Anyone changed their rear end for more towing capacity?

Buy the OEM 3.73 gears off the internet, have a reputable automotive garage do the change and GM will never know the difference. Yes, it will make a difference in how it does the job, but it will still be a 5.3 pulling a heavy load. I am very happy with my 6.2L NHT pulling 10K, so it will do the job.