You need to use the clutch and the shifter smoothly together!
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).
I'm going to assume its an automatic transmission. Is the millage higher than 50,000? If so try changing the transmission fluid.
Check the transmission fluid level, be sure it is at the full line. A worn out universal joint could be the source of the clunking noise when the transmission is shifting.
gears kicking, lots of whining noise??
check the fluid in the rear end it might be dry causing medal to grind causing a clunk noise or the gears in the rear end or worn done causing it to do the same thing
The noise is due to bad gears or bearings in your rear differential.
Counter shaft bearing has failed inside the transmission.
Internal transmission failure.
a clunk noise over bumps
No idea,same car same thing and trying to find the answer myself ?
A clunking noise when shifting gears on a K1500 automatic transmission, might mean a problem with the drive axle or drive shaft. Check all U-Joints to make sure they are working properly.
They could squeak, rattle, bang , clunk.....