Reverse imput drum warped? and why?

[email protected] · June 2, 2016

On my first 4l60E rebuild.

I purchased this truck a few years back but only logged 15k on it

during the purchases it had just recently had a freshly rebuild transmission.

Always had a jerk to 2nd gear and a light clunk to 3rd <thought it would smooth out and maybe a mount so I put it off

Well the otherday it its lost 2nd and 4th was real weak the 3rd gear clunk was sounding clunkier <--my own made up (word trans temp 4 min of driving 230 degrees)

So after the fluid flush and servo inspection I pulled the trans which yielded nothing <-- Ps no TPS codes once pulled looked at 1-2 acc and check balls only count 7 may have lost one or maybe one was left out, thought there were 8 loose balls total?

The band doesnt appear to worn but on one side its obviouly not as gritty. the reverse input drum looks warped kinda moon shaped also I knoticed the metal pitting assuming from slapping up against somthing but what and why?

What would more likely cause this was a part possibly left out bearing or just happens . also is this warping actually warping every pic I pulled up online looks strait.