Driveshaft question (1 Viewer)

[COS80]

IME brushing Moly lubricant (LB8012) on the slip yolk splines followed by fully greasing the splines would not cause a squeak, the purpose of the Moly paste is to prevent metal-to-metal contact but it should not be used by itself ie: you must also grease the splines. The purpose of adding the Moly paste IMO/IME is to "boost" the long term protection of the splines. If greased correctly there shouldn't be any noise coming from the splines assuming they are in good shape.

To ensure the splines are fully greased (and not overgreased) you can first pump grease into the slip yolk until you see the shaft extend, then remove the zerk fitting (?7mm socket), watch for air or grease to come out, then go for a short drive with the zerk removed, any excess grease will be pushed out the hole, then replace the zerk fitting.

Do not use the (LB8012 65% Moly) Moly paste in the U-joints.

As mentioned above, if you think the noise is coming from a driveshaft one method to help determine the source is to engage the Emergency brakes, remove the shaft in question, lock the CDL, then drive the vehicle to see if the noise is gone. To lock the CDL (if you haven't done it before) first start the vehicle, shift the transfer case to LO (ABS and Diff Lock lights should come on), shut off the vehicle, pull the DIFF Lock fuse, shift the transfer case back to HI. The ABS and Diff Lock warning lights should remain lit in the instrument cluster (with the key ON) if the CDL is locked, then it's safe to drive with a driveshaft removed.

Thanks for the details. I didn't know all those extra steps were required to lock the center diff with the shaft out.

 

[Kernal]

That's assuming you haven't done the modification that allows you to just push a button.
And disengage the emergency brake of course before you drive the vehicle. The reason to pull the Emergency brakes first is because
with one driveshaft missing the vehicle can roll even with the transmission in Park if the CDL is not locked.

 

[COS80]

Oh, ok. I do have the CDL button and the pin 7 mod (or whatever you call it - I can lock the CDL in low and high).