bing tracking image
  1. Trailer Bearings Races Seals Caps
  2. Redline
  3. Seals
  4. Oil Seals
  5. 3.779 Inch O.D.
  6. 2.750 Inch I.D.
Unitized Oil Seal

Unitized Oil Seal

Our Price: $37.48
Trailer Bearings Races Seals Caps
Shipping Weight: 0.27 lbs
Add to cart
Redline Trailer Bearings Races Seals Caps - 91030
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Need help with installation?
Locate installers near me
Great Prices for the best trailer bearings races seals caps from Redline. Unitized Oil Seal part number 91030 can be ordered online at or call 1-800-940-8924 for expert service.
  • All Info
  • Reviews (6)
  • Q & A (0)
  • Photos

Redline Trailer Bearings Races Seals Caps

  • Seals
  • Oil Seals
  • 3.779 Inch O.D.
  • 2.750 Inch I.D.
  • Redline

Inner Diameter (ID) Outer Diameter (OD) Use With:
2.75" 3.779" Hayes #99 Spindle

Seal Cross-Reference
Dexter # Transcom # National # Hayes # Chicago Rawhide #
- OB27377 B370352BG 091030 CR27438

91030 Unitized Oil Seal

Item # 91030

Customer Satisfaction Score:

Customer Reviews

Unitized Oil Seal - 91030

Average Customer Rating:  5.0 out of 5 stars   (6 Customer Reviews)


Fantastic customer service.


excellent service got the parts I needed and very quickly


Correct seal that fits well!





See what our Experts say about this Redline Trailer Bearings Races Seals Caps

  • Is Oil Seal 91030 Replacement for TKS Seal 568303?
    Though I'm not sure what you mean by "premium" I can tell you that Oil Seal # 91030 does have the exact same 2.750" inner diameter and 3.779" outer diameter of the TKS seal 568303 that is used on AL-KO axles so it will work as a replacement.
    view full answer...
  • Seals Needed to replace Seal Part # 91030-N on a Hayes 10,000 Pound Axle for a Dump Trailer
    The correct oil seal for your for your Hayes trailer axle is the Redline Oil Seal, item # 91030. This seal fits an inner mating surface of 2.750 inches and has on outer diameter of 3.779 inches. It is used on many of the Hayes axles up to 10,000 pounds and using the #99 spindle.
    view full answer...
  • Can Oil Seal be Used on Grease Hubs
    An oil seal like the Redline # 91030 with an inner diameter of 2.750 inches and an outer diameter of 3.779 inches can be used with a grease hub. As long as this is the correct size and it is compatible with your spindle, it will work just fine. All you will need to do to convert to grease hubs is remove all the oil, pack the hubs with grease like # L11390 and obtain new grease caps. Just make sure that you clean all of the oil off completely so it does not mix with the grease. I have...
    view full answer...
  • Bearings and Seal Used for AL-KO 7290 Trailer Hubs for #99 Spindles
    The 7290 that you see is a casting number. It is found on AL-KO hubs that fit #99 spindles. I found that the bearings used are # 28580 which would be the inner bearing and # 25580 which would be the outer bearing. For the seal use # 91030.
    view full answer...
  • Replacement Grease Seal for 9,000 Lbs Axle with Kodiak Disc Brakes
    Yes the Oil Seal # 91030 is the correct seal for your 2018 DRV Mobile Suites with 9K axles. An oil seal can be used in a greased hub as long as it is the correct size and all the oil is removed since mixing oil and grease is not recommended. You can also measure the inner and outer diameters of the seal with 4" Carbon Fiber Digital Caliper # PTW80157 and compare those measurements to the Redline seal, 2.750 Inch I.D. and 3.779 Inch O.D.
    view full answer...
  • Oil Seal for 10K Quality Axles with Seal 27438
    On oil bath hubs the seals are different than standard grease seals. The correct replacement for what you have is # 91030. Unitized oil seals like this have a part that stays fixed and a part that rotates with the hub for optimum leak protection. I have linked a video review of it for you.
    view full answer...
  • Replacement Oil Seal for AL-KO 568303
    To replace your AL-KO 568303 seal you will want the Oil Seal # 91030. This seal has the same inner diameter of 2.750 inches and outer diameter of 3.779 inches. It is a confirmed fit for your #99 spindle that uses the AL-KO 568303 seal.
    view full answer...
  • Can Oil Seal be Used in Place of Grease Seal
    So long as the dimensions are what you need, you can use an oil seal as opposed to a grease seal on your trailer hub. For example, the Oil Seal # 10-63 and Grease Seal # GS-2250DL both have 2.250" inner diameters and 3.376" outer diameters so they are compatible. If you are in the process of changing out your bearings and seals, I have added links to help articles on how to replace them as well as a link to our entire selection of bearings, races and seals for you to check out.
    view full answer...
  • Bore Sealant for Trailer Oil Seals
    RTV high temperature silicone is what you are looking for. So something such as # LT37464, # LT37467, or # LT37466 would work for you. This is for oil seals that have metal on the outsides like # 91030. No sealant can get on the rubber parts. Just a little bit all the way around should be all you need.
    view full answer...
  • Availability Of Replacement Bearings 28580, 25580, and Oil Seal 370352 For AL-KO 10,000lb Axle
    I would be happy to piece together the replacement components you are looking for to rebuild your AL-KO 10,000lb axle, but we do not have them in a kit. You will need the following parts: Bearing # 25580 Race # 25520 Bearing # 28580 Race # 28521 Oil Seal # 91030 You will also need oil # XLPROLUBE.
    view full answer...
  • Will The Kodiak Disc Brake Kit K2HR10A11RERR Fit An AL-KO 10k #99 Spindle?
    The Kodiak Disc Brake Kit # K2HR10A11RERR is actually specifically designed to fit an AL-KO 10k #99 spindle, so this will be a perfect replacement. Though this does include the oil cap, it should be noted that it does not include the bearings or seal. I have the ones that will fit this and your spindle listed below, just in case. Replacement Trailer Hub Bearing # 25580 Replacement Trailer Hub Bearing # 28580 Replacement Oil Seal # 91030
    view full answer...
  • What Bearings, Races and Grease Seal does Kodiak K2HR10A11RERR 10K Disc Brake Kit Use
    The Kodiak # K2HR10A11RERR 10K disc brake kit uses a # 28580 inner and a # 25580 outer bearing along with a # 91030 grease seal. The inner race is # 28521 and the outer is # 25520.
    view full answer...
  • Correct Replacement Braking Assemblies for an Older Hayes AL-KO 12K Axle
    I am assuming you're looking for a replacement braking assembly for your older Hayes AL-KO axle. If so, you're going to just need the Hayes/AL-KO Hydraulic Brake Kit - Duo Servo - 12-1/4" # K23-524-00-2 or just # K23-524-00 for one assembly. You mention that you have a 6-bolt mounting flange, and while it's true the older Hayes axles had 6-bolt flanges it only actually used 5 to mount. If you're also needing replacement inner/outer bearings as well as an oil seal, you can use # 28580...
    view full answer...
    Image 1 for

Do you have a question about this Trailer Bearings Races Seals Cap?

Info for this part was:

Employee Robert G
Expert Research:
Robert G
Employee Jeff D
Installed by:
Jeff D
Employee Jacob T
Video Edited:
Jacob T
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Eric H
Updated by:
Eric H

At we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.