So i just bought an 84 3+3 1 ton (40.5" sprimg perch span). The truck came with 2 14 bolt axles from a 3/4 ton (42.5" spring perch span) one with 4.56s and on with 4.10s. Im not sure what gearing im going to need when all is said and done with my build and i need to get an axle mounted so im...