Squeak in trans

[42967Cad!]

I have 67 Deville convertible. The trans is totally rebuilt with new torque converter. I have a squeak coming the trans. I jacked up the rear wheels on my lift thinking it was my brakes but when turn the drive shaft the noise is coming from inside the trans. It's almost sounds like rubber rubbing,but when turn the driveshaft the opposite way which would be in reverse there's no squeaking
I pulled the torque converter cover can't see anything. Any ideas?
Jim Beam Elmore Oh

[Dave Shepherd]

Usually this is caused by the sprag in some units. It can be heard, engine off, turning the drive shaft by hand. You shouldn't  hear this driving or engine running.

[42967Cad!]

I've been told that but when I'm driving the car you can hear it ,especially when you cross a bridge with barrier walls. It's real loud!  I let my son drive the car and I had my head out of the window and it squeaks really bad.

[Dave Shepherd]

Get the rear wheels of the ground, safely support the car, put it in gear and listen to confirm it is the trans., if so something is wrong internally.

[42967Cad!]

I've did that and it sounds like rubbing 2 pieces of rubber together,only has about 200 miles on it! I called the guy who rebuilt it and to drive till it fails. I don't do things that way.  It's a 1967 Deville that is like brand new I'll probably have to pull it and get it redone again!  Been around cars and trucks all my life never heard that noise coming out of an automatic. Thanks for the comeback,I'll post when I find out the issue. Jim Beam Elmore Oh

[wheikkila]

I would look at the u-joints. They can make some noises.
Thanks Wayne

[Clewisiii]

Yes I would question if it is in trans or the drive shaft connection to trans.

[Julien Abrahams]

Are you sure it is inside the transmission? I would also carefully listen to the u-joints.

[The Tassie Devil(le)]

When a Universal Joint goes bad, before it starts to rumble, it emits a clicking sound as the rotation is taken up, and the needle rollers click into the various grooves that are being worn into the surfaces of the cups or pinions of the cross part of the joint.

Bruce.

[Chopper1942]

The two most common u-joint failures are lack of lubrication and brinelling of the trunnions. Brinelling is caused when there is little movement in the u-joint because the u-joint angle is very close to 0 degrees. Even though the roller bearings have adequate lubricant, the rollers make indentations in the trunnions. This will cause a P1 or P2 vibration which is felt inside the vehicle.

In the second type of failure, the u-joint cap either runs out of lubricant and the needle bearings run dry or a seal fails and lets water into the cap. In both cases, the rollers become rusted. When this happens, the joint will usually squeak before the needle bearings break-up and start clunking when you change from forward to reverse. Many times the squeak is first heard when backing-up and makes no noise when going forward.

You can inspect the u-joint cap seals where they seal on the trunnions. If there is a rusty ring around the seal, it is probably dry and is causing your squeak.

The best test is to remove the driveshaft and work each joint back and forth. Any stiffness or roughness during movement means the u-joint needs replaced.