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I've researched and read quite a few posts on the "driveline clunk" topic. It could be anything from driveshaft, to pinion angle, to u-bolt torque.
What I'm curious about, is to know if anyone thinks it could be related to some rust on the slip yoke itself. I do have a small lift block on the rear, which had no problems for two years. This winter I developed the drive line clunk. I bought the Ford PTFE lubricant and lubed everything up, and it appeared to fix the issue for a week, but the clunk returned. When I had everything apart, I noticed there was a small amount of gear oil inside the area where the slip yoke connects to the t-case, and I noticed the exterior of the slip yoke had some surface rust which appears to have horizontal striations in the rust.
My hope is that removing the rust and re-lubricating everything will get rid of the clunk, which is only present when taking off from a stop.
Does anyone have any experience with this particular surface rust on the slip yoke?
Surface rust on the outside of the slip yoke won't cause driveline lash. Looks like you're leveled and I see Bilsteins on back, is the rear lifted at all? That can affect how far the slip yoke goes into the TC, which might affect how much of the yoke gets exposed to the elements and potential rusting.
I have a similar amount of lash/clunk that is evident when slowing down and then speeding up on the highway. I'm worried that it's due to slip yoke/TC shaft spline wear developing some play, but I don't know for sure.
Surface rust on the outside of the slip yoke won't cause driveline lash. Looks like you're leveled and I see Bilsteins on back, is the rear lifted at all? That can affect how far the slip yoke goes into the TC, which might affect how much of the yoke gets exposed to the elements and potential rusting.
I have a one inch over stock lift block in the rear, as well as the Bilsteins.
Mine had a similar amount of rust when I fixed my clunk. I just sanded it off and covered the whole thing in Neolube. That stuff is indestructible, and its kept the rust at bay for years now.
Relubing with PTFE doesn't solve the clunk for a lot of people. I've used Neolube instead for my truck, and about a dozen others with much better luck. See my original post for more info: https://www.f150forum.com/f38/anothe...ke-fix-382555/
There's a nice pic of my rust in there as well, pre and post sanding, as well as after Neolube application.
Last edited by antony1103; Apr 25, 2023 at 10:16 AM.
Looking on input for driveline "clunk"
