[urq] Different Tread Depth and Effects on Driveline

[raygriffith at juno.com]

Because of sidewall damage, I had to replace one tire. I decided to replace two. My question; Given that I will have two new tires and 2 slightly used tires (est 5000 miles) will the difference in tread depth between the front and rear have adverse effects on the Quattro system? 
Car; 1984 urq 
Tires; Dunlop SP Sport 5000 P215/50ZR/15 

Thanks, 
Ray Griffith