Yes, the crack is on the front axle. Not 100% sure about all the details on the 80 but it would have a bigger ring and pinion (the main reason to want it) and therefore, the differential housing would be bigger just like the PR80 but who's to say if or how much stronger it would be.That’s what I thought too. This is the front correct? I thought I saw a tie rod in there but everyone kept saying 80 so made me second guess myself.
Also isn’t the 80 the same cast housing just slightly bigger? It’s not necessarily stronger at the pumpkin right?