I saw that auction with the 450 series along with a government specced 424, but I decided it was just too far to haul to TX. I was tempted though because there are some good paying flatbed loads from Texas to the Pacific Northwest. But I would have probably had to hire a wrecker to retrieve the 2 units and then to load them on a flat with no ramps. You have a Clark which was very popular in the 50's. What Scott is describing is what we called a working 5th. It is a transmission with close ratios between 4th and 5th. If you do not have the close ratio between 4th and 5th, it will shift 4th lo, 4th hi; 5th low, 5th hi. There should be a tag in the glove box and a tag on the transmission that will give you a model no. It could be a 205V or 207V which are direct or a 207VO which is an OD.