4-150 can be a good machine as long as all updates have been made to it. It was a real step forward when it came out as the first &amp;quot;row crop&amp;quot;able articulated tractor. The main updates were to the quill shaft support (the shaft between the clutch and the over/under), and the hinge area (pivot ball, and steering &amp;quot;w&amp;quot; mamber). If there are no front mounted attachments get a large friend and have him push up and down on the very front of the nose while you watch the center pivot for movement. The updated ball was in the lower casting and was held in by 4 bolts as I recall. If your local AGCO/White dealer was around then he should still have all the bulletins you can check them out, and he may have even performed the updates on the machine you&#039;re looking at. The two bigest differences between the 4-150, and 4-175 are an improved center hinge (even beefier than the updated 4-150), and they went to the big over under like in later 2-135/155 (six qt. oil capacity), the 1-150&#039;s was internally the same as the earlier/smaller ones(4 qt. oil capacity) which is really over its head trying to handle HP and &amp;quot;snappyness&amp;quot; of the CAT. There are some who detract the 3208, but the one in my 4-175 has given me no trouble, and we sold many 2255,4-150,4-180,4-210 with them in, and if the owner did his part they held up well. The &amp;quot;throw away&amp;quot; that people talk about stems from it being designed to be removed and replaced with a re-man rather than being overhauld by the average shop., There are other differences as well, but this should get you started. Just try and find out the history on the one you&#039;re looking at.