Squeaky Motor Mount?

Several years ago I had an 05 that I chased a squeak on for over a year. Same thing that you are saying, turn the wheel one direction and it would go away, also driving in a good rain would make it stop after a awhile. Had the truck in the body shop at KW getting a new windshield, mentioned my problem to them. He climbs under the truck and says here's your problem. On top of the transmission there was a bracket that was bolted to it, it comes down the sides and is SUPPOSED to have little plastic bushings that bolt to it and ride on the lower flange of the frame rail. One of the plastic bushings was missing, and the bracket was rubbing on the flange. Removed the bracket entirely and never heard it again. They said that there is no reason for that bracket, that truck is still running today without that bracket, and has had no issues either. As a side note, I thought he was pulling my leg, it never sounded like a metal on metal squeak to me.

 

I started this answer and then looked at your avatar. Oscar the KW probably has the right answer for your since it appears that you run a daycab. Get a short piece of silicone hose to put between the mount and the the 'leaf spring'.. It doesn't need to be big enough to over the spring because you are going to slice it lengthwise. To get the hose to stay on the spring you will put 4 small slits in it. These will be big enough to slide a poll tie through. With the piece of hose flat slide one end of the tie through 1 hole under the hose. The tie then goes over the to of the hose. Then go through the second hole going under the hose. Do the same with the second tie. The pull ties will run perpendicular to the spring. The center section of the ties will be on top of the hose and under the spring. Put this on the spring and pull tight. Do the other end the same way. Reinstall the spring. I hope this is understandable because it is hard to put into words. You may have trouble keeping the passenger side on. You might need to do it 2 or 3 times. If you don't understand my instructions and want to do this send me a pm. I will explain it as you are cutting, slitting and tying.
This is another possible source of a squeak if you have an aerocab with a sleeper. This fix is a s.o.b. to do. You will think I am crazy when I tell you what it is. Disconnect the rod from the valve that controls the height of the sleeper air bags. Raise the sleeper to it maximum height. You only enough air to get it up there. Now put blocks between the sleeper and frame rails. Next pull out 1 bolt holding the sleeper shock. Put never-seize on it and reinstall. Do all 4 bolts holding the shocks. You will need no less than 1 six pack to get the top bolts back in. If you have eyes on the end of your fingers that is a definite plus. Remove the blocks and lower, the sleeper and reinstall the rod. Now you can get fall down drunk. I chased this squeak for years before I figured it out. A buddy of mine did the same procedure. He wanted to kill me before he drove the truck and found his squeak was gone.

 

If you know your motor mounts need replaced, take care of those first. They may be squeaking, or allowing something else to rub and squeak. Then get those sleeper shocks. I definitely second the anti-seize advice, any time you're doing shock absorbers.

 

Wow! I thought I was the only one to have that problme. I 2 fought that #### squeak for several years and finally my fix was to take the spring off the back of the tranny. Then I put a peace of 2*2 square rubber mud flap on the end of the spring that rubs inside the frame rail. ( used a little RTV black to hold in place) and to this day no squeaky. Yay for me cause that was very annoying.

 

as a few have already mentioned. that bracket on the trans is called a slap spring. those little donuts don't last that are riveted on the ends. I don't recommend removing it like some have. the way I have fixed it is to remove the two pcs of angle iron it rest on and cut a strip of plastic mudflap about 3inches long and 1 1/2 inches wide and bolt to the angles for the slap spring to rest on. they will never wear out again. the new motor mounts will cure it for a while but after they (settle in) the squeak will come back. now think about that slap spring being removed. it helps support the trans to some degree. without it there is a lot of stress put on the bellhousing and bolts. plus the new motor mounts you installed. what is cheaper two pcs of plastic mudflap you have laying around or replacing mounts or bellhousing bolts or bellhousing every few years that cost $$$.

 

There is no way that slap spring provides any kind of meaningful support. It's nothing more than an abortion of an idea from some engineers over complicated thought process.