Alright, so I've had my 82 D50 with a 2.0 for a few months now and it's not given me any problems, but I'm careful about how fast I've been driving it to work because I'm not sure how fast I can safely go without causing any damage. It's a 4 speed manual and I travel about 75 miles a day and 99% of it is highway. It didn't have a tach, so I wired one in and when I'm going 60 it's showing around 3,200 RPM's. Truck didn't have a factory tach, so I'm not sure where the redline is to judge how fast I can go without running into an issue of overheating the oil or foaming up the oil. Anyone have some info for me? Thanks in advance!