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Dammit. I'm late to this thread. I built a bench harness for tuning PCMs out of the vehicle. I have connectors wired up for GEN 3 LS as well as 90s W-body (practically same connector, just different pinouts). I could do it for cost of HP credits and some beer monies.

I sent it to pcmforless.com in Stow, OH. I have used them in the past on other projects. We’ll see how it goes. I hope they can figure out the gear change and tc stall speed conundrum with the shift points.

Silly. You'll need a "real" manual for future repairs, too. https://www.ebay.com/itm/133018595088?hash=item1ef886af10:g:54EAAOSwzTRcrfAb&amdata=enc%3AAQAHAAABEATpHjPu10RHrnCty9avUOYOel0fml%2BwoNkV0D%2BPLXFJgUy3Urav5O46OZzhoGVCmMB7%2FJntCGA9QPMsfGxXbL0LQ7YiUCvODy0Wy6ZMpx9JwEnr1B09lrlsJQ2KFrLfEa6oIdRlvQIsqCSJTobuVePrRklJqSqi%2B%2FJ0SGJ5QlpYCpH5zsknBAX51Ur%2FOtKEB3XIiA81%2FN4i0mDuu0uflU27qRaiQQng7k4jG2bHStgHq7Wto8oY%2B99LtEE%2BHWHYrFR9bYzQqTMGgHcy4gOXwVHNwLwci515SmKV4dH%2F1qXLwW%2BrmgrzQT8NEjVsR5AP8eTl7dsL4kuYeC8XPv7PvRtvne%2FAQRWQ%2BWC%2Bd8FpiGgz|tkp%3ABk9SR_jvqdXkYA $32.12, no shipping charge. The disc--CD or DVD--versions are a pain in the ass to scroll through, but nice when using the "search" feature. I prefer paper manuals, given a choice--but I have two service manuals on disc. They work. https://www.ebay.com/itm/141991629754?hash=item210f5c53ba:g:3fQAAOSwubRXNdiP&amdata=enc%3AAQAHAAAA0MsMdcZ9%2BQlSC9VKZ8hQCWADzXxpBfcG1PGgwjEEjk3%2BYvcqqMv2ABHDXs2O3A1wB%2FXunoxYTQDssP2v9HwkfRg%2FNdBO6Xb9PKBycOz8g%2BP4SzBxGgBwy4Yas7VYipXg%2Fykj0kzz4FOurfacc33GSySP1OvQY%2BaP%2Bcxbef1oLkBLmtjrCfHoSRwsrmDwH3aeUCxu9VHz3%2FyyE51HS%2BuNLOd2sBcKFRU2Ia0Y3M5CMBbWfNQ%2F3GqYo0gXFI4nqS%2FkNQqVYiWRE9KxKmZ2dPPf%2FFw%3D|tkp%3ABk9SR_TKvNXkYA $27 "or best offer". No shipping charges. VERY recommended. About what I paid for mine, ten years ago. Clymers, Chiltons, Motors, and Haynes repair manuals make great emergency toilet paper.