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Counter shaft bearing has failed inside the transmission.
You have to be able to pull the old bearing and replace it with the input shaft in place (it takes a special puller and installer). Not being able to do that (like me), the transmission needs to be almost totally disassembled to remove the shaft/bearing from the case. There are clearance issues with the countershaft and mainshaft that cause this. If you go that way you still need a bearing splitter and press to get the bearing off and press the new one on. Because you have taken the front cover off the transmission, you will have to do some shimming between the case and outer bearing race.
You remove the transmission from the vehicle. The throw out bearing is the bearing around the shaft that goes through the flywheel when the transmission is installed. The bearing clips in easily and is held in place because it goes around the shaft, and the clutch release arm can only move in and out, so the bearing will never be displaced during typical use. Removing the transmission is a big job, and you might as well replace the clutch while you're in there, unless it's already new.
Hopefully you know how to do everything to get to the half shaft. There is a bolt at the bottom of the bearing on the shaft so remove that bolt. Remove the retaining ring in the bearing. Try prying with two pry bars but if that does not work take a mini sledge hammer and beat it out. The problem is usually the bearing. The bearing seems to be aluminum and the bracket is steel and they bond together. Watch the bearing as you pound and you should see it begin to move and the shaft will pop out of the transmission. Clean the bearing housing and coat with anti-seize and align the new shaft in the transmission (align the splines on the end of the shaft with the splines inside the tranny). I take a piece of wood to cover the end of the shaft and gently tap the shaft until it pops into the tranny. Now put it back together. Just make sure the shaft is totally seated in the transmission by watching the bearing location as it enter the bracket it sits in.
It is the same thing as a pilot bearing. Goes into the rear of the crankshaft to support the input shaft of the transmission.
there is no front shaft in 63 impala Wrong answer, it's about two feet from the transmission to the carrier bearing
undo the hub nut in centre of wheel it is very tight so a long bar required. Undo the balljoint so the the strut can move freely and then just pull on the hub and the shaft will pop out of the transmission depending on the shaft you will have to undo the bearing carrier but this is on the long shaft not the short one.
on the blower most bearings are flange mount, and will have a Allen set screw locking the shaft to the bearing,
It slides over the transmission shaft that goes into the pilot bearing on the back of the motor. The transmission must come out and then you can access the slave cylinder which will be held on by a couple bolts. Once the transmission is out the slave cylinder (which most of the time comes with a new throw out bearing) will be easy to replace. Its not too bad of a job.
If you are asking what a clutch shaft is related to the installation of a clutch, it is a plastic alignment shaft that is used to line the clutch disc up with the pilot bearing in the flywheel, so that when you install the transmission the transmission input shaft will slide thru the clutch splines and into the pilot bearing in the flywheel with relative ease. They are a must for any clutch installation!
The spigot bearing AKA clutch pilot bearing, is the bushing that is pressed into the back end of the crankshaft and supports the input shaft of the transmission.
The slave cylinder is on the input shaft of the transmission at the throw out bearing. The transmission will have to be removed to change it.