I recently Changed all the fluids in my Ford 1600 tractor. The other day my hydraulic lift wouldn't work at all and upon inspection I found the reservoir was extremely low. I also checked the transmission level and it was overfull and foaming. I filled the Hydraulic reservoir and it worked fine. However transmission fluid started running out as I was mowing. Somehow the Hydraulic fluid is getting into the transmission/rear end reservoir. I don't know how this can happen as they are separate units. I assume the foaming is coming from cross contamination of the two different fluids. Help!!!