Question for those with 4.10's

For those of you that have 4.10's, what rpm's are you turning when you are running 70 mph and then 75 mph? I was driving to work the other day and there was a sign showing everyone's speed. Either they upped the speeds to scare people to slow down, or my car is still off. I got the complete built rear end (with less than 5000 miles on it) out of my friends Saleen that he totaled, and he was insistent that they were 4.10's. I have corrected the computer with my tuner. I'll post the rpms for my speeds later after I can get it on the highway again, I am having one huge brain fart right now. The rear end is an 8.8, 31 spline axles, Auburn posi. and I run either my stock 245/45 17's or 275/45 17 drag radials.

BTW, I only paid 200 for the whole thing! Then I sold off my stock rear for 350.

i checked it before i installed it while i had the whole rear end out of the car. my friend and i checked it countless times and both came up with around 4 revolutions of the yoke per one revolution of the axle. maybe im just losing my mind???

Well, after doing some HW and using the ever so valuable search feature here on stangnet, I have come to the conclusion that I do, in fact have 4.10's I called the guy I bought the rear from to confirm and hes going to fax me a copy of the receipt just for my piece of mind. Lol. Thanks for looking anyways guys.