Pelican Parts

Things to do before installed USED C4 Tip gearbox?

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YOUR RESEARCHThings to do before installed USED C4 Tip gearbox?

Leading reported evidence

Replace diff seal

Suggestion or failed attempt

No successful repair reported for this finding.

0
Reported fixes: 0
Unsuccessful attempts: 1
Discussions

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Explicit resolution reports before identified causes, performed actions and suggestions. Within each level, matching component labels precede direct query mentions and inherited thread context; successful versus unsuccessful discussion counts, owner confirmations and independent discussion support determine order. This is not a probability of success.

Discussions that contain suggestions: 1

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Suggestion · Original poster
Should I replace the diff seal?
Original post Read captured discussion
Things to do before installed USED C4 Tip gearbox?

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Leading evidence: 'Replace diff seal' (no explicit attributable resolution; this is a reported action or suggestion). Across 1 matching discussions, The most frequently discussed action is 'Replace diff seal' (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 · 9 captured posts examined · 0 partial discussions

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Replace fluid now

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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Suggestion
Change the fluid now.
Original post Read captured discussion
Things to do before installed USED C4 Tip gearbox?

Replace transmission mount

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.

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

Suggestion · Original poster
- replace transmission mount
Original post Read captured discussion
Things to do before installed USED C4 Tip gearbox?

Frequently discussed actions (3)

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

Replace diff seal

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
Should I replace the diff seal?
Original post Read captured discussion
Things to do before installed USED C4 Tip gearbox?

Replace fluid now

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
Change the fluid now.
Original post Read captured discussion
Things to do before installed USED C4 Tip gearbox?

Replace transmission mount

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
- replace transmission mount
Original post Read captured discussion
Things to do before installed USED C4 Tip 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.

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

Pelican Parts: 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: 20261026T112012Z · outcome-qualification-6. Deterministic extraction; no AI model inference. How we use sources

POST 1 / ORIGINAL POSTEROriginal post

I picked up a used early C4 Tip gearbox and want to make sure its ready to go before installing in into my 996. Here is what I plan to do: - replace transmission mount - new filter/seal and fluid (after its installed) Should I replace the diff seal? Are there any other areas I should look at before reinstalling it? Any tips on the R&R would be helpful from those who have done one before. JFP in PA has been an amazing resource thus far, thank you man!! Brian

POST 2Original post

RMS, IMS, AOS at a minimum.

POST 3 / ORIGINAL POSTEROriginal post

JFP, RMS and AOS were done when the IMS was done about a year ago glad that is done! lol Anything else good sir? Brian

POST 4Original post

Quotes source post: 9889962

That's all I have. good luck!

POST 5Original post

Change the fluid now. It is a lot easier filling it from the top.

POST 6Original post

Quotes source post: 9889962

Something came to mind: With the new trans out of the car, this is your only time that you can drain both the trans AND the converter of old fluid. By doing this now, you would start with all fresh fluid.

POST 7 / ORIGINAL POSTEROriginal post

JFP, what is the best way to do this? Brian

POST 8Original post

You will need to remove the converter and turn it snout down into a large bucket, and then leave it there overnight to let the fluid drain out. Then reinstall the converter and put the assembly in the car. With the trans out, it is the only time you can fully drain the converter, which holds the lion's share of the old fluid.

POST 9 / ORIGINAL POSTEROriginal post

Then prefill it via the top per yelcab1's suggestion, if I recall that's 9 liters of ATF? Brian

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