new noise on 94 p/u

[cc1471]

I have a 94 ext. cab 4 cylinder 5-speed p/u with 165,000 miles. When I am on the highway 60 mph or above I hear a roaring noise from under the truck, but it is not a constant noise. The truck does not drive different when I hear the noise not do the rpm's change. As far as i can tell the clutch is good. Everything is stock except for a K & N air filter. Any one else every come across this before?

[HOGWILD]

Have ya checked the running gear fluids? sometimes the rear ends will growl before taking a dump!!!

[cc1471]

I had the truck in a shop last year and they checked the fluids in the transmission and the rear end and since then I have not spotted any leakage from either.

[HOGWILD]

I would check them myself and do not trust anyone to due quality maintenance because not too many maintainers that do quality work!

[cc1471]

I'm wondering if it could be the fan clutch. how would you test it?

[loytotoy]

So with your 5 speed the stick is on the floor; right? Check to see if the boot is loose and allowing air and noise into the cab.

[cc1471]

the shift boot is on. about two weeks ago the timing chain guide went out so i went and bought a timing chain kit and a new water pump from toyota and had it replaced. i had been reading about the guides wearing out and was kind of expecting it with the mileage i had on the truck. only thing now is i hear valves? clattering when i'm going up a bridge(might bring back to mechanic and check the timing). still runs good and gas mileage still 22 all around.

[sp04342]

check the rear wheel bearings. It is very easy to pull the axles out and a machine shop will charge about $30 to press new bearings for you.