Re: Navigator Transmission Thumping?
I know the front bearings are bad, but that's not sound/ feeling this is causing. This bumping, which is more feeling than sound, specifically only happens in 4th gear at low rpm on a slight incline. The only way to pass through it is to give it hell on the accelerator. It's not a constant bumping over and over, but a few hard enough bumps to startle you.
Would worn out plugs cause something like this? It's coming near time to replace them, but I just feel this is something else.