When driving, get a squeak as the driveshaft rotates

[G-NUT]

I have a 1988 700r4 that I bought recently from a salvage yard. I replaced all seals, filter, installed the Transgo SK-700JR kit. Seems to shift and work great but I have this squeak. It's a 2-piece driveshaft (3 u-joints). I replaced the rear u-joint. Still squeaking. So I got the burn on jackstands, got underneath, shifted to N, and rotated the driveshaft by hand. It's definitely coming from the forward area. It could be the front u-joint but it really sounds like it's coming from the transmission tailshaft area. When I was resealing the trans I had the tailshaft housing off because I replaced its seal as well, and inspected the shaft, bushing, and speedo setup.

Still looking for the source of my sqeak.

[Ziegelsteinfaust]

Did you oil the shaft before you slide it in?

Also the center support bushings can squeak.

[AussieinNC]

More than likely its a uni joint thats dried out....if they have grease nipples, give each one a shot of grease until it comes out of the ross seals...

There is little chance the issue is inside the trans...

I would also make sure the center bearing is not partially seized and noisy.....

[G-NUT]

Originally Posted by AussieinNC

More than likely its a uni joint thats dried out....if they have grease nipples, give each one a shot of grease until it comes out of the ross seals...

There is little chance the issue is inside the trans...

I would also make sure the center bearing is not partially seized and noisy.....

I replaced the rear u-joint with a new heavy duty unit that was pre-packed and had a grease nipple. I provided additional grease, the recommended stuff from the GM manual.

The center u-joint and front u-joint do not have a grease nipple. I should have replaced them when I had the d.s. out but didn't. Now I'm trying to avoid removal again.

Also, when doing all my suspension work I replaced the center support bearing with Inland Empire Driveline high impact polyeurothane unit. https://www.iedls.com/Our_Difference When I unbolt it and lift up the d.S. it spins very freely, without drag, resistance, or noise.

[G-NUT]

Originally Posted by Ziegelsteinfaust

Did you oil the shaft before you slide it in?

Also the center support bushings can squeak.

I did lube the seal and the driveshaft before installing. Hard to type that without laughing.

I should have lubed with trans fluid but I actually used petrolium jelly (vasoline)