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2008 TrailblazerSS
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Hey Awdvette, what upgrades do you have on the front awd system to hold the 700hp?
upgrades to transfer case? Front diff?
Get a hardened intermediate shaft coupler, well greased and updated intermediate shaft carrier, there is the modification to add an extra threaded hole in the oil pan to give 4 bolts to the carrier instead of 3, cryogenic treated intermediate shaft or a hardened shaft if you can find someone to make one. There is a company that makes a few upgrades for the front diff, but this is more to assist with distributing the power more evenly to both front wheels. Not really sure if it makes it stronger.

There are no modifications known or that I have ever heard of for the transfer case.

The area that seems to fail is the intermediate shaft splines and the coupler splines that is inside of the carrier. No known CV axle failures. The only diff failures would more than likely be due to lack of maintenance.

I was able to buy a hardened coupler and had a new intermediate shaft cryogenically treated to increase it's durability and hardness. Then I just bought a new carrier that supposedly has been updated.

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Premium Member
2008 TrailblazerSS
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12,851 Posts
Chevy6000 where did you get the
hardened coupler?
intermediate shaft?
new carrier?


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For the carrier and shaft:
American Axle Manufacturing unit:
This is where I got the hardened coupler from: https://r.tapatalk.com/shareLink/topic?url=https://www.tbssowners.com/threads/awd-hardened-front-coupler-group-buy.240434/&share_tid=240434&share_fid=5834&share_type=t&link_source=app

I sent my intermediate shaft off to a company that does Cryo treatment to metal and they sent it back to me after they were done.

These guys offer cryo treated intermediate shafts and they are the ones that also offer the upgrades for the front diff. https://www.tbssowners.com/threads/bully-racing-lsd-front-diff.208937/
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