The 1968 Citroen D21 has 13 automatic transmission parts with verified fitment on this page — 4 part types and 2 brands, covering the 2.2L L4 engine. Each part includes a manufacturer part number and application notes.
The automatic transmission on the 1968 Citroen D21 covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts. The largest groups are Extension Housing Seal (5 parts), Filter (4 parts) and Extension Housing Bushing (2 parts). The other 1 part type covers the remaining 2 parts.
Every part on this page is matched to the 2.2L L4 — the only engine offered in the 1968 Citroen D21.
The most listed brands for 1968 Citroen D21 automatic transmission parts are ATP (8 parts) and PIONEER (5 parts).
1 part on this 1968 Citroen D21 page carries a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — PIONEER 759016 (Extension Housing Seal). Click any part number to see every vehicle that part fits.
Extension Housing Bushing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP | FB12 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| PIONEER | 755176 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Extension Housing bushings. Typical signs include a clunk over bumps, or a torn or walked-out bushing you can see. Press the new bushing square. A cocked bushing will tear in a few thousand miles.
2 Extension Housing Bushing parts for the 1968 Citroen D21 come from 2 brands — ATP and PIONEER.
This group includes ATP FB12 and PIONEER 755176.
Extension Housing Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PIONEER Popular | 759016 | 🇺🇸 US 🇨🇦 CA | without Bootwith Flange | View on Amazon |
| ATP | RO4 | 🇺🇸 US 🇨🇦 CA | Trans. code BW351-61/64" O.D. | View on Amazon |
| ATP | HO9 | 🇺🇸 US 🇨🇦 CA | without Bootwith Flange | View on Amazon |
| ATP | KO3 | 🇺🇸 US 🇨🇦 CA | Outer Diameter: 2.25" | View on Amazon |
| PIONEER | 759045 | 🇺🇸 US 🇨🇦 CA | Outer Diameter: 2.25" | View on Amazon |
This table covers the seals at the Extension Housing. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
5 Extension Housing Seal parts are listed for the 1968 Citroen D21, from ATP and PIONEER. PIONEER 759016 carries the "Popular" badge.
This group includes PIONEER 759016, ATP RO4 and ATP HO9 and the remaining parts above.
Filter
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP | JX150 | 🇺🇸 US 🇨🇦 CA | In-Line Filter KitIncludes: (2) Hoses, (4) Clamps | View on Amazon |
| ATP | JX151 | 🇺🇸 US 🇨🇦 CA | In-Line Filter KitInline Cooler Filter | View on Amazon |
| ATP | IL150 | 🇺🇸 US 🇨🇦 CA | In-Line Filter KitInline Cooler Filter | View on Amazon |
| PIONEER | 745119 | 🇺🇸 US 🇨🇦 CA | Inline Cooler FilterIn-Line Filter Kit | View on Amazon |
This table covers the replacement filters for this application — the table heading and notes say which circuit. Typical signs include restricted flow — long cranking, weak airflow, or dirty fluid after a short interval. Seat the new filter so it cannot bypass, and use the grade the notes call for.
4 Filter parts for the 1968 Citroen D21 come from 2 brands — ATP and PIONEER.
This group includes ATP JX150, ATP JX151 and ATP IL150 and the remaining parts above.
Fluid Pump Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ATP | RO1 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| PIONEER | 759043 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the seals at the Fluid Pump. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
2 Fluid Pump Seal parts are listed for the 1968 Citroen D21, from ATP and PIONEER.
Listed part numbers: ATP RO1 and PIONEER 759043.
Buying Automatic Transmission Parts for a 1968 Citroen D21
On this vehicle, the automatic transmission covers the automatic gearbox and its supporting cast — filters, coolers, solenoids, mounts and torque-converter parts.
- Confirm you have the 2.2L L4 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Extension Housing Seal and Filter .
Frequently Asked Questions
How many automatic transmission parts fit the 1968 Citroen D21?
Our catalog currently lists 13 automatic transmission parts for the 1968 Citroen D21 across 4 subcategories and 2 brands, covering the 2.2L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of automatic transmission problems on a 1968 Citroen D21?
Common symptoms include delayed or harsh engagement, slipping under load, fluid that smells burnt, or shuddering at light throttle around 40 mph. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the filter and pan gasket with every fluid service, and flush the cooler lines when replacing a failed unit.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1968 Citroen D21 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1968 Citroen D21?
Every part on this page is matched to the 2.2L L4 engine. Then use exactly the fluid specification in the notes — automatic transmissions are the least forgiving component on the vehicle about fluid choice. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1968 Citroen D21
Automatic Transmission Parts for Other Citroen D21 Years
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