Toyota 37100-0C154 Propelle Shaft Assembly W/Center Bearing

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A driveshaft is a tube or a pair of tubes that transmit power between the transmission and the differential. Universal joints are located at either end of the driveshaft, and a third U-joint is employed just behind the center on two-piece driveshafts. The driveshaft is attached to the rear differential by a companion flange. On 4WD models, the front driveshaft is attached to the front differential in the same way. Driveshafts on 2WD models employ a splined yoke, known as a slip yoke or sleeve yoke, at the front, which slips into the extension housing of the transmission. This arrangement allows the driveshaft to slide back and forth within the transmission during vehicle operation. An oil seal prevents leakage of fluid at this point and keeps dirt from entering the transmission. If leakage is evident at the front of the driveshaft, replace the oil seal. On 4WD models, each driveshaft is attached to the transfer case by a companion flange. Once a front or rear driveshaft has been removed, either companion flange can be removed from the transfer case to replace the companion seal(s). On two-piece driveshafts, center bearings support the driveline. The center bearing is a ball-type bearing mounted in a rubber cushion attached to a frame crossmember. The bearing is pre-lubricated and sealed at the factory. On two-piece driveshafts, a sleeve yoke is employed in the rear driveshaft section. The driveshaft assembly requires periodic lubrication. Since the driveshaft is a balanced unit, it's important that no undercoating, mud, etc. be allowed to stay on it. When the vehicle is raised for service, it's a good idea to clean the driveshaft and inspect it for any obvious damage. Also, make sure the small weights used to originally balance the driveshaft are in place and securely attached. Whenever the driveshaft is removed, it must be reinstalled in the same relative position to preserve the balance. Problems with the driveshaft are usually indicated by a noise or vibration while driving the vehicle. A road test should verify if the problem is the driveshaft or another vehicle component. If you suspect trouble, inspect the driveline.

To properly lubricate your vehicle, you will need a grease gun, clean rags, engine oil, chassis grease, lithium base grease, spray-on graphite or silicone lubricant. Begin by raising the vehicle with a jack and placing jackstands under the frame for easier access. Look under the vehicle for grease fittings on the driveshaft universal joints and slip yokes. Wipe the area around the grease fitting clean and force a little grease out of the nozzle to remove any dirt. Squeeze the trigger on the grease gun to force grease into the component until it oozes out of the bearing cup seals. Wipe off excess grease and repeat the procedure for the remaining fittings. Lubricate the driveshaft slip yoke by pumping grease into the fitting until it comes out of the slip yoke seal. Clean and lubricate the parking brake cable, cable guides, and levers with chassis grease. Lubricate the contact points on the steering knuckle stop with lithium base grease. Smear chassis grease on the hood latch mechanism and lubricate the cable at the latch. Lubricate all hinges with engine oil and the key lock cylinders with spray-on graphite or silicone lubricant. Finally, lubricate the door weather-stripping with silicone spray to reduce chafing and wear.

Raise the vehicle and securely support it on jackstands. Place the transmission in Neutral with the parking brake off. Block the front wheels to prevent the vehicle from rolling. Using a scribe, a hammer and punch, or paint, make marks on the driveshaft and the differential flange in line with each other. This is to make sure the driveshaft is reinstalled in the same position to preserve the balance. Remove the bolts securing the flange yoke to the rear differential. Turn the driveshaft as necessary to bring the bolts into the most accessible position. On vehicles with a two-piece driveshaft, remove the center bearing protector and remove the bolts, nuts, and washers from the center support bearing bracket. Lower the rear of the driveshaft. Slide the front of the driveshaft out of the transmission or transfer case or, if equipped with a companion flange, separate the flange at the transfer case. On 2WD models, wrap a plastic bag over the transmission extension housing and hold it in place with a rubber band. This will prevent loss of fluid and protect against contamination while the driveshaft is out. Remove the plastic bag from the transmission or transfer case and wipe the area clean. Inspect the oil seal carefully. Slide the front of the driveshaft into the transmission (2WD models) or bolt the U-joint flange yoke to the companion flange, installing the fasteners finger-tight (4WD models). Raise the center bearing (if equipped) into place and screw the retaining bolts in a few turns. Raise the rear of the driveshaft into position, checking to be sure the marks are in alignment. If not, turn the rear wheels to match the pinion flange and the driveshaft. Tighten all nuts. Remove the jackstands and lower the vehicle.