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I think you have a bearing out. The 1st - reverse gears are at the back end of the countershaft and since you don't hear the noise in low gear, it will be one of the front transmission bearings of which there are 4: 1) The pilot bearing as mentioned in an earlier post, 2&3)The two driver (input) shaft bearings, or 4)The countershaft front bearing. Fortunately, all of these bearings can be changed without removing the top deck or splitting the tractor. Just drop the Liftall pump and remove the drive shaft. Drain the transmission oil next. It will only be necessary to remove the front plug which means you probably won't need more than a 5-gal. bucket. Since it is the easiest to get to, check the countershaft bearing first. Remove the slotted Liftall driver (right-hand thread) and take the oil seal housing off (3 screws). Thread the driver back on the shaft and wiggle and listen to it to see if that is the source of the slop. If you hear the familiar clunk, you've found your problem. This bearing has an external snap ring on the outer race which doesn't need to be removed. Instead, use it to help you work the bearing out. There is a snap ring at the other end of the shaft so you don't have to worry about pulling the shaft out of place. To get to the pilot bearing, which is your next suspect, remove the input driver shaft housing. You don't have to remove the front yoke to do this. Just take out the 6 or so cap screws on the housing and pull it out straight forward. Looking inside the transmission, the pilot bearing is on the end of the shaft. It is a roller-and-cage type bearing. The shaft and the inside of the constant-mesh gear you just removed serve as the bearing races. Inspect all surfaces and make sure all the bearing rollers are there. It is easily removed when you take the bolt out of the end of the shaft. This bearing is uncommon and unless you have a very knowledgeable local source, go to Case/IH. It will help if you don't go on an empty stomach. The other two bearings are in the housing you just took out. Check for excessive slop. This can cause a lot of growling noises - even in neutral since it always drives the countershaft. If you have to take it apart and the yoke is stuck tight, put a spacer or short socket on the end of the shaft and use the long clutch shaft with a couple of 3/8" bolts to "pull" the yoke off. If there is any sign of leakage, replace the seals. Gaskets are available from Case/IH. If they are the 63 year old originals, it is recommended.
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