A friend asked me to take a look at his 2008 500 EFI. It was going into 4 wheel drive but seemed to have to have a lot of rear wheel spin. I checked the fluid and couldn’t see or feel any so I drained it. That’s where things get ugly. The stuff that came out was like glue so I figured I’d flush it with Kerosene After 5 times the Kerosene was starting to clear up some what. Then I tried some ATF fluid that still was dirty. When I put the fluids in I would run it around the yard a little bit also. My question is Should I continue flushing till clean or just tear it apart and do a good cleaning? By the way it isn’t going in 4 wheel drive at all now. Assuming from all the crud being loosened up things are stuck.