bad synco rings
You will feel a definite high speed vibration when driving. And you'll hear a very distinctive "clunk" when shifting from drive to reverse or visa-versa.
If the ticking is in time to wheel speed and most noticeable on turning I would suspect an outer CV joint. An inner axle joint might clunk when shifting into reverse. Maybe they're on the same axle. Other possible causes of clunking are worn-out motor mounts.
The rubber isolators in the engine mounts have worn out or the CV joints in the drive shafts are worn out.
sounds like a motor mount is loose or needs replacing
Are you sure it is the transmission that is clunking? It could be the u-joints on the drive shaft that are making the noise. When the u-joints on the drive shaft are bad, there is an audble clunk when you accelerate and when slowing down (basically the same motions you go through when shifting gears).
Loose universal joint(s) in drive train.
It could be several things-worst case is your transmission is shot. Have you checked the tranny fluid level? The transmission may just need to be serviced(new filter and fluid, easy fix. Could be the torque converter, tranny bands, or rear end. Have you had any problems with it before? Mine would hesitate when put in R, then kind of clunk into reverse and finally no reverse at all
sounds like a motor or transmission mount is your likely problem
YOU WILL FEEL A CLUNK WHEN THE VEHICLE IS PLACED IIN REVERSE OR DRIVE AND IS ACCELERATED WITH THE BRAKES DEPRESSED
It could be that the transmission fluid is low, or it could be that mechanical parts have worn down. If so, it may be time for a replacement.
Worn trans or diff parts. If it gets worse, have it looked at.
broken transmission mount there is a front left, rear left and a center mount