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Home/Factory & QC/Stage 7: Case Refinishing & Resealing Preparation

Transmission case entering the spray cabinet

Transmission housing in the spray booth during case refinishing

Real on-site footage from the Huadu factory floor

Process Walkthrough · Stage 7 of 10

Case Refinishing & Resealing Preparation

Stage 7 of the ten-stage TRANSMESUN remanufacturing process — the same procedure every unit follows at our Guangzhou Huadu factory, documented step by step.

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All ten stages

What happens in stage 7

Inside the stage.

Transmission housings are sandblasted to strip old sealant, rust and surface debris — down to clean metal, so nothing from the core's previous life survives into the rebuild.

All sealing surfaces are refinished and precisely prepped to guarantee perfect fitment and zero oil leakage after reassembly. A gasket can only seal as well as the surface under it.

Most oil leaks attributed to 'bad gaskets' are actually surface preparation failures. Refinishing the mating faces is what makes the new seals in stage 4 actually hold.

Acceptance criteria

What this stage verifies.

Applied to every unit on the line — the same standard shown in our on-site videos and verified by the 2026 Intertek on-site assessment (report 481351002_P+T).

Sandblasting to bare, clean metal Old sealant fully stripped from mating faces Rust and surface debris removed Sealing surfaces refinished to specification Fitment and sealing verified before assembly

Stage 7 FAQ

Questions buyers ask about this stage.

Why sandblast instead of just cleaning the housing?

Cleaning removes oil; sandblasting removes what cleaning cannot — old sealant, rust and surface debris — leaving sealing surfaces ready to be refinished properly.

Does the housing get checked after refinishing?

Yes. Sealing surfaces are refinished and prepped to specification before reassembly, so fitment and zero-leak sealing are verified at this stage.

Can I see this stage being done?

Yes. The Huadu workshop is open to customers for on-site factory tours, and the same walkthrough can be run live over a video conference if you cannot travel. Workshop, testing lab, showroom and warehouse are all on one campus.

See the full ten-stage process →

Order with confidence

Every unit follows all ten stages.

MOQ from 1 piece · lead time from 1 day for in-stock codes · 12-month quality guarantee · fitment confirmed in writing before dispatch. Send your transmission code or nameplate photo — engineer reply within 4 business hours.

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