1992 Dakota, 241K miles, have owned it 16 years. This winter, I had the instrument panel out for maintenance, and after I installed it, I noticed that after awhile of driving (sometimes 15 miles, sometimes 30, but not right away, never when cold), I'd hear a clicking, almost scraping noise from near the left rear wheel. The speedometer needle also bounces slightly, but NOT wildly, which it didn't do before. I figured I disturbed it and didn't get it installed optimally when I connected it again to the instrument panel, and that it might need lubing. The speedo and odometer work normally. Well, after awhile when it got to sounding loud enough to get people's attention at low speeds, scraping, I checked further and found CV grease leaking out a bad split in the LF axle. I had it replaced, but the noise remained. Sometimes I can drive 30-50 miles with no noise, sometimes after 5 miles. Today I checked codes, as I need to get rid of a code 12 from disconnecting the battery, before inspection. I found that I have a new code 15. Now I'm wondering if the entire time, the pinion gear to the speed sensor on the transmission, where the speedometer cable connects, may be damaged, and that's the scraping. Or I pulled the cable up enough to only partially engage it. Thoughts? I don't want to buy unnecessary parts. Thinking I should first try to reinsert cable.