Home› Driveline and Axles > Gaskets and Sealing Systems› Timken 8181NA Differential Pinion Seal - Rear
Timken 8181NA Differential Pinion Seal - RearOE Quality 60-Day Returns
Part #: 8181NA

Timken 8181NA Differential Pinion Seal - Rear

Rear
129 vehicles fit this part
Select your vehicle to confirm fitment
Verify this part fits before purchasing — free returns if it doesn't
$26.19Free Shipping
Free ShippingNo Cost to Continental U.S.
Free Returns*Wrong fit? No cost
60-Day ReturnsMoney back guarantee
*Free return shipping only qualifies if our fitment verification tool is used.
In Stock · Ready To Ship Most orders ship same-day if ordered before 1pm CST.
OE Direct Replacement — Bolt-on fit, no modifications needed
Fitment: Ford and Mercury, Fairmont, Bobcat, E-100 Econoline, E-100 Econoline Club Wagon, E-150 Econoline, E-150 Econoline Club Wagon, F-100, F-150, Granada, LTD, Mustang II, Pinto, Thunderbird, Monarch, Custom 500, Maverick, Comet, Montego, Gran Torino, Ranchero, Torino, Mustang, Cyclone, Fairlane, Falcon, and Cougar
Easy Returns — Return within 60 days for a full refund
Fast Shipping — Most orders ship same business day before 1pm CST
Not what you need? See all Differential Pinion Seal options

Timken 8181NA Differential Pinion Seal Overview

The Timken 8181NA differential pinion seal is designed for reliable sealing performance in driveline systems. This seal is compatible with various Ford and Mercury models, ensuring proper fit and function in your vehicle's differential assembly.

  • Compatible with Ford and Mercury vehicles including Mustang, F-150, Thunderbird, and Econoline series
  • Durable construction to prevent oil leaks and maintain differential integrity
  • Precision fit for differential pinion shafts to reduce wear and tear
  • OEM-quality replacement part for driveline and axle sealing systems
  • Part number 8181NA ensures exact match for specified applications

Product Details and Compatibility

The Timken 8181NA differential pinion seal is engineered to meet the specifications required for a range of Ford and Mercury vehicles. It fits models such as the Ford Mustang, F-150, F-100, and Econoline vans including E-100 and E-150 Club Wagon variants, as well as Mercury Cougar, Monarch, and Montego. This seal is part of the driveline and axles category, specifically designed to maintain the integrity of the differential by preventing fluid leaks around the pinion shaft.

Applications and Problem Solving

This differential pinion seal is used to address common driveline issues related to oil leakage and contamination. It helps resolve:

  • Oil leaks from the differential pinion shaft area
  • Premature wear of differential components due to fluid loss
  • Contamination of differential fluid by dirt and debris
  • Noise and vibration caused by improper sealing
  • Maintaining proper lubrication for differential gears

Installation Notes and Tips

When installing the Timken 8181NA differential pinion seal, ensure the differential housing and pinion shaft are clean and free of debris. Use appropriate tools to avoid damaging the seal during installation. Verify the seal is seated evenly to prevent leaks. It is recommended to inspect related components such as bearings and gears during replacement to ensure overall driveline health.

Quality Assurance and Warranty

Timken manufactures the 8181NA differential pinion seal to meet strict quality standards for durability and performance. While specific warranty details may vary, Timken products typically come with a limited warranty against defects in materials and workmanship. This ensures confidence in the seal’s reliability for your Ford or Mercury vehicle’s driveline system.

This part fits 129 vehicles. Search below:

