Any history we should know about?
When you say half, are we talking an
Overdrive ?
Have you since buying it, checked fluid levels? Or changed fluids?
Im assuming new to you? Not sure... Forgive the following if wrong
Can you tell for sure the noise is coming from the tranny? Noises travel in these things... Hard to tell sometimes. I had a noise in my tranny a week ago, figured out my seat bracket bolt had come loose... No more noise...
My guess, though i hope not, would be possibly the tranny input shaft bearing... Or the piolet bushing... That i know of theres no real way to know that without pulling the tranny... So those would be the last thing id check...
So what i would do ( im not an expert...) is assume maybe the noise is elsewhere or hope anyways...
Id start with repacking wheel bearings. Might not be the problem, but good to do and doesnt cost anything but time, a tub of grease, and purchasing the hub tool that you will be needing eventually...
Then id grease all u joints on everything... Again from your desription i dont think it will be the demon, but it wont hurt and if it hasent been done by you yet, who knows when PO did it last...
After these id take for a drive, hope no noise... Then id probably, again for peace of mind, change tranny and
Transfer Case fluid (dont know much about overdrives... Fluid share??), and again if me, the front and rear end fluids, inspecting the gears while in there with cover off...
This will all cost you in gaskets and fluid id estimate around 100 bucks, and a saturday...
Then drive again see if gone
But then again i said im not an expert so id also wait for another member or two to reply before doing this...
dont want u to be upset when none of the above helps... Or when you pull the tranny and it had nothing to do with it
Just some 2c input is all ...
Hope you get it figured out man... Try to find some info on your drivetrain too if u can. We can help you id your componates so you'll know what you have...