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  1. M

    L31 to LS1 swap in my 99 Yukon

    Hey guys just a few questions with this swap I'd like to do. 1. will my stock 4l60e work and bolt up directly to a Ls1 block or would I need to get a new transmission and/or adapter. 2. If it will work, would it work with a LS1 wiring harness and PCM? 3. Where can I find a reliable site to order...
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