Offroad Trailblazers and Envoys

How bad is surface cracking within front axle disconnect?

G80, GU6, GT4, GT5, WTF? This section is for gearing and driveline stuff.

by mjs454 » Sun Jan 06, 2019 10:00 pm

I'm in the process of a front axle disconnect rebuild, per the sticky on this site (thanks!). One thing it doesn't mention is any apparent cracking on the inside surfaces of the housing (both sides in my case; see picture).
20190106_front axle disconnect casing.jpg
Front axle disconnect housing. Cracking?

How bad is this? Could it be a manufacturing feature, or stress induced where I should replace? The unit has ~180,000 mi on it.

I did find some posts about these casings failing... Definitely not a desired outcome. But replacing the housing + bearings + seals + one of the gears is very costly... Any recommendations for/against the ebay units?

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Name: Michael
Vehicle Year: 2003
Vehicle: GMC Envoy XL
DriveTrain: 4WD w/ Aftermarket Locker

by Anthony Hernandez » Wed Jan 09, 2019 6:46 pm

The inside of my discos have always been like that man. I think it’s just the irregularities in the cast.. they aren’t cracks... it’s superficial..
Marks3"-moog 14's-fox shocks-z71's-4.56 gears-rear locker-
My build - viewtopic.php?f=74&t=6225
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Anthony Hernandez
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Location: Salem, VA
Name: Anthony
Vehicle Year: 2007
Vehicle: Chevrolet TrailBlazer
DriveTrain: 4WD w/ Aftermarket Locker

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