Never said I was "alone in it". Seems like you're getting worked up and jumping to conclusions. When you say "not willing to take our word for it" I don't know you are referring to because I never implied anyone was lying.Cool, but you're not alone in this. Going straight is where you'll be most likely to do that. Going in a turn at low speed is where it's most likely to do a one-wheel-peel since the weight of the car is transferred to one side; if the inside wheel loses traction, then that indicates an open diff or worn out clutches.
If you're not willinng to take our word for it, you're going to have to yank the cover and look inside the pumpkin - no other way around it. The tag, door code etc. all point to an open rear.
If you can't explain why an open rear end will spin both wheels when going straight, then no hard feelings. I was just curious.
By the way, I've driven many different rear wheel drive vehicles over the years of different makes, eras and with different types of "Posi" "Limited Slip" "Trac-Loks" or whatever unique word manufactures want to call them, none of the ones I drove with open rear ends had the characteristics of this one, this is new to me.
To be clear, I'm not implying I have Trac-Lok, as a matter of fact, I'm still leaning towards not having it.
As far as taking the diff cover off, I already mentioned that in post #39.