Serviced the trans yesterday and it looked very good inside the pan. I had around 100,000 miles on it since last service and fluid looked like new with very little material on the magnet. Was also going to do the BG injector flush but instead just changed the spin-on filter and filled with the cleaner and dumped the rest in the tank. Put about 180 miles so far and should put a couple hundred today and see what and if there is any improvements.

Serviced the trans yesterday and it looked very good inside the pan. I had around 100,000 miles on it since last service and fluid looked like new with very little material on the magnet. Was also going to do the BG injector flush but instead just changed the spin-on filter and filled with the cleaner and dumped the rest in the tank. Put about 180 miles so far and should put a couple hundred today and see what and if there is any improvements.

Is it a chemical flush on the trans?

Yep, they dump a cleaner in it then power flush. They also put in some fancy BG additive.

There is a spin on filter in the trans ? Kind of good not knowing , it means I haven't had any trans issues lately. Are you having a problem with the trans ? I suggested a trans fluid change to my dealer and he said to leave it because GM is using a synthetic trans fluid , needs less servicing . Usually these guys push this stuff .

The trans filter is a regular filter not spin on. Sorry I combined trans and injector flush in 1 thread. I still have the 53 mph shudder or whatever you want to call it but it has been there for 150,000 miles.