013, 11:53 PM
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Welcome to the site bruce cairns, thanks for joining us!
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Old September 23rd, 2013, 11:14 AM
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Welcome to the forum.

You might post your question in the pickup section to get more response on help.
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Old September 23rd, 2013, 2:16 PM
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It sounds like a torque converter issue. Is it shuddering at all?
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Old September 23rd, 2013, 8:56 PM
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new torque converter seems like when lock up occurs it goes to neutral
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