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  1. #1
    Join Date
    Dec 2010
    DuBois, Pennsylvania, United States

    Default Wiring diagram needed OBD2 to OBD1

    Switching engines from 1997 engine, 5.7 Vortex to a 1991 for a 5.7.

    Need the diagram to connect bulkhead connector pin outs and colors to perform this.

    Can anybody help? Anybody have access to AllData? I understand they have it but for all the more I play with this, it's not worth the $165 to me for a month's access.

  2. #2
    stephan's Avatar
    Join Date
    Sep 2010
    Far West, Oregon USA,
    Blog Entries


    Hey Shawn, welcome to the GM truck club. That may be kind of tough to come by. GM isn't very forthcoming with their w.d's... When I wanted to put a 4L60E in my older truck they wouldn't even share that simple wireing diagram with me.
    1988 Chevy C-3500 2wd (no pic)
    350 c.i. 5.7 L Stock Block, 4 Bolt Mains
    L-31 Vortec Heads, Edelbrock Cam & Intake,
    Holley 650, Flowtech Headers, Magnaflow exh.
    Jet Trans 700R4, B&M Ratchet, 4:10 gears,
    3" susp. lift kit "shadetree"
    No rev limiter, No speed limiter lol

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