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  See more parts for Ford Bronco
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Yukon Gear & Axle Standard Open Spider Gear Kit for 9 Inch Ford, 31 Spline, 2-Pinion - YPKF9-S-31-2

If you're looking to keep your classic Ford running smooth and strong, check out the Yukon Gear & Axle spider gear kit. This isn't just any replacement; it's built with better materials and manufacturing processes than what you’d find in OEM parts. That means you get a spider gear set that’s going to last longer and handle whatever you throw at it.

This kit comes with everything you need for a complete swap. You’ll find two side gears, two pinion gears, a cross pin shaft, a roll pin, and even the thrust washers. It's like a full toolbox in one package, making your life a whole lot easier when it's time to tackle that differential rebuild.

Features:

  • Spider gear kit designed for Ford 9" open differentials with 31 spline axles
  • Includes all necessary components for a proper replacement

Specifications:

  • Grade Type: Regular

This kit fits a bunch of classic Ford models, so if you’ve got a Bronco from '66 to '86 or an F-150 from '75 to '87, you’re in luck. Here’s a quick rundown of what it fits:

  • Ford Bronco 1966-1986
  • Ford E-100 1975-1978
  • Ford F-100 1957-1983
  • Ford F-150 1975-1987
  • Ford Fairlane 1957-1970
  • Ford Falcon 1960-1970
  • Ford Galaxie 1959-1967
  • Ford Galaxie 500 1968-1974
  • Ford Gran Torino 1972-1976
  • Ford Granada 1975-1979
  • Ford LTD 1967-1979
  • Ford Maverick 1970-1977
  • Ford Mustang 1965-1973
  • Ford Ranchero 1957-1979
  • Ford Thunderbird 1955-1979
  • Lincoln Continental 1961-1979
  • Lincoln Mark III 1969-1971
  • Mercury Comet 1964-1969 & 1971-1977
  • Mercury Cougar 1967-1979
  • Mercury Grand Marquis 1975-1978 & 1980

So whether you're restoring a classic or just need to keep your daily driver in top shape, this Yukon spider gear kit has got your back. It’s a solid choice that won't let you down.

Proposition 65

⚠ WARNING: Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov

Vehicle
1966-1986
 Ford Bronco
1975-1978
 Ford E-100
1957-1983
 Ford F-100
1975-1987
 Ford F-150
1957-1970
 Ford Fairlane
1960-1970
 Ford Falcon
1959-1967
 Ford Galaxie
1968-1974
 Ford Galaxie 500
1972-1976
 Ford Gran Torino
1975-1979
 Ford Granada
1967-1979
 Ford LTD
1970-1977
 Ford Maverick
1965-1973
 Ford Mustang
1957-1979
 Ford Ranchero
1955-1979
 Ford Thunderbird
1961-1979
 Lincoln Continental
1969-1971
 Lincoln Mark III
1964-1969, 1971-1977
 Mercury Comet
1967-1979
 Mercury Cougar
1975-1978, 1980
 Mercury Grand Marquis
Yukon's mission is to build quality parts that exceed your expectations. We achieve this through state-of-the-art product design and an in-house engineering team. Our parts are then produced by leaders in OEM manufacturing and endure rigorous testing.
Yukon Gear & Axle ("Yukon") warrants the original retail purchaser that all Yukon products will be free from defects in materials and workmanship for the periods shown herein. Yukon makes no other warranty of any kind, express or implied. All other warranties, including but not limited to an implied warranty of merchantability or fitness for a particular purpose, are excluded. This warranty is offered provided that the Yukon product has been installed and maintained in accordance with Yukon instructions, and that it has not been subject to modification, accident, abnormal use or misuse. At Yukon's discretion, this warranty may be voided if installation of Yukon product(s) occurs on vehicles with tires that exceed Yukon Maximum Recommended Tire Size.

Upon notification of a warranty claim, Yukon shall investigate the claim of defect, and, in the event of a verified defect, shall, at their sole choice, either repair the defective product, replace it, or refund the purchase price.

This warranty does not cover, and Yukon shall not be liable for, incidental or consequential damages, including loss of time, road service charges, labor charges, inconvenience, loss of vehicle use, loss of revenues, or loss or damage to personal property (including loss or damage to vehicle parts due to the failure of the Yukon product)*. In addition, this warranty does not cover, and Yukon shall not be liable for, any undertaking, representation, or agreements made by dealers or other third parties selling Yukon Gear & Axle products, except where such agreements are within the provisions of this Warranty statement. Also, this warranty does not cover damage to the axle caused by or facilitated by failure of a non-Yukon component.

This agreement offers you specific legal rights. You may also have other rights which vary from state to state.

