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- Grease/Oil Seal
- 8.25 in., 9.25 in. Ring Gear
- Vent holes allow lubricants to flow freely around the seal lip - cooling seal components and removing heat build-up
Additional Fitment Information:
| Vehicle | Position | Drive Type |
|---|---|---|
| 1977 - GMC K25 | Front | 4WD |
- Differential Pinion Seal
- Viton Type with 8.5 (in) Ring Gear with Spicer 44-5CFHD Axle
- National 5778V Differential Pinion Seal
- Product Attributes:
- Inside Diameter:
- 1.552
- 39.420
- Shaft (Inch): 1.552
- Width (Inch): 0.645
- Unit of Dimension: Inch
- Housing Bore (Inch): 3.160
- Outside Diameter:
- 3.165
- 80.390
- Outside Diameter (Inch): 3.165
- Shaft (MM): 39.420
- Part Description: Oil Seal
- Inside Diameter:
- National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
Additional Fitment Information:
| Vehicle | Position |
|---|---|
| 1977 - GMC K25 | Front Outer |
- Differential Pinion Seal
- Viton Type with 8.5 (in) Ring Gear with Spicer 44-5F Axle
- National 5778V Differential Pinion Seal
- Product Attributes:
- Inside Diameter:
- 1.552
- 39.420
- Shaft (Inch): 1.552
- Width (Inch): 0.645
- Unit of Dimension: Inch
- Housing Bore (Inch): 3.160
- Outside Diameter:
- 3.165
- 80.390
- Outside Diameter (Inch): 3.165
- Shaft (MM): 39.420
- Part Description: Oil Seal
- Inside Diameter:
- National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
Additional Fitment Information:
| Vehicle | Position |
|---|---|
| 1977 - GMC K25 | Front Outer |
- Differential Pinion Seal
- with 8.5 (in) Ring Gear with GMC Axle
- National 2043 Differential Pinion Seal
- Product Attributes:
- Inside Diameter:
- 1.940
- 49.280
- Shaft (Inch): 1.940
- Width (Inch): 0.500
- Unit of Dimension: Inch
- Housing Bore (Inch): 2.762
- Outside Diameter:
- 2.766
- 70.260
- Outside Diameter (Inch): 2.766
- Redicoat: Yes
- Shaft (MM): 49.280
- Part Description: Oil Seal
- Inside Diameter:
- National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
This Part Fits the Following OEM/Substitute Numbers:
12305068, 1236324, 1242066, 1242067, 1242068, 1243465, 1243467, 1496123, 19273, 2043, 249A16008C, 26033578, 292-7, 3633518, 396470, 404294, 4319273, 46476...VIEW MORE
Additional Fitment Information:
| Vehicle | Position |
|---|---|
| 1977 - GMC K25 | Rear Outer |
- Differential Pinion Seal
- Viton Type with 8.5 (in) Ring Gear with Spicer 44-8F Axle
- National 5778V Differential Pinion Seal
- Product Attributes:
- Inside Diameter:
- 1.552
- 39.420
- Shaft (Inch): 1.552
- Width (Inch): 0.645
- Unit of Dimension: Inch
- Housing Bore (Inch): 3.160
- Outside Diameter:
- 3.165
- 80.390
- Outside Diameter (Inch): 3.165
- Shaft (MM): 39.420
- Part Description: Oil Seal
- Inside Diameter:
- National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
This Part Fits the Following OEM/Substitute Numbers:
04746772, 05012454AA, 05012454AB, 05012846AB, 05019154AA, 10112635, 15788, 15791, 35723, 3979616, 41455, 41455-1, 46053, 46648, 4746772, 5012454AA, 5012454AB, 5012846AB...VIEW MORE
Additional Fitment Information:
| Vehicle | Position |
|---|---|
| 1977 - GMC K25 | Front Outer |
- Differential Pinion Seal
- with 10.5 (in) Ring Gear with GMC Axle
- National 2286 Differential Pinion Seal
- Product Attributes:
- Shaft (Inch): 2.201
- Width (Inch): 0.590
- Redicoat: Yes
- Flanged Outside Diameter (Inch): 3.970
- Inside Diameter:
- 2.201
- 55.910
- Flanged Outside Diameter (MM): 100.838
- Unit of Dimension: Inch
- Housing Bore (Inch): 3.519
- Outside Diameter:
- 3.523
- 89.480
- Outside Diameter (Inch): 3.523
- Shaft (MM): 55.910
- Part Description: Oil Seal
- National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
This Part Fits the Following OEM/Substitute Numbers:
12305328, 21955, 2286, 26004811, 292-128, 3977359, 4321955, 47530, N21955, YMS2286
Additional Fitment Information:
| Vehicle | Position |
|---|---|
| 1977 - GMC K25 | Rear Outer |
- Differential Pinion Seal
- Nitrile with 8.5 (in) Ring Gear with Spicer 44-5F Axle
- National 5778 Differential Pinion Seal
- Product Attributes:
- Inside Diameter:
- 1.552
- 39.420
- Shaft (Inch): 1.552
- Width (Inch): 0.645
- Unit of Dimension: Inch
- Housing Bore (Inch): 3.160
- Outside Diameter:
- 3.165
- 80.390
- Outside Diameter (Inch): 3.165
- Redicoat: Yes
- Shaft (MM): 39.420
- Part Description: Oil Seal
- Inside Diameter:
- National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
Additional Fitment Information:
| Vehicle | Position |
|---|---|
| 1977 - GMC K25 | Front Outer |
- Differential Pinion Seal
- Nitrile with 8.5 (in) Ring Gear with Spicer 44-5CFHD Axle
- National 5778 Differential Pinion Seal
- Product Attributes:
- Inside Diameter:
- 1.552
- 39.420
- Shaft (Inch): 1.552
- Width (Inch): 0.645
- Unit of Dimension: Inch
- Housing Bore (Inch): 3.160
- Outside Diameter:
- 3.165
- 80.390
- Outside Diameter (Inch): 3.165
- Redicoat: Yes
- Shaft (MM): 39.420
- Part Description: Oil Seal
- Inside Diameter:
- National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
Additional Fitment Information:
| Vehicle | Position |
|---|---|
| 1977 - GMC K25 | Front Outer |
- Differential Pinion Seal
- Nitrile with 8.5 (in) Ring Gear with Spicer 44-8F Axle
- National 5778 Differential Pinion Seal
- Product Attributes:
- Inside Diameter:
- 1.552
- 39.420
- Shaft (Inch): 1.552
- Width (Inch): 0.645
- Unit of Dimension: Inch
- Housing Bore (Inch): 3.160
- Outside Diameter:
- 3.165
- 80.390
- Outside Diameter (Inch): 3.165
- Redicoat: Yes
- Shaft (MM): 39.420
- Part Description: Oil Seal
- Inside Diameter:
- National® has built a reputation as one of the most respected names in the industry. We have offered premium sealing solutions for more than 75 years. Our design team keeps pace with the industry and provides advanced solutions for today’s vehicles.
This Part Fits the Following OEM/Substitute Numbers:
010701, 05012454AA, 05012454AB, 05019154AA, 10046337, 127968R91, 129418R91, 129419R91, 14223, 142234, 152205, 15788, 1728192, 1791590, 184160, 199379, 199379X1, 2067211...VIEW MORE
Additional Fitment Information:
| Vehicle | Position |
|---|---|
| 1977 - GMC K25 | Front Outer |
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