Members: am hauling creek rock (from pile) w/'FELs on 7040 4wd. being dense material, as I approach for the bucketfull (low 1st gear 4wd), the tractor comes to a stop and the front wheels spin a bit as I raise the FELS. I'll immediately depress the clutch, etc. and proceed. A K tech informed me this will not put excessive stress on powertrain/ clutch, ect. and he mentioned to use the differential lock in that sit. I thought it was only for rear axle use? any feedback on the effect on tractor & diff lock use ? don't want to press the machinery, but need to get 'er done.....thanks in advance .bb