Re: chattering gears in TH400? what is going on?
CJDave, you and Will are describing the way to shift the the transfer case,,,and I agree 100%,,,but what I read out of CJ8er's post is:.. he can't even shift into park, "with his engine running", without hearing the chatter. No mention of having the T-case in neutral while he's trying to shift., just that he couldn't shift the T-case without hearing it grind in the T-case as well..
I may have read to much into his post,,but my answer was based on the fact a very similar occurance has happened to me. What I found was the slide nut on the shift linkage had loosened and I was no longer making a complete shift, was kinda inbetween selections so I never quite got into park, and I would hear that ugly "the gears aren't meshing sound" A little adjustment and re-tightening the linkage and I was back in business.
Until I figured out what was wrong however, I would also hear that ugly grinding noise when I was trying to shift the T-case. If I recall, I had to shift the trans into neutral, shift the T-case into neutral, then shift the trans into park, before I could get the T-case to finally shift into low gear. Simply putting the trans into park wouldn't cut it, in fact in my case, I couldn't move the T-case lever from high to neutral with the trans in park. It wasn't until I re-adjusted the slide nut on the linkage that my auto shifted like normal.
Anyway, just some other info for what its worth...Its a real pain the shift the T-case into low when the Jeep is on some degree of incline/slope. If its possible, shift into low gear on fairly level terrain, before your in the rough stuff, it will save you a lot of "blue hazed" words later.