Ring gear pitting
Thread Starter
Instructor
Joined: Feb 2013
Posts: 119
Likes: 1
From: Montreal QC
Ring gear pitting
Hey guys,
I'm about to buy a differential remotely (shipped from 600 miles away).
The seller is telling me that the donor car only has 25 000 miles.
The pictures are telling me otherwise. There is some kind of pitting, or darker area, in the center of the drive side gears.
Should I be concerned and investigate further before spending hundreds of dollars? Or if this is about right and it will drive just fine for many years to come?
Thanks for your precious input.
I'm about to buy a differential remotely (shipped from 600 miles away).
The seller is telling me that the donor car only has 25 000 miles.
The pictures are telling me otherwise. There is some kind of pitting, or darker area, in the center of the drive side gears.
Should I be concerned and investigate further before spending hundreds of dollars? Or if this is about right and it will drive just fine for many years to come?
Thanks for your precious input.
Thread Starter
Instructor
Joined: Feb 2013
Posts: 119
Likes: 1
From: Montreal QC
Race Director
Joined: Apr 2014
Posts: 15,064
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From: Washington Township Michigan
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the line you are referring too is caused by 1 of 2 concerns................... interference between the gears causing excessive load or a "case crush" condition where they were initially assembled with no clearance or lash between the gears to allow lube film on the gears to protect them. Just a FYI - I work for a Tier 1 driveline supplier of axles, and have seen literally thousands of them so I have some experience.
I would pass on this unless you were prepared to replace the components before installing it into the vehicle.
I would pass on this unless you were prepared to replace the components before installing it into the vehicle.
Race Director
Joined: Jul 2005
Posts: 12,021
Likes: 3,556
From: Central MO
the line you are referring too is caused by 1 of 2 concerns................... interference between the gears causing excessive load or a "case crush" condition where they were initially assembled with no clearance or lash between the gears to allow lube film on the gears to protect them. Just a FYI - I work for a Tier 1 driveline supplier of axles, and have seen literally thousands of them so I have some experience.
I would pass on this unless you were prepared to replace the components before installing it into the vehicle.
I would pass on this unless you were prepared to replace the components before installing it into the vehicle.
Pro
Joined: Sep 2011
Posts: 516
Likes: 59
In addition to the racing stuff, I also worked as Engineering Director for a Tier 1 drivetrain supplier to GM, Ford and Chrysler for 15 years.
So, OEM warranty analysis was one of our jobs as well.
I would pass on this one, unless you can get it real cheap and are planning to rebuild it with new parts, like others have said. Even then, it may be noisy.
If you need to know what "really good" looks like, just send me a PM, or I am sure other members here can help.
SG
So, OEM warranty analysis was one of our jobs as well.
I would pass on this one, unless you can get it real cheap and are planning to rebuild it with new parts, like others have said. Even then, it may be noisy.
If you need to know what "really good" looks like, just send me a PM, or I am sure other members here can help.
SG
Thread Starter
Instructor
Joined: Feb 2013
Posts: 119
Likes: 1
From: Montreal QC
Wow, thanks a lot guys. I didn't know that there was such a high level of drivetrain expertise here.
I'll follow the advices and keep looking. It's to replace my base, never raced, '08 differential that looks like this:
I'll follow the advices and keep looking. It's to replace my base, never raced, '08 differential that looks like this:
