Topic: New Front R&P very noisy on decelleration in gear

[Huhwhye]

Just has my gears installed and was testing it out and when off the gas the front end makes a lot of noise.  Under power it makes no noise and feels fine.  If I left off the gas and coast with the truck in gear it makes a loud whine.  Any suggestions?

This is on my 4runner that has ADD installed if that matters.  This is a new ring and pinion and has new bearings/parts and ARB installed.

[tech201]

sounds like the pinion depth isnt set right. the last one i had with a whine on decell was caused from the pinion being set too shallow.

[79coyotefrg]

sounds like bad setup to me

[Huhwhye [OP]]

That's what I was afraid of. This is my daily driver so getting this taken care of is not going to be easy.   

[Huhwhye [OP]]

Any chance its the driveshaft.  I seriously doubt it but my installer says that is the problem.  He says if I remove the front shaft it won't whine.  But that sounds like BS because it won't whine since there is no load on it RIGHT?


I'm going to try ZUK's suggestion and try an to pattern it throught the plug hole either tommorow or wednesday when I have the time.  But I need to get this done ASAP.  Taking a trip on the 7/4 and need functioning 4wd.

[ROCKO]

my rear diff. kind of makes a noise like that and i changed my drive line and it went away...

[Huhwhye [OP]]

Was that after new gears being setup?  Mine didn't make noise prior to the gear swap?  That's why I'm skeptical it can be the driveshaft. 

[Hyena]

Are the u-joints on the front shaft timed together?

[Huhwhye [OP]]

I can only assume so.  I bought the vehicle with 77k miles last december, so I don't really know but I assume the shaft has never been apart since it left the factory.

I do know it didin't make any noise before the gear/ARB install.

[79coyotefrg]

I can only assume so.  I bought the vehicle with 77k miles last december, so I don't really know but I assume the shaft has never been apart since it left the factory.

I do know it didin't make any noise before the gear/ARB install.

somebody had to remove the shaft  to install the gears,  check to make sure the shaft is still in "phase"

[ROCKO]

Was that after new gears being setup?  Mine didn't make noise prior to the gear swap?  That's why I'm skeptical it can be the driveshaft. 

yes it was after i put 5.29's in both diffs.

[Huhwhye [OP]]

somebody had to remove the shaft  to install the gears,  check to make sure the shaft is still in "phase"

Thank you for the diagram.  I verified that mine looks like the picture.

[79coyotefrg]

that leaves  the  gears being poorly setup 

[Huhwhye [OP]]

I actually removed the driveshaft since I dropped the diff off for the install.  But I was careful not to let the pieces separate.

Hopefully the installer will be a stand up guy and fix it.  I dropped the diff off to be worked on.  Frankly I don't feel like tearing this thing down again.  I should just take them the whole truck.