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Strange "Humming" Deceleration Noise and Resistance?

bucklahoo

NAXJA Forum User
Location
Ohio
2000 XJ. Stock. Original Tranny, axles, transfer case & rebuilt engine.

Weird noise started last week. Kind of like a humming or can be described like a winding or slight grinding type noise maybe.

after acceleration i take my foot off he gas and it starts. almost feel like its a resistance and its slowing the jeep down a little faster than normal. don't seem to hear it as much while accelerating.

shifting seems ok, checked tranny fluid, full but a little more brown than red.
haven't checked axles or transfer fluids.
everything else seems to be fine just came out the blue.

any thoughts at what it may be or what i could look at?
may have my mechanic give it a test drive this week.
 
Grease the slip yoke and try it before you go any further.
 
Typically a humming sound only heard during acceleration, or only during deceleration, is a worn u-joint.
 
referring to the u-joint on the driveshaft correct?
going into transfer case?

(not the axle u-joints correct? i've had those replaced recently)
 
There are 2 u-joints in the rear driveshaft and 3 u-joints in the front driveshaft.
 
Make sure pinion nut is torqued down.
 
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