I am having trouble locating a whining noise coming from the front end. About 1 month ago while in Montana, I noticed my 1994 Land Cruiser (164kmiles) began having a whining noise when I first started rolling and it peaked in volume at about 20mph. It would go away after about 3-5 min and not return again until things were cold. It sounds like a high pitched gear or bearing whine. It does not seem to be correlated to transmission as I can have it in neutral and coast down a hill and the noise is unchanged whether I'm in drive or neutral. It's unchanged changed with Engine RPM's. The truck moving is what causes the sound.
I recently changed out the front/rear Diff and transfer case with 80w90 with Lucas oil stabilizer 4 months before.
I checked all differential and transfer case oil levels and they are good. Transmission was just serviced 2 years (20kmiles) ago by the local land cruiser shop and it was all good. Fluid in transmission is clean still.
Does anyone have any thoughts? Is it worth draining the transfer case and putting a Valvoline 75w90 in it? I haven't rebuilt the front axle or knuckles yet either so maybe it could be something in there.
I recently changed out the front/rear Diff and transfer case with 80w90 with Lucas oil stabilizer 4 months before.
I checked all differential and transfer case oil levels and they are good. Transmission was just serviced 2 years (20kmiles) ago by the local land cruiser shop and it was all good. Fluid in transmission is clean still.
Does anyone have any thoughts? Is it worth draining the transfer case and putting a Valvoline 75w90 in it? I haven't rebuilt the front axle or knuckles yet either so maybe it could be something in there.