Trading a 47 blower, upstop and driveshafts and some cash next week for a 40 loader and I have some questions. How hard is it to install the sub frame away from your garage or would it be easier just to strap the loader down on the trailer and go? Does the subframe mount to the outside bolts on the rear axles or does it use the holes that secure the transmission to the frame? Also on the transmission relief valve, there are two different ones AM121248 which is listed in the 425 parts catalog and is $286.98, the other which is listed for the 45 loader and 2wd tractors which is BW15043 and costs $152.57. Now I know they are different tractors, but they have identical part number matching transmissions. Both of the relief valves replace the factory valve AM882548. Any reason why the one for the x series would not work?