7.5 and 8.5 will fail the same way, the Pinion comes loose and from there it's wrecked. Seen quite a few like that in the GM 1/2 ton trucks. 7.5 will fail much sooner, just won't take the abuse as mentioned. I've had my fun with them.
400whp LT1 in my 1995 Z28 took the stock 3.42's for a run
Upgraded to 3.73's and an Auburn Diff. 500whp LS Engine this time with a 1.55 60ft on the prevoius pass. Dropped tire pressures 1psi and firmed up the Coil Overs by one click..
9" and T56 went in after that. Then broke the car. 🤣