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THIS DISCUSSION / SOURCE-DERIVED OVERVIEW
Discussion summary
YOUR RESEARCHStripped bolts that hold aluminum cross bar under trans
Leading reported evidence
Run another 75k miles
Performed · outcome unconfirmed
No successful repair reported for this finding.
0
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0
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1
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Stripped bolts that hold aluminum cross bar under trans
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Leading evidence: 'Run another 75k miles' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace bolts' (1 discussions). For that action, 0 discussions report a resolution and 0 report an unsuccessful attempt. No action has an explicit, attributable resolution report under the current rules. These are forum reports and suggestions, not a confirmed diagnosis.
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Suggestion
I would re-tap the holes and replace the all bolts.
Stripped bolts that hold aluminum cross bar under trans
Use pre-encapsulated bolts, or
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Stripped bolts that hold aluminum cross bar under trans
Use threadlocker
Suggestion or failed attempt
No successful repair reported for this finding.
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Stripped bolts that hold aluminum cross bar under trans
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Counts describe captured discussions, not unique people or a diagnosis. Author identities are not reliably stored. Exact duplicate evidence is counted once across matching discussions; one discussion counts at most once per action/state. Multiple repairs reported together remain a combination. Suggestions and failed attempts do not establish a fix. Matches cover whole discussions and can include related faults, model variants and incomplete threads.
7 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.
Rennlist: 1 discussions
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Generation: 20261026T144035Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources
I started the removal of the transmission in my 2004 C4S today. One of the first things to remove after the under body trays are off the car is the aluminum cross bar under the trans. It's held on by 2 15mm bolts. They were very cranky coming out the whole way so I knew this was a problem. They are both messed up. Pics are attached. Has anyone else had this issue? Recommendations?
I would re-tap the holes and replace the all bolts.
Use pre-encapsulated bolts, or use threadlocker.
If they don�t feel like they will hold, drill and tap larger and mark the new sizes on the aluminum crossbar.
Anytime I modify a bolt hole from factory, I mark it for the next guy.
Sometimes the next guy is me years later.
Tapping them out is a good place to start. New bolts as well.
I had excellent results from putting JB Weld in stripped out threads on a Mercedes-Benz aluminum head. it was a $3K or $4K part and 6 weeks to get one. I smeared JB Weld in the threads and let it cure overnight while the head was on the engine. Came back the next day and tapped out the threads as described above. After numerous passes there was enough meat there to put in the ball pin mount. The car ran for another 75K miles.
Years later a mechanic took out the ball pin mount and was surprised at how bad the threads looked and put it back in.
The other choice, and most correct, is to put in a Hellicoil. You'll have real threads.
The good news is that this is not a super critical location. Could be in the engine block or something that needs a lot of torque.
"The other choice, and most correct, is to put in a Hellicoil. You'll have real threads."
^^^ This ^^^ is the proper choice, or if you want to be **** about it, take it to a machine shop, have them weld and re-tap the messed up holes. Also, when you put it back together, put some aluminum based anti-seize on those bolts - steel bolts in aluminum are always trouble (micro encapsulated or not) - don't put "thread locker" on them - it'll just make it worse...
