Just Fishing
Can't fix stupid
Duck bill pliers is what we have for 4l60. Get an eBay stand that bolts to engine stand. Really helps. And don't cheap out on the spring compressor. I think we first had a $20 job and it was a pos. Got the $100 one, can't remember brand. Worth it. Also, just cheap lip seal tools. No need for the expensive ones. They break just like the cheap ones. Good dial indicator for end play and some feeler gauges for clearances and you'll be good. I'm sure they have a few other specialty tools that I'm not thinking of or aware of. They say the 6 speed is one of the easiest transmissions out there to r&r (some may disagree but it's all just nuts and bolts to me. Do one, do them all). Post lots of pics and I wish you the best of luck!
6l80 has this massive snap ring, apparently there is a lot of tension on it.
I have some duck bill type of snap ring pliers that i used on my 700r4, slight modification to them to really grab.