Recommended Dexter Fortress Threaded Aluminum Oil Cap to Replace a Dexter 021-036-00 Cap

Question

Question:

I’m wanting to upgrade my clear plastic oil caps dexter part number 021–036–00 to these aluminum caps. Will these fit? It’s going on a 2003 model big Tex trailer with Dexter 10,000 pound axles.

asked by: Clint S

0

Expert Reply:

Yes, they will! The Dexter Fortress Threaded Aluminum Oil Cap item # DX39CR is a replacement for Dexter's 021-036-00 cap. It fits 4" threaded hubs and is easy to access to fill or drain your axle's oil.

expert reply by: Jerred H

0

Jerred H.

11/3/2025

Hey, how did the switch to the aluminum oil caps go on your Big Tex trailer? Your update could make it easier for the next person upgrading from the clear plastic caps.

Reply

Answer 1

My contact at Dexter Axle confirmed that Oil Cap Kit #RG04-270 is a correct replacement for the older part reference 21-36 which is now discontinued. Both oil caps have the same 4-inch diameter and are fully interchangeable. The only difference is…

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Answer 2

Hey Eric, so we do have what you need with the replacement cap part #VA55JR but the one you mentioned is smaller so it would not work for you. The cap you need is 4 inch diameter and the one you referenced is 3.75 inch.

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Answer 3

Dexter recommends a SAE 90, SAE 80W-90 or SAE 75W-90 oil to be used. I recommend the Kodiak Synthetic Bearing Oil for Oil Bath Hubs #XLPROLUBE as it is a synthetic 90 weight oil that helps reduce friction and to keep bearings cool. Since your cap was…

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Answer 4

It looks like you're likely trying to replace your hubs/drums on your Dexter axle and I do believe that the "0100" you found on the spec plate actually reads "D100" since that was one of the models that Dexter had for this…

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Answer 5

I spoke with my rep at Dexter axle and was informed your axle has a 3,500 lbs weight capacity, with a 58" spring center, and a 72" hub face. A comparable replacement is the Dexter Trailer Idler Axle Beam with EZ-Lube Spindles - 72"…

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Answer 6

Nowadays you would be able to find the axle capacity stamped on your axles, but that was not always the case. If you are unable to find that information on your axles, you still have other options. The first thing I would do is try to determine the…

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Answer 7

Hey William, thanks for reaching out! Yes, the Dexter Fortress Threaded Aluminum Oil Cap #DX27CR will work with 15K oil bath axles. If you have a specific axle in mind, let me know what it is and I'd be happy to reach out to Dexter if you're…

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Answer 8

Hello Steve, thanks for reaching out. The DeeMaxx Replacement Caliper #DE52WR would not be a suitable replacement for the discontinued TDE 46802 caliper. Based on my research the TDE 46802 is for 7K-8K axles and the #DE52WR is only rated up to 6K.…

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Answer 9

Hi Shane; sometimes the adapter module #HBA-CAM is needed to help the brakes function properly. However, before you go this route I would check out the brake controller. More often than not you need to switch to electric over hydraulic mode for the…

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Answer 10

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 11

To figure out the correct oil bath cap, you will need to know your axle's capacity or size of your hub bore. For a 3,500 lb hub or 1.98" hub bore you would use Kodiak XL ProLube Oil Bath Hub Body and Cap #XLPROLUBE1980, or for the kit you…

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Recommended Dexter Fortress Threaded Aluminum Oil Cap to Replace a Dexter 021-036-00 Cap

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