I have a 78 Nova that i thought had a 273 rear end but at 300 rpms im doing 70mph. The car has a th 350 trans and a 305 sbc. Does the rear end sound like a 308 maybe? The next question is why when i do a burnout does my drivers side tire spins and not the passenger? Sometimes i even get both wheels to spin like its a posi. Will someone help me with this im going to pull the cover off one day but would like to get an idea of whats going on back there.