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997 trans fit a 996?

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3 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis
THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCH997 trans fit a 996?

Leading reported evidence

Check clutch operation

Suggestion or failed attempt

No successful repair reported for this finding.

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Suggestion

My guess is that they are interchangeable, but definitely check the clutch operation.

997 trans fit a 996?
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Leading evidence: 'Check clutch operation' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Check clutch operation' (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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1 matching discussions · 3 captured posts examined · 0 partial discussions

Frequently discussed actions (1)

These are separate views of the same evidence. Frequency alone does not establish a fix, and these counts must not be added together.

Check clutch operation

No successful repair reported for this finding.

0
Reported fixes
0
Unsuccessful attempts
1
Discussions
Read evidence and context
Discussions that contain suggestions
1

0 original-poster resolution reports. Counts can overlap; they are not unique people or a success rate.

0 discussions have direct query context; 0 report a fix in that context. Other evidence may inherit the discussion’s subject.

Suggestion

My guess is that they are interchangeable, but definitely check the clutch operation.

997 trans fit a 996?
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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.

3 eligible posts · 0 unverified posts · 1 discussions match the subject in their title or opening post.

  • Rennlist: 1 discussions

0 evidence records excluded for query context · 0 excluded by outcome qualification · 0 adjusted by outcome qualification.

0 acknowledgements have no verified action link; they do not establish a repair result.

Generation: 20261026T213932Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi, Will a 997 6 speed transmission fit a 996 C2? If not has anyone developed a mod to make it fit? thanks, Eric

POST 2Original post

The '99 996 has a different trans mount than the later models. So you'll definitely need a new mount for the car. I assume the bolt pattern is the same for the engine/trans since the engine between the 996.2 and 997.1 is the same (basically). You will need to figure out if the starter is in the same place (probably is) and if the clutch operation is the same. My guess is that they are interchangeable, but definitely check the clutch operation.

POST 3Original post

Yes they're interchangeable. The shift linkage is on the other side (driver's side with the 997). Also the gearing is slightly lower.... 996 GEARING: 1st gear 3.818 2nd gear 2.20 3rd gear 1.516 4th gear 1.216 5th gear 1.024 6th gear 0.841 Final drive 3.444 997 GEARING: 1st gear 3.91 2nd gear 2.32 3rd gear 1.61 4th gear 1.28 (1.31 S model) 5th gear 1.08 6th gear 0.88 Final drive 3.44

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