Dave F. wrote:In Ken Updikes book, Farmall Cub and Cub Cadet, on pages 38 and 39 it shows one with a red grill screen and one with a white grill screen.
I take it you are just talking about the screen, not the stamped part of the grill. I think the picture on page 39 just appears to be red, a quirk of the lighting. Grilles of that period were all white. IH painted it in one shot after the screen was assembled onto the grill.
I believe the official line from the paint committee was that weights were to be painted the same color as the wheel disk behind them. So at that time Farmall weights would be red and Lo-Boy weights white. As you might well imagine, if somebody went to the dealer for weights, they got whatever color the dealer had on hand.