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drivetrain noises on deceleration RESOLVED


mk2davis
Junior Member
398/2000


Galant VR-4 org Post #: 1245669 posted 03/26/19 11:26 PM     Remind Me!  Send Private Message   Edit Post      
The motor in 398 is fantastic, I'm really happy with it right now. But I get terrible sounds on deceleration. From inside the car, it sounds like the sounds are coming from the front, but I wouldn't swear to it. Things are fine on acceleration, both leisure and aggressive. I have a slow grinding that doesn't go away with the ebrake on deceleration but does with the pedal. I also had a whorp whorp whorp that seems to be going away but still present with Redline Heavy Shockproof in the diff. And I get some contact with the exhaust on the carrier bearing, but this occasional. Clutch in doesn't seem to affect things at all. All these noises aren't present when the drive first starts, but drive for a few minutes, and it's undeniable.

I've taken the car to a few different shops, shop 1 said it was a bad bearing and diff, shop 2 said maybe the tranny? Shop 1 won't rebuild the diff because of age, which is no big loss because this shop hasn't exactly been stellar.

I've done some searching, and it sounds like some people are having success shimming the carrier bearing and installing a spacer (8mm is commonly called for) in between the driver jack shaft for the front wheels.

What is the best way to troubleshoot this? I realize that there are many causes for this, so I'm not looking for 1 answer solutions. I also realize that I may have a few different issues going on.

My plan so for is as follows:
Look at the driver's side axle with the wheel removed. Look and see if the angle from the axle to the jack shaft and see if a spacer seems appropriate. click
Stick a magnetic angle finder on the driveshaft and see how far off the different sections are. No one in the thread I read seemed to have a spec they were looking for, but a quarter an inch under the front carrier bearing seemed common. click
Lose the drive shaft all together. If the noise goes away, then it's likely the transfer case or the diff?
Stick Go Pros under the wheel wells of the front tires?

I have rebuilt the drive shaft about 1300 miles ago including the carrier bearing. I'd be surprised if they are bad, but it's certainly possible. Both front axles are new. I know front bearings are a b!tch to replace, so I'm hoping that's not it.

Suspects for this are (in this order): front bearings, driveshaft angle, jack shaft bearing or angle, diff, transfer case, drive shaft, tranny including center diff. Am I missing anything and how would you troubleshoot this? I am not willing to throw parts at this randomly and see what works.

Thanks for your help!


Edited by mk2davis (03/31/19 08:55 PM)

Posts: 78 | From: Ventura, CA | Member Since: 03/01/15 | IP: (47.148.36.232) | Report this post to a Moderator

thomcasey
I ain't no puny human
866/1000


Galant VR-4 org Post #: 1245671 posted 03/27/19 04:41 AM     Remind Me!  Send Private Message   Edit Post      
Jack-shaft bearing is easy to check. They are one of the most neglected parts of the drivetrain. I would start there.



Thom
866/1000 (PTE 1200's, billet 20g+, DSMLink v3, eagle/ross, .020 over, 272's, GC/AGX Coilovers)

Posts: 818 | From: Indianapolis, IN | Member Since: 09/24/14 | IP: (2601:803:c600:5b) | Report this post to a Moderator

strokin4dr
fighting them with a large needle
1280/2000
1135/2000


Galant VR-4 org Post #: 1245794 posted 04/11/19 06:06 AM     Remind Me!  Send Private Message   Edit Post      
What was the solution?



1908- sold and missed.
1280- 2.3, FP 35R, E85, etc.
1135- 100% stock
'93 Mirage hatch- 4g63, AWD, etc (hoarding for build)

Posts: 2764 | From: Savannah, GA | Member Since: 08/30/05 | IP: (2601:900:8201:50) | Report this post to a Moderator

mk2davis
Junior Member
398/2000


Galant VR-4 org Post #: 1245815 posted 04/13/19 12:50 PM     Remind Me!  Send Private Message   Edit Post      
I had one noise coming and one going. (Very, very) Old diff fluid was replaced first with Lucas, and then 300 miles later Redline Heavy Shockproof, and that sound has diminished greatly. One of the shops I took the car to in order to try and figure out what that sound was didn't torque down lug nuts on one of the wheels. So while the diff was getting quieter, the brake rotor was rubbing on the pads at parking lot speeds and on deceleration.

Posts: 78 | From: Ventura, CA | Member Since: 03/01/15 | IP: (47.148.36.232) | Report this post to a Moderator

transparentdsm
I have to say something dumb Member
138/2000


Galant VR-4 org Post #: 1245816 posted 04/13/19 01:03 PM     Remind Me!  Send Private Message   Edit Post   
Wow. Well fuck that shop.. glad you got things figured out though.



138/2000

Posts: 3519 | From: Klamath Falls, Or | Member Since: 07/27/11 | IP: (69.36.193.100) | Report this post to a Moderator


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