YUKON WARRANTY BY PRODUCT

Spool
  • Length:As long as original purchaser owns vehicle in which Spool is originally installed
  • Notes:It is normal for Spools to cause tire chatter, squeal, or scrubbing when vehicle is not moving in a straight line. Both rear tires must measure the same height from ground to top of wheel for Spool to function properly without premature wear.
Super Joint
  • Length:As long as original purchaser owns vehicle in which Super Joint is originally installed
  • Notes:Warranty coverage is for breakage of cross section or caps only. Failure by wear or galling is not covered.
YP - Series Products (other than Spool and Super Joint)
  • Length:One (1) Year
  • Notes:Covers parts for one year against manufacturers defects.
Front Axle (1541H)
  • Length:Ten (10) Years
  • Notes:Covers parts for ten years against manufacturing defects.
Rear Axle (1541H)
  • Length:Ten (10) Years
  • Notes:Covers parts for ten years against manufacturing defects.
Rear Axle 4340 (YA W)
  • Length:Limited Lifetime
  • Notes:Limited Lifetime warranty covering manufacturing defects and axle breakage for as long as you own the vehicle. This warranty is not transferable to another party. "No Questions Asked" replacement for first warranty return, however, Yukon reserves the right to either replace axle or refund original purchase price after the first warranty claim. Yukon (through RANDYS Worldwide Automotive) makes final determination on warranty considerations.
Front Axle (Series YA W)
  • Length:Limited Lifetime
  • Notes:Limited Lifetime warranty covering manufacturing defects and axle breakage for as long as you own the vehicle. This warranty is not transferable to another party. "No Questions Asked" replacement for first warranty return, however, Yukon reserves the right to either replace axle or refund original purchase price after the first warranty claim. Yukon (through RANDYS Worldwide Automotive) makes final determination on warranty considerations.
Ring & Pinion Gear Set
  • Length:One (1) Year
  • Notes:Warrantied against manufacturing defects for one (1) year.
Positraction Differential
  • Length:One (1) Year
  • Notes:Exclusions apply, does not cover premature clutch wear or abuse. It is normal for Positraction differentials to cause tire chatter, squeal, or scrubbing when vehicle is not moving in a straight line. Both rear tires must measure the same height from ground to top of wheel for differential to function properly without premature wear. Limited slip additive or appropriate friction modifier must be used with oil to reduce Positraction chatter.
Zip Locker (YZL)
  • Length:Six (6) Years
  • Notes:All Zip Lockers come with a six (6) year warranty against manufacturer defect, including any collaterally damaged parts and associated labor, up to $2,000*, for the first two (2) years. Collaterally damaged parts must be submitted for inspection. Receipts for parts and associated labor must be submitted as well. Only claims deemed reasonable by Yukon Gear & Axle will be accepted. Offer may be discontinued without advance notice.
Grizzly Locker (YGL)
  • Length:One (1) Year
  • Notes:Covers the replacement of the unit and any collaterally damaged parts and associated labor, up to $2,000. Collaterally damaged parts must be submitted for inspection. Receipts for parts and associated labor must be submitted as well. Only claims deemed reasonable by Yukon Gear & Axle will be accepted. Offer may be discontinued without advance notice.
Yokes
  • Length:One (1) Year
  • Notes:Covers parts for one year against manufacturing defects.
Carriers (YC)
  • Length:One (1) Year
  • Notes:Covers parts for one year against manufacturing defects.
Tools (YT)
  • Length:One (1) Year
  • Notes:Covers parts for one year against manufacturing defects.
Install Kits
  • Length:One (1) Year
  • Notes:Includes BK, MK, PK, and YK. Covers parts for one year against manufacturing defects.
Spider Gear Kits (YPK)
  • Length:One (1) Year
  • Notes:One year against manufacturing defects. Exclusions apply, does not cover clutch wear in limited slip differentials.
YHC Drive Flanges
  • Length:Limited Lifetime
  • Notes:Limited Lifetime warranty covering manufacturing defects and breakage for as long as you own the vehicle. This warranty is not transferable to another party. "No Questions Asked" replacement for first warranty return, however, Yukon reserves the right to either replace the part or refund original purchase price after the first warranty claim. Yukon (through RANDYS Worldwide Automotive) makes final determination on warranty considerations.
Yukon Hardcore Locking Hubs
  • Length:Limited Lifetime
  • Notes:Limited Lifetime warranty covering manufacturing defects and breakage for as long as you own the vehicle. This warranty is not transferable to another party. "No Questions Asked" replacement for first warranty return, however, Yukon reserves the right to either replace the part or refund original purchase price after the first warranty claim. Yukon (through RANDYS Worldwide Automotive) makes final determination on warranty considerations
Driveshafts
  • Length:One (1) Year
  • Notes:Warrantied against manufacturing defects for one (1) year. Longer warranty is available through purchase of a Y.E.S. plan.

Installation Instructions

Click to view the Installation Instructions here

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