Drivetrain question

[ShimShim]

About a month ago, I bought a 2002 Ford Explorer XLT 4wd with towing package. After I bought it, I began to hear a whine coming from the rear axle when speeds were between 50 and 60. I brought it in to the dealership (a Nissan dealership) where I had purchased it. Following some research on my part, the problem was caused by the pinion seals in the rear diff. This is a problem that Ford knows about, and is solved by replacing the bearings and installing a new R&P.
All of this is under warranty, and they have provided me with a loaner car. They have had my car for two weeks, just received a whole new rear end yesterday and installed it. Overall I have not had reason to complain since I am not paying a dime for any of this, but...
The service advisor called me today to tell me that they sent them the wrong rear end, that they didn't know my Explorer was all wheel drive How can you have my car for two weeks, plan on and replace the rear end with out knowing it is all wheel drive????? They said that the new rear end "looked identical" How about matching part numbers, etc. Maybe even call Ford with my VIN and make sure you have the proper parts.
Anyway, she said that they found this out when they took it for a test drive. They didn't even make it out of the parking lot before they realized that obviously the gear ratios didn't match.
I took a long time to get to my question, but here it is: What should I look for to make sure they did not tear anything up driving, even a short distance with differing gear ratios front and rear??? The say that they are "confident" that nothing was damaged on the test drive, but if it was obvious enough for them to know right off the bat, I don't know how they can say for sure nothing was damaged.
I was already planning on demanding a full one year warranty on the new rear end, but now I am going to demand a full powertrain warranty for one full year, hopefully with unlimited mileage if I can swing it. I just need to know what to be looking for should something be damaged.
Thanks for the help.
Brian

 

[csudman]

The only way to really know is to crack the tcase/or whatever AWD vehicles use and look for broken teeth, stretched chain, metal shavings etc. Thats where the damage probably would happen if any would.

 

[ShimShim]

OK, so do I rely on the dealership to do that and trust them when they tell me it's not damaged? Or do I pay to have someone else look at it? I'm trying to get out of this without having to pay for anything, since afterall, that's how I started it.

 

[rbo1577186]

Try to get something in detailed writing stating what happened, just in case. Ford may try to cover it up and say nothing is wrong. I would also call up a Ford Customer care center and talk about what happened.

 

[ShimShim]

Try to get something in detailed writing stating what happened, just in case. Ford may try to cover it up and say nothing is wrong. I would also call up a Ford Customer care center and talk about what happened.

Service was done at a Nissan dealership, that's where I bought the Explorer. They are doing the work because they gave me a 30 day powertrain warranty. They told me when I bought it that any work they couldn't do, they would send it to a Ford dealer. I figured that they would do that for the new rear end, but they decided to do it themselves. Anything I get from them when I get the car back will be definately be in writing.