Defective clutch equals noisy ZF5

markfuga · Jul 12, 2014

I know there's a lot of complaints about the single mass flywheels causing the ZF5 to be noisy rattle boxes but the issue could also be a defective clutch.

I put a new Valiar clutch in my truck (NMU70263-01) and resurfaced the Luk flywheel that I already had. I immediately noticed a low growl/rattle when the clutch is engeaged in nuetral. I expected this becasue of all the online reading I had done. Within 50 miles of driving the noise about doubled and was rather unbearable to listen to. I also noticed a slight "stutter" when engaging the clutch in 1st from a stop and a small "stutter" when shifting.

I pulled the clutch out for inspection and found its only grabbing on one side (this explains the stutter). I know its only grabbing on one side becasue the hot spots on the flyweel match the hot spots on the pressure plate. I wasn't optimistic that it could also be the source of the noise.

I bought a new Luk 07-171 clutch and now the transmission is SILENT! Absolutely no noise with the clutch depressed or engaged. The stutter is gone and the truck is a joy to drive again.

markfuga · Jul 13, 2014

Here's a video I made before I knew what the problem was. Throwing this out there in case someone else has a similiar sounding transmission and they're believing it's just gear rollover noise in the transmission.

https://www.youtube.com/watch?v=9sfAlGXr6hQ

mandkole · Jul 13, 2014

the luk will be just fine.. I liked mine and it holds the little extra power just fine. I'd just keep the power away from it until it seats in real good.

Magnum PD · Jul 13, 2014

I want pics of the truck and under the hood!

markfuga · Jul 13, 2014

Here's a couple slightly older pics of the truck and the link to the engine swap. I have a couple videos on youtube that are linked in the engine swap thread. I think the second to last video in the thread is all about the "fit under the hood".

http://powerstrokearmy.com/forums/showthread.php?t=38159