drivetrain noise on decel without braking.

[Veikra]

I have a noise when I let off the throttle. its a grrgrrgrrgrr in time with the wheel rotation, feels like a wheel bearing. It shakes the truck like a disbalanced tire. But the harder I brake, the less prominent it is. Also completely disappear if the load on is minimal. doesnt happen on hard accel, only on decels

It's kind of a gear noise not meshing right. Im tempted to say rear diff but I dont know when the carrier bearing was done last, or ever. I have no play in front bearings and they turn smooth.

 

[Rancelot211]

Jack it up or put it on a lift to see if it's in the front or rear:thumb:

 

[Veikra]

Ok I tried , but it didnt do it. Maybe it needs load like the engine compressing from the weight of the truck. Ill think Ill open the rear end and check. Put a little marking yellow and check pattern?

 

[Veikra]

I think I found it ! Had a load in the bed and it started doing it on accel. So I stopped and found a slack U-joint on the differential .

That must be it ! I'll change it monday and post if it was the culprit.

 

[Awenta]

You can put load on the engine with the brakes. Use spicer non greasable u joints.

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[Veikra]

No couldnt, it was only doing it the opposite way. Using brake similated driving off with load, not decelerating or coasting.

I took what they had in store and it's greaseble. Im very gentle on that truck, do I have to worry about the greasable one I got ?

 

[Awenta]

You'll be fine

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[Veikra]

greasable joint is dead already, squeezing bad. Got spicer part number? not putting the same thing on this time

 

[N2BRK]

Should be a 1480 or 1410. Your local driveline shop should know which and have either in stock.