3rd gear started slipping. It has an automatic transmission but I had to drive it as if it had a manual transmission. 1st gear , 2nd, then 3rd. After a bit 2nd started slipping ,then no gears except Reverse. I changed the filter and the trans fluid because it was black. I found very little metal shavings. Put Lucas transmission fix in it now reverse is good, 3rd hesitates then lundges forward, 2nd and 1st really hesitate and sometimes the vehicle will crawl if I accelerate almost to 3000rpms in 1st and 2nd?
You could try another fluid change to see if it might help, but I doubt it. Since the old fluid was Black you probably need to budget for a replacement transmission.
Time for a new transmission.
You didn’t ask that or any question. Just because you ended that last sentence with a question mark, didn’t make it a question.
No amount of fluid changes will fix this.
4l60e? Yep. Clutches tend to fail. Quite modest rebuild prices since so many fail. Big market
Might just be a 4L80E in a 'Sclade with the 6 liter engine, I thought. Either way, gotta get replaced. I’ve got 140K with some serious heavy towing duty on my 4L60E and it is just fine.