1985 GMC Engine Oil Pump Parts
Choose a Model for your 1985 GMC
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- High Performance Oil Pump
- 25% Higher Volume High Performance Oil Pump 10 PSI Higher Pressure Relief Spring Installed Exclusive Billet Steel Shark Tooth Helical Pump Gears Drive & Idler Shafts Extended Into Cover Includes 12550 Chrome Moly Steel Intermediate Shaft With Steel Guide Threaded Pressure Relief Nut Includes Optional Pressure Springs (-10 PSI And +10 PSI) Uses 3/4 Inch Diameter Press-Fit Or Bolt-On Pickup Tube Assembly (Not Included) Includes Oil Pump Pickup Tube Gasket, Assembly Bolts, And Wrench
- 10555ST High Performance, High Volume, High Pressure, Billet Steel Oil Pump With Gasket
- Performance
- Product Attributes:
- Oil Pump Pressure Type: High Pressure
- Additional Volume Over Stock Percentage: 25%
- Adjustable Bypass Pressure: Yes
- Alternate Pressure Springs Included: Yes
- Grade Type: Performance
- Mounting Hole Diameter:
- 0.240
- 6.00
- Anti-Cavitation: No
- Manufactured For: Gm Sbc
- Screen Information: 3/4" Bolt On/press In
- Mounting Hole Quantity: 2
- Upgrade for Pump Number: N/a
- Additional Cover Shaft Support: Yes
- Gear Material: Billet Steel
- Oil Pump Volume Type: High Volume
- Manufactured Pressure: (pink) 70 Psi
- Optional Spring Pressure 1: (yellow) 58 Psi
- Gasket Or Seal Included: Yes
- Gear Type: Shark Tooth Helical Gear
- Optional Spring Pressure 2: (green) 80 Psi
- Drive Shaft Included: Yes
- Drive Type: Drive Shaft
- Pickup Tube Diameter:
- 0.750
- 19.00
- Oil Pump Type: Gear
-
Features:
- Extended drive and idler shaft for additional support in the cover eliminating dynamic shfaft deflection at increased RPM levels.
- Features billet steel "Shark Tooth" helical gears.
- Relief hole in cover uses screw in plug instead of pressed cup plug.
- Housing and Cover are CNC machined and phosphate coated.
- Includes +10PSI higher pressure relief spring and optional -10PSI relief spring.
- Screw in plug retains relief valve spring instead of pin.
- Cover is doweled to the pump housing to assure alignment of the shaft bores.
- Includes 12550 chrome moly intermediate shaft with steel guide.
- Made in USA. Melling high performance oil pumps provide dependable performance every time in every application under the toughest RPM conditions. The Melling high performance cast iron oil pump series features a doweled housing and cover, extended drive and idler shafts for additional support at increased RPM’s, a screw in relief spring plug, CNC machined cover and housing that is manganese phosphate coated, standard volume and high volume patented billet Shark Tooth gears, and a chrome moly drive shaft with steel guide. Includes lower pressure spring and self locking socket head bolts with wrench for use with bolt on screen pumps. Every Melling high performance oil pump is individually tested for pressure and flow under actual engine operating conditions. Melling high performance Shark Tooth oil pumps are recommended for all applications where a high performance oil pump is needed.
This Part Fits the Following OEM/Substitute Numbers:
10555ST
Additional Fitment Information:
| Vehicle | Fuel Type |
|---|---|
| 1985 - GMC Jimmy | GAS |
- High Performance Oil Pump
- 25% Higher Volume High Performance Oil Pump 15 PSI Higher Pressure Relief Spring Installed Billet Steel Pump Gears Drive & Idler Shafts extended Into Cover Includes 12770 Chrome Moly Steel Intermediate Shaft With Steel Guide Includes Optional Standard Pressure Spring Uses 3/4 Inch Diameter Press-Fit Pickup Tube Assembly (Not Included)
- 10778 High Performance, High Volume, High Pressure, Billet Steel Oil Pump
- Performance
- Product Attributes:
- Oil Pump Pressure Type: High Pressure
- Additional Volume Over Stock Percentage: 25%
- Adjustable Bypass Pressure: Yes
- Alternate Pressure Springs Included: Yes
- Grade Type: Performance
- Mounting Hole Diameter:
- 0.240
- 6.00
- Anti-Cavitation: No
- Manufactured For: Gm Bbc
- Screen Information: 3/4" Press In
- Mounting Hole Quantity: 2
- Upgrade for Pump Number: 10770
- Additional Cover Shaft Support: Yes
- Gear Material: Billet Steel
- Oil Pump Volume Type: High Volume
- Manufactured Pressure: (pink) 70 Psi
- Optional Spring Pressure 1: (plain) 52 Psi
- Gasket Or Seal Included: No
- Gear Type: Spur Gear
- Optional Spring Pressure 2: N/a
- Drive Shaft Included: Yes
- Drive Type: Drive Shaft
- Pickup Tube Diameter:
- 0.750
- 19.00
- Oil Pump Type: Gear
-
Features:
- Includes +15 PSI higher pressure relief spring installed and optional standard pressure relief spring.
- Extended drive and idler shaft for additional support in the cover eliminating dynamic shfaft deflection at increased RPM levels.
- Billet steel gears.
- Cover is doweled to the pump housing to assure alignment of the shaft bores.
- 25% volume increase over standard oil pump.
- Includes 12770 chrome moly intermediate shaft with steel guide.
- Cast Iron Housing
- High volume performance upgrade for the 10770.
- Made in USA. Melling high performance oil pumps provide dependable performance every time in every application under the toughest RPM conditions. High volume performance upgrade for the 10770. Increase in volume of 25% over stock oil pump. The drive shaft has been manufactured from chrome-moly steel. The drive and idler shafts have been extended to allow for additional support in the cover. Additional support eliminates dynamic shaft deflection at increased RPM levels. The cover is doweled to the pump housing to assure alignment of the shaft bores. The relief valve has a screw-in plug instead of a pin. The housing and cover are CNC machined and phosphate coated. An additional spring, the original stock replacement is supplied which will reduce bypass pressure if needed. Includes 12770 chrome moly intermediate shaft with steel guide. Built with billet steel gears. Every Melling high performance oil pump is individually tested for pressure and flow under actual engine operating conditions.
This Part Fits the Following OEM/Substitute Numbers:
10778, DM-77HVP
Additional Fitment Information:
| Vehicle |
|---|
| 1985 - GMC K3500 |
Additional Fitment Information:
| Vehicle |
|---|
| 1985 - GMC G1500 |
Additional Fitment Information:
| Vehicle | Block | CC | Engine | CID |
|---|---|---|---|---|
| 1985 - GMC P2500 | L | - | 6 Cyl 4.8L | 292 |
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