help with bad grinding noise

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Apr 20, 2002
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I have a 75 FJ40, 350 conversion, turbo 400, 4 inch lift ect. When I decelerate in 4 wheel drive I have a very bad grinding-vibration, in the front but I cant find the problem. I have checked the Ujoints and there is no metal in the front diff. Transfer case maybe? please help, thanks.
 

woody

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You drive around in 4wd? Like, on the road?

Front input bearing on the t-case - pinion bearings - u-joints - first three I'd check.

IMO, if your not either A> stuck or B> somewhere you might get stuck, your hubs should not be locked in. VERY hard on the front driveline, and adds a lot of unnecessary wear.
 
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I live in Montana and there is a foot of snow outside my door that is why I am driving with it in 4x4, thanks for the input.. I will check my bearings. Everything feels smooth when I spin things by hand however.
 

woody

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then you fall in the B> category...lol

Does it happen in 2wd with the hubs unlocked?

Does it happen with the hubs locked but the t-case in 2wd?

Does it happen with the hubs unlocked and the t-case in 4wd?
 
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I can only get it to happen with hubs and T-case locked, runs smooth if one or the other isnt locked in, so there has to be some resistance in order for the (noise/vibration) to start up. The driveline and U-joints are perfect-no slop anywhere. Thanks for the input
 

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