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Old 01-04-2021, 08:24 PM   #1
j-scott
Scooby Newbie
 
Member#: 213328
Join Date: Jun 2009
Location: Northern Va
Vehicle:
2019 WRX Premium
Crystal Pearl White

Default Replace rear axle?

I installed a MAP catback exhaust about a year ago on my 2019 WRX premium and in that time I've decided that it droned too much for my liking inside the car and decided to reinstall the stock exhaust.

As I was removing the MAP catback I noticed a lot of grease around the driver's side rear axel. It turns out the metal clip surrounding the axle boot on the side closest to the differential was contacting the midpipe and had broken off. There was grease splashed all around the area and a pretty decent wear mark was noticeable on the midpipe. I have no idea how long ago the clip broke off or how long the axle boot has been without grease.

The car drives fine and I hear no noticeable noises back there. When I inspected the inside of the boot I didn't see any thing that appeared to be broken, like metal shavings or anything. Would I be okay to just refill the boot with grease and install a new clamp or should the axle be replaced? Could this have done any damage to the rear differential? I'm tempted to take it to a nearby Subaru dealership but don't want to pay out the ass since I caused the issue.

Thanks
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Old 01-04-2021, 08:31 PM   #2
Gucciflipflops
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Member#: 521349
Join Date: Dec 2020
Chapter/Region: South East
Vehicle:
2005 Impreza WRX

Default

Usually when you have no grease for an unknown amount of time like that itís best to replace the axle. If I were in your situation and I had the money I would replace the axle. If times are tough go ahead and replace the boot/grease but you will be rolling the dice with your very new car.
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Old 01-04-2021, 09:55 PM   #3
j-scott
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Member#: 213328
Join Date: Jun 2009
Location: Northern Va
Vehicle:
2019 WRX Premium
Crystal Pearl White

Default

Thanks for the reply. Money isn't tight but I'd rather not spend money unnecessarily. I think I'll try and refill the boot with grease and seal it back up. Just need to find the parts to buy for the clamp, the grease, and the tool to secure the clamp.
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Old 01-05-2021, 09:22 AM   #4
Gucciflipflops
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Member#: 521349
Join Date: Dec 2020
Chapter/Region: South East
Vehicle:
2005 Impreza WRX

Default

Quote:
Originally Posted by j-scott View Post
Thanks for the reply. Money isn't tight but I'd rather not spend money unnecessarily. I think I'll try and refill the boot with grease and seal it back up. Just need to find the parts to buy for the clamp, the grease, and the tool to secure the clamp.
I highly suggest the knipex ear clamp pliers. I used a NAPA kit when I did my 05 wrx.
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Old 01-05-2021, 04:45 PM   #5
killadawg
Scooby Specialist
 
Member#: 424203
Join Date: Jun 2015
Chapter/Region: NWIC
Location: Mountains WA
Vehicle:
2016 WRX STage ??
STI/PPG/ GM

Default

I lost 2 R180 diff's due to my exhaust (midpipe) rubbing and over heating my rear diff. I was totally unaware of it, and like yours, it did not make any noise, unitil the day it basically exploded internally (probably due to prolonged overheating cycles etc..) mine did not have any leaks but I basically cooked the diff oil over several thousands of miles.. I track and hill climb the car, so it was definitely stressed. I had a shop swap my rear diff out with a Cusco.. well that one failed not too shortly there after, not even 3k miles.. I then crawled up under my car and realized that the Nameless midpipe literally is pressed up against the rear diff casing. I did some short drives and tested with at laser thermometer a variance of 25 degrees from front diff and trans compared to the rear diff.

I ended buying a titanium R400 that gives the diff a good inch of breathing space and had it ceramic coated (it also doesn't interfere with the axles nor boots).. no more overheating problems (temps only 5 or so degrees off) and my OS Giken diff has held up for a good 6k so far! (diff oil has always been Cusco or Motul if anyone cares to know.. )

get a new clip etc.. re-grease the boot.. etc.. better to be safe than sorry (also check your diff, just in-case.
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