I recently bought a 1971 Mercury Colony Park that's a bit of a time capsule. I think it sat in the garage for about 20 years. Before that it had a period of going to shows. It had a leaking pinion and wheel seal. It's 2.70 Traction Lok axle. The first 3-5 miles I drove it, the diff seemed normal but at this point, it's like driving with a detroit locker that won't disengage properly. I pulled the thing apart expecting to find a smoking gun but, everything rotates freely. The gear oil was especially sticky with a horrible rancid smell (and I like the smell of gear oil) I've been around plenty of old LSDs that didn't do much of anything. I've never seen one act like this. As far as I can tell, tires haven't broken loose while turning but the action is violent, it feels a lot like the worst moments with a detroit locker. There's no chance of getting differential action while spinning tires by hand. Has anyone had the same experience? I suppose at this point I'm inclined to clean it up, reseal (and probably re-gear), and put it back together with clean oil. I could change clutches but... they look pretty good (and I imagine I would then have to re-shim).