This page lists 27 drivetrain parts for the 1978 Excalibur Phaeton, across 7 part types, covering the 7.4L 454cid V8 engine. Every part shows its brand, manufacturer part number and fitment notes.
On the 1978 Excalibur Phaeton, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware. 20 parts of the 27 listed are Differential Pinion Bearing / Race (14 parts), Differential Carrier Bearing / Race (3 parts) and Differential Pinion Seal (3 parts). The other 4 part types cover the remaining 7 parts.
Every part on this page is matched to the 7.4L 454cid V8 — the only engine offered in the 1978 Excalibur Phaeton.
The most listed brands for 1978 Excalibur Phaeton drivetrain parts are WJB / INMOTION PARTS (8 parts), BCA (8 parts) and FAMOUS BRAND (3 parts), plus 6 more brands. Quality grades include Economy and Standard Replacement.
3 parts on this 1978 Excalibur Phaeton page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including WJB / INMOTION PARTS WTM88048 (Differential Pinion Bearing / Race) and WJB / INMOTION PARTS WTM802048 (Differential Pinion Bearing / Race). Click any part number to see every vehicle that part fits.
Axle Shaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SCHAEFFLER | SS2395 | 🇺🇸 US | Rear1.37" I:D X 2" O.D. X 0.31" Width | View on Amazon |
This table covers the seals where an axle shaft exits the 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.
This group shows a single part: SCHAEFFLER SS2395.
Differential Carrier Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | WTA36 | 🇺🇸 US | Rearwith 8.75 IN Ring Gear | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | A36 | 🇺🇸 US 🇨🇦 CA | GoldSet | View on Amazon |
| BCA | NBA36 | 🇺🇸 US | Taper Bearing SetIncludes Cup and Cone | View on Amazon |
This table covers the bearings and races that support the differential carrier.
3 Differential Carrier Bearing / Race parts for the 1978 Excalibur Phaeton come from 3 brands — WJB / INMOTION PARTS, ACDELCO and BCA.
The Economy section lists 1 option from WJB / INMOTION PARTS — the catalog's value-priced group. WJB / INMOTION PARTS WTA36 is listed in this group.
In the Standard Replacement grade, ACDELCO and BCA supply 2 parts: built to original-equipment specification. A representative part number is ACDELCO A36.
This group includes WJB / INMOTION PARTS WTA36, ACDELCO A36 and BCA NBA36.
Differential Cover Gasket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO | RDS133141 | 🇺🇸 US | Rearwith GMC Axle(s) | View on Amazon |
| VICTOR REINZ | 711486000 | 🇺🇸 US | Fits Rearwith 12 Bolt Holes | View on Amazon |
This table covers the gaskets that seal the Differential Cover. Typical signs include seepage at the joint, a burnt-oil smell, or a leak that appears only after a long drive. Clean both flanges and torque in the sequence the notes or the manual call for.
2 Differential Cover Gasket parts for the 1978 Excalibur Phaeton come from 2 brands — FEL-PRO and VICTOR REINZ.
This group includes FEL-PRO RDS133141 and VICTOR REINZ 711486000.
Differential Pinion Bearing / Race
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS Popular | WTM88048 | 🇺🇸 US | Bearing Shape: Cylindrical | View on Amazon |
| WJB / INMOTION PARTS Popular | WTM802048 | 🇺🇸 US | Bearing Shape: Cylindrical | View on Amazon |
| FAMOUS BRAND | SM802011 | 🇺🇸 US 🇨🇦 CA | RearInner | View on Amazon |
| FAMOUS BRAND | SM88010 | 🇺🇸 US 🇨🇦 CA | RearOuter | View on Amazon |
| FAMOUS BRAND | SM802048 | 🇺🇸 US 🇨🇦 CA | RearInner | View on Amazon |
| ULTRA-POWER | WTM88048 | 🇺🇸 US 🇨🇦 CA | RearOUTER | View on Amazon |
| ULTRA-POWER | WTM802048 | 🇺🇸 US 🇨🇦 CA | RearINNER | View on Amazon |
| WJB / INMOTION PARTS | WTM802011 | 🇺🇸 US | Race | View on Amazon |
| WJB / INMOTION PARTS | WTM88010 | 🇺🇸 US | RaceCup Outside Diameter (In): 2.6880000000000002 In | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Popular | NBM802048 | 🇺🇸 US | Bearing Shape: Cylindrical | View on Amazon |
| BCA | NBM88010 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBM802011 | 🇺🇸 US | Race | View on Amazon |
| BCA | NBM88048 | 🇺🇸 US | Bearing Shape: Cylindrical | View on Amazon |
| BCA | NBBR52 | 🇺🇸 US | Bearing & Race | View on Amazon |
This table covers the bearings and races on the differential pinion.
