W56 Noise Diagnosis

[jbramble24]

Hello again.

I am hoping you kind folks can help me figure out the noise my truck is making. It sounds like bearing noise/whirring/clatter similar to how my input shaft bearing sounded at idle before I replaced it. It is only heard while decelerating and moving. If I give it even a touch of throttle, the noise stops. When I press in the clutch while decelerating, the noise also stops.

The truck is a 93 4x4 22re with newly rebuilt motor, new clutch, flywheel, pilot bearing, throw out bearing, master and slave cylinders (all factory aisin / nachi parts). It has a w-56 forward shift trans with new input shaft bearing and countershaft bearing. Running redline mt-90 fluid in it and dino 75w90 in the transfer case. The trans internals looked ok to my untrained eye when I had it apart. No chipped teeth and reverse looked a little worn but all shifts fine.

Part of me says not to worry about it until something breaks but the obsessive part of me wants to know what it is.

Thanks!

[jbramble24]

I removed the rear driveshaft and took it for a spin and did not hear the noise. This leads me to believe I have a bad pinion bearing. Unless I can find a cheap used 3rd member, it looks like I'll be ordering a new one.

[OVRAROK]

do you know the gear ratio?  shouldn't be hard to find a 3rd

[jbramble24]

It's 4:11. I looked around on eBay but I'd rather have a new one for a couple hundred dollars more. I hate doing things twice but I usually end up doing so if I take a shortcut.

[:)bestgen4runner]

Local wrecking Yard. around $100 4.11 is By far the most common gear ratio. In a stock application this is not a part that fails often. Exceptions being abuse, neglect, or improper setup from the factory.
Nothing wrong with craigslist also.
Unless money is not a concern because then I say go buy a brand new factory one from your local Toyota dealer. $700 +

[Gnarly4X]

I removed the rear driveshaft and took it for a spin and did not hear the noise. This leads me to believe I have a bad pinion bearing. Unless I can find a cheap used 3rd member, it looks like I'll be ordering a new one.

jbramble24,

So you have eliminated the rear drive shaft as a potential cause of the "noise"??

Gnarls.

[jbramble24]

I replaced the u-joints and had the driveshaft checked and rebalanced (to 0.25 oz or less) by a driveline shop so it should be squared away.

Toyotas and jeeps are scarce in my local yards but I will look around. I'm starting to think this truck had way more than 190k on the clock! It was probably not well maintained either.

I'm not setting this truck up to crawl, but instead to be my daily driver so reliability is important. I drive ~80 miles round trip to work with occasional snow/ice. I have a Tacoma prerunner but it's rather squirrely in the snow with no weight on the back.

Thanks for the replies fellas! I'll do an intro thread and fill in the details on my latest money pit.