I have a 1991 GMC sonoma with the 2.8 V6. Its a 5 speed tranny and the throwout bearing went out a while back. I got a guy to put it in for me but now it still has a loud whining coming from the tranny when going down the road. when sitting still it sounds like its free spining or something. I was told that he might not have installed the pilot bushing in. If this is so how long can I drive it before it goes out again??
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Re: 1991 sonoma clutch question
DO NOT DRIVE, get the vehicle to a transmission specialist it sounds as if a bearing has failed in the transmission. these units have a habit of exploding through the case. If this happens a very expensive new unit is required. second hand units are as rare as rocking horse *?$!.
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ooh this sounds bad your gonna have to remove the trans inspection plate and look to see what got damaged with light squeaky throwout bearings are a warning of bigger things to come could be a total failure of clutch packs and pressure plates
If you have already gotten all the air out of the system, you may have to remove the clutch assembly and check the finger height compared with the one you removed as some designs are lower or higher than the original. You can either try to find one that matches the old one or change the throwout bearing (they come in several heights)...In your case I'd use a longer one. The transmission has nothing to do with clutch release height and the only part it plays in clutch operation is that the neck on the front cover acts as a guide to stabilize the throwout bearing. (always make sure there is a light coating of grease on it so the bearing does not seize on there when in use.)
Changing the clutch or throwout bearing in a rear wheel drive is one of the easier things to do. Having it on a lift is nice but it doesn't have to be. The truck needs to be high enough to get under and work. Needs to be on jack stands or blocking sturdy enough to hold the truck steady. Do not use ramps. Remove the drive shaft, making sure the caps stay on the U joints. remove the shifter from the transmission. Take the slave cylinder off the trans., the stater, and then the transmission from the engine. You will need to support the motor in place so that it doesn't tear up the radiator or the firewall depending on the balance point. Take the trans down by pulling it back about 3 inches. Use a jack or 2 people to do this. Transmission is somewhere around 100 lbs. On the back of the motor you will see the pressure plate held on to the flywheel with 6 bolts. Take the pressure plate off and the clutch is between the pressure plate and the flywheel. The flywheel may need to be resurfaced or you may just clean it up with coarse sandpaper. The clutch disc goes in one way with the spring assembly facing the rear of the truck. There should be an alignment tool with the clutch kit. The clutch has to be centered on the flywheel. If there is no alignment tool provided, you can center it by making sure the clutch disc is even with the edge of the pressure plate all the way around. Usually, the clutch is just a little bit smaller diameter than the pressure plate.
The throwout bearing is on the shaft coming out of the transmission. Should be held on by a fork that sticks out through the bell housing. After the throwout is replaced and you make sure it has free travel on the shaft reinstall the transmission. You may need to wiggle it a bit to get the splines on the shaft and the ones in the clutch to line up. Make sure the transmission is held straight so that the shaft in the transmission doesn't get bent. Slide the trans. to the motor and onto the alignment pins and bolt in place. Reinstall everything and you are done. Thank you for using Fixya and since your going to replace the throwout bearing, you might as well replace the clutch since you have the transmission away from the engine to replace the bearing. Good luck and be safe.