14 Differential Pinion Bearing / Race parts are listed for the 1978 Excalibur Phaeton, from BCA, WJB / INMOTION PARTS, FAMOUS BRAND and 1 other brand. WJB / INMOTION PARTS WTM88048 carries the "Popular" badge.
Economy: 9 parts, from WJB / INMOTION PARTS, FAMOUS BRAND and ULTRA-POWER. A representative part number is WJB / INMOTION PARTS WTM88048.
The Standard Replacement section: 5 options from BCA. BCA NBM802048 is listed in this group.
Differential Pinion Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WJB / INMOTION PARTS | WS99193 | 🇺🇸 US | Rear Outerwith 8.75 IN Ring Gear | View on Amazon |
This table covers the wear sleeves used to restore a grooved pinion seal surface.
This group shows a single part: WJB / INMOTION PARTS WS99193.
Differential Pinion Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA | NS2043 | 🇺🇸 US | Rearwith GMC Axle(s) | View on Amazon |
| SCHAEFFLER | SS2983 | 🇺🇸 US | Rearwith 1.938 In Shaft | View on Amazon |
| WJB / INMOTION PARTS | WS2043 | 🇺🇸 US | Rear Outerwith 8.75 IN Ring Gear | View on Amazon |
This table covers the seals at the differential pinion yoke. 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.
3 Differential Pinion Seal parts for the 1978 Excalibur Phaeton come from 3 brands — BCA, SCHAEFFLER and WJB / INMOTION PARTS.
Listed part numbers: BCA NS2043, SCHAEFFLER SS2983 and WJB / INMOTION PARTS WS2043.
Differential Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA | NS472258 | 🇺🇸 US | Rearwith GMC Axle(s) | View on Amazon |
| NATIONAL | 472258 | 🇺🇸 US | Rearwith 8.75 IN Ring Gear | View on Amazon |
| WJB / INMOTION PARTS | WS472258 | 🇺🇸 US | Rearwith 8.75 IN Ring Gear | View on Amazon |
This table covers the seals at the Differential. 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.
3 Differential Seal parts are listed for the 1978 Excalibur Phaeton, from BCA, NATIONAL and WJB / INMOTION PARTS.
Part numbers include BCA NS472258, NATIONAL 472258 and WJB / INMOTION PARTS WS472258.
Buying Drivetrain Parts for a 1978 Excalibur Phaeton
On this vehicle, the drivetrain system moves power from transmission to wheels through axles, CV joints, driveshafts, differentials and wheel-end hardware.
- Confirm you have the 7.4L 454cid V8 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 differential or transfer-case fluid with any axle or seal job while everything is already open.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Differential Pinion Bearing / Race and Differential Carrier Bearing / Race .
Frequently Asked Questions
How many drivetrain parts fit the 1978 Excalibur Phaeton?
Our catalog currently lists 27 drivetrain parts for the 1978 Excalibur Phaeton across 7 subcategories and 9 brands, covering the 7.4L 454cid V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of drivetrain problems on a 1978 Excalibur Phaeton?
Common symptoms include clicking in tight turns, a clunk when shifting between drive and reverse, vibration that builds with speed, or gear oil on the inside of a wheel. 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 differential or transfer-case fluid with any axle or seal job while everything is already open.
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 1978 Excalibur Phaeton 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 1978 Excalibur Phaeton?
Every part on this page is matched to the 7.4L 454cid V8 engine. Then a torn CV boot caught early is a cheap boot kit; caught late it is a whole axle — inspect before deciding which to buy. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1978 Excalibur Phaeton
Drivetrain Parts for Other Excalibur Phaeton Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.