YearMakeModelPositionNotes
1983FordFairmontRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1982FordFairmontRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1981FordFairmontRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1980FordFairmontRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1980MercuryBobcatRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1979FordFairmontRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1979MercuryBobcatRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1978FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordE-100 Econoline Club WagonRearFits 7.75 in. Ring Gear Differential Bearing
1978FordE-100 Econoline Club WagonRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordE-150 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1978FordE-150 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordE-150 Econoline Club WagonRearFits 7.75 in. Ring Gear Differential Bearing
1978FordE-150 Econoline Club WagonRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordF-100RearFits 7.75 in. Ring Gear Differential Bearing
1978FordF-100RearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordF-150RearFits 7.75 in. Ring Gear Differential Bearing
1978FordF-150RearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordFairmontRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordLTDRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordPintoRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978FordPintoRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1978FordThunderbirdRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978MercuryBobcatRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1978MercuryBobcatRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1978MercuryMonarchRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1977FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordE-100 Econoline Club WagonRearFits 7.75 in. Ring Gear Differential Bearing
1977FordE-100 Econoline Club WagonRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordE-150 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1977FordE-150 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordE-150 Econoline Club WagonRearFits 7.75 in. Ring Gear Differential Bearing
1977FordE-150 Econoline Club WagonRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordF-100RearFits 7.75 in. Ring Gear Differential Bearing
1977FordF-100RearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordF-150RearFits 7.75 in. Ring Gear Differential Bearing
1977FordF-150RearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordLTDRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordPintoRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977FordPintoRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1977FordThunderbirdRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977MercuryBobcatRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1977MercuryBobcatRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1977MercuryMonarchRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1976FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordE-100 Econoline Club WagonRearFits 7.75 in. Ring Gear Differential Bearing
1976FordE-100 Econoline Club WagonRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordE-150 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1976FordE-150 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordE-150 Econoline Club WagonRearFits 7.75 in. Ring Gear Differential Bearing
1976FordE-150 Econoline Club WagonRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordF-100RearFits 7.75 in. Ring Gear Differential Bearing
1976FordF-100RearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordF-150RearFits 7.75 in. Ring Gear Differential Bearing
1976FordF-150RearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordLTDRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordPintoRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976FordPintoRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1976FordThunderbirdRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976MercuryBobcatRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1976MercuryBobcatRear8 Inch Ring Gear; From 11/1976
1976MercuryMonarchRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1976MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1975FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1975FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975FordE-100 Econoline Club WagonRearFits 7.75 in. Ring Gear Differential Bearing
1975FordE-100 Econoline Club WagonRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975FordE-150 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1975FordE-150 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975FordE-150 Econoline Club WagonRearFits 7.75 in. Ring Gear Differential Bearing
1975FordE-150 Econoline Club WagonRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975FordF-100RearFits 7.75 in. Ring Gear Differential Bearing
1975FordF-100RearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975FordF-150RearFits 7.75 in. Ring Gear Differential Bearing
1975FordF-150RearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975FordLTDRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975FordPintoRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975FordPintoRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1975FordThunderbirdRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975MercuryBobcatRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1975MercuryMonarchRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1975MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1974FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1974FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1974FordPintoRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1974FordPintoRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1974MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1973FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1973FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1973FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1973FordPintoRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1973FordPintoRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1973MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1972FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1972FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1972FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1972FordPintoRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1972MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1971FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1971FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1971FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1971FordPintoRearDifferential Pinion Bearing - Fits 6.75 in. Ring Gear
1971MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1970FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1970FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1970FordMustangRearCompatible with manual transmission, 7.25" ring gear, includes differential pinion seal.
1970FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1970MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1969FordE-100 EconolineRearFits 7.75 in. Ring Gear Differential Bearing
1969FordE-100 EconolineRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1969FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1969FordMustangRearCompatible with manual transmission, 7.25" ring gear, includes differential pinion seal.
1969MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1968FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1968FordMustangRearCompatible with manual transmission, 7.25" ring gear, includes differential pinion seal.
1968MercuryCougarRearWCZ, WDJ Axles - 8 in. Ring Gear
1968MercuryMontegoRear7.5 in., 7.75 in., 8 in. Ring Gear - WCY, WEZ Axles
1967FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1967FordMustangRearCompatible with manual transmission, 7.25" ring gear, includes differential pinion seal.
1967MercuryCougarRearWCZ, WDJ Axles - 8 in. Ring Gear
1966FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1966FordMustangRearCompatible with manual transmission, 7.25" ring gear, includes differential pinion seal.
1965FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1965FordMustangRearCompatible with manual transmission, 7.25" ring gear, includes differential pinion seal.
1964FordMustangRearCompatible with 8 Inch Ring Gear transfer case output shaft bearing.
1964FordMustangRearCompatible with manual transmission, 7.25" ring gear, includes differential pinion seal.

* Always verify fitment with your vehicle's VIN if unsure. Submodel & trim restrictions may apply.

This part directly replaces or is cross-referenced with the following part numbers:

Cross-reference numbers are provided for identification purposes only. Always confirm fitment before ordering.