I thought Viper Gears were actually Dana parts...
I am using Yuon gears in my Dana 44 in my 89 with no issues, as long as the person setting them up know his stuff you should get no whine. Don't forget the Speedo correction gears too.
I have bought a set of 3.73 and 4.10 from this place.. the 4.10 is stil in my 89
http://www.ringpinion.com/Default.aspx