I had the rear end recall done on my 2011 GMC. I don't put a lot of miles on, mostly for towing. I don't like the dealer messing with my truck but wanted the recall done. Scheduled appt, all went well, until now I have a leak. I bought some gear oil and will service it and fix leak, but I have never had a drain plug, fill plug or gasket leak on a rear end and I serviced a bunch of them years ago.
The shop manager I worked for back then sold a bunch of services, just based on owners manual schedules. He would not push at all, just ask them if they needed anything done (often showed them in owners manuals the maintenance schedule). He was always careful to say, I didn't check to see if it has already been done, but if it has not, it is recommended,just let us know.
Cooling system flushes, transmission and rear end service, belts and hoses replaced are all easy money for a good shop.
The shop had a full service gas station out front also, 6 islands. Lots of business came in from there with belts or hoses needing replaced.
