7.5 or 8.8 ???

this may be a dumb question but , I have an 85 notch 4 cyl that has been converted to a 91 5.0 carb'd. I'm not sure if the rearend got changed in the swap. is there an obvious visual difference between the 7.5 and 8.8 ?? please help ... :shrug:
 
unless it's missing, there should be a tag on the rear end, will have some numbers indicating the gear ratio, then 88 or like 75 etc on it.

real easy to desipher them, you'll understand when you see the tag.