I recently purchased a 1965 4020 powershift and am going to take the loader off my 4010 and install on the 4020. On the 4010 I feed a 3 spool valve from the port in front of brake pedal. The line feeding this port from the priority valve is a 5/8 line all the way to the 3 point rock shaft. On the 4020, this line is 1/2 all the way. Are all 4020s like this or just the power shift. the 1/2 seems to small to feed my 3 spool valve. Thinking about feeding the 3 spool valve from the 5/8 line that supplies oil to the priority valve. any thoughts on if the 1/2 line would supply enough oil to my 3 spool valve without restricting to much oil flow. seems odd that they would put a smaller line on the 4020. thanks for any help you could give me.