Not all 8.8 s have 3.73 some are4.10 s some are open 3.55 the ones that are 3.73 /4.10 have 31 spline axles , the 3.55 have 28 spline, you can usually pick one up for around 200$ , keepin in mind you shorten long side tube and use short side axles in both sides, can run you a few bucks depending upon how deep you want to go .
