I have an early 90's 4630 MFWD with a bad front axle. It looks a though the axle has been replaced previously, possibly with an incorrect part. There is a "FWD Factor" of 1.3652 located on the tractor's data plate. Could I use this to determine the original specs of the front axle, or is there any other way to determine from the Serial or anything else what axle specs the tractor came with from the factory? Thanks