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Old 05-10-2018, 10:15 AM   #25
Wgesnerjr
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Join Date: Jun 2015
Location: Atlanta, GA.
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Re: 85 C10 "Rob Peter to Pay Paul" 5.3 Swap

Assembly Line Diagnostic Link or ALDL is a proprietary on-board diagnostics system developed by General Motors prior to the standardization of OBD-2.

This is the underdash plug for the OBD system. you will need this.
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Jay Gesner
Atlanta, GA
1985 C10 Long Bed 4X2
LS 5.3, 4L60E
Father/Daughter Project
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