would increased horsepower blow out a rear pinion seal? I have noticed a small vibration on the highway which i believed was the driveshaft. I think this may have confirmed my suspicions of this possibly causing the seal to now leak. I am putting out 535 HP at the rear but i don't believe that is the reason this happened. any ideas?

 

might wanna replace that aluminum driveshaft with a steel driveshaft (if you have an aluminum one anyways)....aluminum driveshafts are somewhat known for throwing weights and becoming unbalanced so it could be possible i guess

 

Should not have hurt the seal. Dodge rears are bad for a few things, one of them is the seals. I had a GC that was dripping at 69K.

 

Mine started leaking at around 11K.