ZF6 issue
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
My airplane mechanic found a ball pean hammer inside a wing, many years after production date. Some guys in NASA found a combination wrench inside one of the shuttles after it returned from space.
Hotshot
Joined: Mar 2014
Posts: 10,750
Likes: 1,065
From: Douglassville, PA
Not sure what that movie is..
put fluid back in and drove more. Shifted perfect, noise still there. Starting to think the transfer case is the issue. I am planning to put my np271 manual case in to verify if it solves the issue. I will then have another 271 case rebuilt by a local guy with all the updates mentioned in my other thread, “Other thread” and use that rebuilt case in my “good” truck. Also going to check the rear diff fluid while working on this.
put fluid back in and drove more. Shifted perfect, noise still there. Starting to think the transfer case is the issue. I am planning to put my np271 manual case in to verify if it solves the issue. I will then have another 271 case rebuilt by a local guy with all the updates mentioned in my other thread, “Other thread” and use that rebuilt case in my “good” truck. Also going to check the rear diff fluid while working on this.
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CNCFAB
Joined: Apr 2020
Posts: 4,874
Likes: 2,006
Welp. Did a new (used from parts truck) limited slip in plow truck rear end. Before pulling the zf6 again, I double checked u joints, this time with the shaft off.
Hope this is it. Frustrating, but learned to double check easy stuff before going to harder stuff lol
Hope this is it. Frustrating, but learned to double check easy stuff before going to harder stuff lol
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CNCFAB
Joined: Apr 2020
Posts: 4,874
Likes: 2,006
Always use spice sealed u joints. The shop that made this shaft used spicer grease-able which suck since they are regularly submerged in water. Lucky for me- aka- years of plow experience, I keep several 1410 lifetime sealed units on my shelf. Already replaced them. Will drive tomorrow and pray the noise is gone
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CNCFAB
Joined: Apr 2020
Posts: 4,874
Likes: 2,006
Test drive results- noise seems gone. Odd it sure sounded identical in sound and location to the failed throwout bearing last year. The bolt in the zf6 def threw me off, as did the metal flakes in the t case. Either way, I will take this easier and cheaper fix for this beat on plow truck. I will update if the noise returns upon more driving
Got Data?
Joined: Dec 2012
Posts: 4,267
Likes: 1,403
From: Lake Stevens, WA
Are rear driveline U-joints and resulting driveline balance easy to achieve? I've been hesitant to do driveline u-joints, especially on a CCLB, because of that risk, but would like to when necessary. The front axle u-joints were pretty straightforward.