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C2 vs C4 gearbox

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5 captured repliesDiscussion pagination complete · Source accounts, not a confirmed diagnosis

THIS DISCUSSION / SOURCE-DERIVED OVERVIEW

Discussion summary

YOUR RESEARCHC2 vs C4 gearbox

Leading reported evidence

Use but does anyone know of anyone

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

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

Suggestion · Original poster
I know I'll be sacrificing my LSD, and I know the output shaft going to the front of the gearbox will just spin away in use but does anyone know of anyone that has done the above?
Original post Read captured discussion
C2 vs C4 gearbox

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Leading evidence: 'Use but does anyone know of anyone' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Use but does anyone know of anyone' (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 · 5 captured posts examined · 0 partial discussions

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Use same trans

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Discussions that contain suggestions: 1

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

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Suggestion
They are using the same trans.
Original post Read captured discussion
C2 vs C4 gearbox

Frequently discussed actions (2)

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Use but does anyone know of anyone

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 · Original poster
I know I'll be sacrificing my LSD, and I know the output shaft going to the front of the gearbox will just spin away in use but does anyone know of anyone that has done the above?
Original post Read captured discussion
C2 vs C4 gearbox

Use same trans

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
They are using the same trans.
Original post Read captured discussion
C2 vs C4 gearbox

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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.

5 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.

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Generation: 20261027T140027Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

Hi all, I have a '99 C2 and the 2nd gear syncro has failed, the is still driveable but I have to double clutch going down the gears. A rebuild isn't really an option as I can't have the car off the road for that long so I'll be putting a used gearbox in it. My question is would a C4 gearbox be useable in my C2? I know I'll be sacrificing my LSD, and I know the output shaft going to the front of the gearbox will just spin away in use but does anyone know of anyone that has done the above? It's a slim chance I know but the 4WD gearbox is much cheaper and more plentiful around me. Many thanks, Liam.

POST 2Original post

My guess is that you will be fine. There are plenty of people converting their C4 and C4S to be rear wheel drive only. They are using the same trans. So you should be fine.

POST 3Original post

it's the same transaxle used in C2 and C4...

POST 4Original post

Doesn't the C4 have a different tunnel? I think the C4 shell is stiffer. Not sure if the area where the transmission is located is any different.

POST 5Original post

You'll be fine, you just have a spare output shaft off the nosecone, spinning freely not driving anything.

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