[99 to Life]

keep in mind not all 4l60e will mate flawlessly to the gen3 block. Three modifications are needed if the trans didn't originate on the gen3 block. 1. Flywheel holes need elongated or get a new flywheel, 2. an adapter plate is needed since the cranks are different 3. which is least of any ones worry, one bolt hole won't be used on the trans to engine block. I'd ruffly say most trans that came from 98/99ish and older are more likely to be a gen2 trans. So just something to keep in mind if someone is searching for a 4l60e and isn't aware that not all of them are the same.

If using stock efi, I'd go with 4l60e, 65e or 80e. The 80e is a bigger and heavier trans, overkill for most mild LS stuff.

If going carb over efi on LS engine, (what I'm going through right now) it does get pricey with not only the stand alone controller, but you need a throttle position sensor which is about 130$. The TCI brand controller is nice bc it comes with a handheld cpu. Can't give much more on it as I don't have it yet.