The intent of my original comment was to help keep costs down. These projects have a way of spiraling out of control. It is amazing how $100 here, and $300 there, becomes an additional $10,000 in what was often supposed to be a low dollar project.
By the time you upgrade the S10 4L60 to 4L65 specs (not a full rebuild, just a hard part upgrade), and purchase the flexplate / spacer kit - you will have exceeded the cost of a good used LSx 4L65 - and would still not have a completely comparable transmission.
My two cents is either sell the LY5 (Gen 4) engine and purchase a Gen 3 engine, or sell the Gen 1 style 4L60 and purchase a Gen 4 style 4L65.
Just trying to highlight some potential hidden costs, not trying to derail Dave's thread.
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