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Discussion Starter · #1 ·
I have a 2011 Cadillac CTS-V coupe 6 speed manual and while getting my driveshaft re balanced the shop noticed a crack in my subframe drivers side. So I try to order a new subframe or find an aftermarket subframe can't find one so I head over to ebay find a "good used one" but it is cracked as will as anyone had an issue with there subframe? Last two pictures are of the one I got from eBay
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Wow.

Well since you’ve already purchased a replacement and have the part out of the car. Maybe try contacting a local machine shop and see what their suggestion is for reinforcement or strengthening that weak area?
 

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Discussion Starter · #3 ·
Yeah I sent it to a fabricator he can repair the cracked portion hopefully he can find a way to strengthen it I found a company that makes one for our cars but it doesn't have a position for the ABS module and you have to lose your sway bar which I don't want to do
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It's still available from my GM source in Canada... which I can tell you gets ordered from the USA.

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Discussion Starter · #5 ·
It's still available from my GM source in Canada... which I can tell you gets ordered from the USA.

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Yeah I checked with my gm parts representative here in the USA and said there is no eta when it will be available also I don't want the new one to crack as well I wonder if any one else has had the same problem
 

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If a fab shop is gonna fix it for you, make sure they do the same to both sides.
 

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Geez now I gotta check mine.
 
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Just know the weld can often times be weaker due to the base metals faster heat dispersion than steel. Now I'm not sure what the series/grade of the base metal is but that can have an effect on the strength of the weld based on what type of filler is used.
 

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Discussion Starter · #10 ·
Geez now I gotta check mine.
That's one of the main reasons why I posted this for us to check our cars I don't know how many years of mine has been cracked for and also to find out if it has happened to the people
Just know the weld can often times be weaker due to the base metals faster heat dispersion than steel. Now I'm not sure what the series/grade of the base metal is but that can have an effect on the strength of the weld based on what type of filler is used.
Yeah but that section is not welded it is a machined
 

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Mine was cracked when I started installing the CS bushings. Paid about the price OP listed from GM. Found a good used one for $1k but was willing to pay slightly more for a critical piece. This area does seem a little thin considering all the stress it is under…


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Yup, mine's cracked too. Looks like I'm pulling a sub frame and doing some welding today unexpectedly.

I cannot believe these highly loaded structural areas are machined sooo super thin, like 2-3 mm is shaved away leaving only about 3 mm remaining.
 

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Yup, mine's cracked too. Looks like I'm pulling a sub frame and doing some welding today unexpectedly.

I cannot believe these highly loaded structural areas are machined sooo super thin, like 2-3 mm is shaved away leaving only about 3 mm remaining.
Boo. Hiss. Sorry to hear this.

Please let us know how the welding goes. You know. "Just in case."
 

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Well I'm sure you've been through this. How'd it work out for you?
 

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Well I'm sure you've been through this. How'd it work out for you?
Nope, no experience (yet). I'll be checking on it though.

I'm hoping the steel inserts from the poly mounts keep the tangs from collapsing too much.

If it happens, I'll have to pull everything and find a local welder I guess.

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Well, no cracks. Lucky me!

I'm surprised given I have 95,000 miles - mostly lowered and on wider wheels - compared to stock.

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Boo. Hiss. Sorry to hear this.

Please let us know how the welding goes. You know. "Just in case."
Would this, possibly be. . . Your last mod..lol
 

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I have a 2011 Cadillac CTS-V coupe 6 speed manual and while getting my driveshaft re balanced the shop noticed a crack in my subframe drivers side. So I try to order a new subframe or find an aftermarket subframe can't find one so I head over to ebay find a "good used one" but it is cracked as will as anyone had an issue with there subframe? Last two pictures are of the one I got from eBay
Was this causing any suspension noises/clunks for you? I need to check mine...
 

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2011 CTSV Coupe M BLK LSX376-B15
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I have a 2011 Cadillac CTS-V coupe 6 speed manual and while getting my driveshaft re balanced the shop noticed a crack in my subframe drivers side. So I try to order a new subframe or find an aftermarket subframe can't find one so I head over to ebay find a "good used one" but it is cracked as will as anyone had an issue with there subframe? Last two pictures are of the one I got from eBay View attachment 157841
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Thanks for the heads-up, I'll make sure to check mine next time on the lift. Wonder if it was bad alloy or process failure in manufacturing that may have caused the issue, design maybe?
 
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