Hi Sir or Madam, welcome. I'm Steve. And I will be assisting you today. This is actually common in these. What happened is the sub shaft between the trans and diff stripped out. Pull the plug over the shaft and you will find the cavity filed with red rust dust. Sometimes you can get away with just replacing the shaft. But usually the output gear in the trans will need to be replaced as well.
Plug is frozen in case. Trying to break it loose. Your pic is a bit different than our trans. This plug is on trans case right side above pan correct? Takes 1/2 drive square rachet or breaker bar?
How do we determine if the failure is the transmission or the differential?
yes, we can pull the shaft back a couple inches. It is covered with red , brown grit. But if we mis-diagnosis this, it will be a major problem. The shaft will not come out all the way will it? It looks like the splines on the shaft are ok, but cannot see the gear.
ok, so it sounds as if the trans will have to be replaced. Either reman or good used. Thats gonna be customers choice. But if the shaft is bad as well, I'll bet another trans won't come with a shaft would it?
A reman trans usually will not have the shaft. A used one usually will. I ask the supplier to provide one when I get a used one. The shaft is about $350 new.
OK, well I suppose that answers our questions. These jobs where you cannot positively identify the problem are a major pain. I like to be exact when I diagnose and price a job so there are no surprises for us and the customer in the end. Thanks again...John