I just finished pulling out my old collar sleeve and re-installing the two new seals. When it came time to clean up the actual angle gear, I noticed what appeared to be worn splines. The splines on the very outer edge appear normal on the angle gear. However, about 6 mm down the shaft, the splines appear to be worn down. You can actually feel this with your finger. I assume that this is not normal and was caused by my worn collar sleeve. I assume that it is time to find a used angle gear as this is not normal? ALso, how much force should be required to fit the new collar sleeve on the transmission output shaft. Should it slip on, or does it require force via a rubber mallet? Mine seem awfully hard to push on. ANy help or suggestions would be appreciated.