The value of the reduced temps of 70 degrees is of course, a comparison between a low grade crude lube verses there synthetic. There is no doubt that this temp differential is likely. All excellent synthetic racing engine oils are rated and graded at a particular operating temperature. The good ol 10W-40 sae ratings are all made at two temperature's to measure the viscosity against each other in stock OE applications. Redline, Joe Gibbs and a few others direct oil choices based on bearing clereance, expected operating temp's and RPM's. In pro stock drag racing the oil viscosity is extremely thin because the engine oil will be near 70 degrees F and high RPM operating conditions. A bracket racer with a large cube engine will require a higher viscosity oil for the likely 190 to 200 deg F oil temps that are possible to maintain any kind of oil pressure and protection.
The shock proof oil label is a cleaver way to word that it is appropriate for drag racing high powered conditions. Other brands have not bothered to word it that way yet. The differential viscosity for a say 1000 + hp engine should be using a 90-145 viscosity and not the thinner 80-90. The viscosity is measured at a temp. Measure up the oil that best suits your application, temperature, bearing cl and RPM and you will have done the best any one could do. And to agree with DrivengmissDD, Red line makes a great product and so does Joe Gibbs whom has a web site that spells out the method to select the appropriate lube for any application. You could use that info and extrapolate it to other brands that you might prefer over gibbs.
They both use temp based applications and that will give you the best protection and performance from your engine. And always use a quality Synthetic in all racing differentials, always, always.
Food for thought.......