Do you think the out of balance (destroyed) flex plate may have messed something else further downstream in the transmission or transfer case?Finally got this all back together and took it for a drive today - the vibration is much better, but it's definitely not completely gone. It no longer vibrates at all when I'm revving it up when it's just sitting in neutral, but now when I'm on the power above ~25 miles an hour there's still some shudder. It's still pretty much undriveable above 65 miles an hour due to that.
There's a lot of vibration coming through the steering wheel, so I'm going to start with replacing the tie rod ends, but after that I'm a bit stuck. I took both driveshafts in a couple months ago, they balanced the front and told me the rear was fine.
Since I'm not feeling any vibration when I'm revving it up in neutral anymore, I'm thinking that whatever is causing it is now downstream of the torque converter, so something drivetrain or chassis related. I'm going to also swap the fluids in the diffs, but I've had diffs go bad before and this is not what that feels like.
It doesn't have to. It's all about resonance frequency. I had a car that was smooth as glass until 80 mph, where it started vibrating, and kept getting worse the faster you went over 80. Which was annoying, since I liked doing 85 on the highway in that thing. Ended up being a wheel bearing in that case.It's possible, but hard to see how something could be that bad in the transmission or transfer case and not cause any kind of noise while driving, and not happen at lower speeds as well
I got new tie rod assemblies that I'm going to pop in today, but I don't expect that to have much of an effect. After driving it around for the last couple of weeks it still seems to me like there is some kind of rotating mass that isn't balanced properly, and because it only comes on at 25mph and higher it doesn't seem tire/wheel related.
I'm also experiencing TERRIBLE fuel economy. I know these discos are supposed to be bad, but this is probably around 7-8mpg if even that. I've gone 90 miles and burned through more than half a tank. Could this plus the vibration indicate that the torque converter is bad?
If I had a bad injector or injector harness I assume it would throw a CEL code?