Hello, I have an 86 f350 2wd 460 with the c6 and 10.25 rear end dually. When driving at about 10-35 mph when on the throttle there is a whine noise coming from what sounds like the rear end. The second you let off the throttle the noise goes away. But when you get back on the throttle the slightest amount the whine comes back. Starts to go away the faster you go weather you are on the throttle or not. No other weird noises. Could it be the wheel bearings? or worse the pinion bearing? Where can I get timken wheel bearings for the truck? Thanks

 

My F350 rear axle whines at certain speeds because of the carrier bearing.

Rock Auto used to have a decent selection of this kind of stuff but I haven't looked in about 10 years so you should go check & see.

https://www.rockauto.com/

 

Those rearends are famous for the splines wearing some on the pinion shaft and the yoke where the driveshaft hooks up. Put blocks on the tires so it will not roll, and take the truck out of gear to release the driveline. Get under there and grab the rear u-joint and try to move it, and see if the yoke on the rearend moves. You may also see some oil leakage. If it's loose, you need to take the driveshaft loose at the rear, and tighten the large nut in the center back up.

 

Thanks for the info, will have to check that out, another question for you since you seem to be very knowledgeable. My rear main and oil pan leaks a decent little puddle. All my other vehicles I have are manual trans. How much of a pain is it to just remove the motor without the trans? Dont you have to take out the torque converter bolts? Are they usually trouble free getting them out? Or would it be easier to pull the front clip and remove both trans and engine? THanks

 

The engine will come right out with the trans in place. You take the shield off the bottom of the bellhousing, and put a socket on the front of the engine crankshaft and turn the engine around till a torque converter bolt comes up. Take it out and turn the engine some more till the next one comes out. When you get them all out, the torque converter will slide back a little bit, not enough to come completely out but enough to know it's loose.

You have to take all the obvious stuff off the engine, and the radiator also. Take the long motor mount bolts out, and then hook to the engine and pull it up as high as it will go till the trans hits the floorboard. While it's up there put a flat piece of wood under the trans pan and a jack of some kind, and jack that up to hold the tranny up in the high position (don't worry about the rear trans mount, it will give enough to let the front of the trans point up).

When you have the trans supported up high, let down on the engine just a hair to take pressure off the bellhousing dowel pins(you have already taken all the bolts out) but don't let it down too far or the motor mounts will interfere. Go up and down and wiggle it forward and it should come loose from the trans.