my NAA is back together and working after new axles, hubs and a repaired lift cylinder. except now with clean oil and the correct amount of oil the pto seal is leaking. toying with the idea of changing it to the 1 3/8" shaft. is it as easy as pulling four bolts sliding the old one out and sliding the new one in? or is there more i should know? i know i could just replace the seal but the shaft is bent as well.