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How to Determine the Correct Over-Under Conversion Kit

Question:

I have a 1982 Jayco Featherlite 4 tent trailer. How do I know if I can use the 2 3/8 or 3 inch kit on my axle? My other question is my tire size is 5.70x8 with four lugs. If i can use this kit I would like to use taller tires. I can’t go wider because there is no room on the inside of the wheel well. Do you have a tire/rim combo that would work? Thanks

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Expert Reply:

In order to determine whether you need the Dexter Trailer Springs Over-Under Conversion Kit # K71-384-00 (2-3/8") or # K71-385-00 (3") you will need to measure the diameter of your axle. You can do that with a set of Digital Calipers # 301-17068. If you get 2-3/8" then you need # K71-384-00 and if you get 3" then you need # K71-385-00.

As far as tires/rims are concerned you will want to ensure you have a 4 on 4 bolt pattern (which is the most common 4 bolt pattern) I have included a link to an article that can help you with determining this. You mentioned not being able to go wider than the 5.8" width your current 5.70 x 8 tires have. I have listed a couple options below that are taller tires but are not wider.

The Kenda 5.30-12 Bias Trailer Tire with 12" Galvanized Wheel # AM30790 would be 5.6" wide

The Kenda Karrier S-Trail ST145/R12 Radial Tire w/ 12" White Spoke Wheel # AM35351DX would be 5.7" wide

You would also want to ensure that you have a high enough weight rating and height available for the taller tires. The height will be easier to determine once you flip the axle and see how much height you gain. We currently do not have any 10" tires that are narrow enough for your wheel wells.

expert reply by:
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Scott S

Question:

I measured my axle and it 1.788 in. Do you make a kit for this size axle?

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Expert Reply:

I do have an option for you but there is not an over-under kit for a 1-3/4" diameter axle, but I would be happy to piece one together for you. You will need to following components:

Spring Seat # TRSS175 (you will need 2 of these), and U-Bolt Kit # APUBR-10. The spring seats will need to be welded to the top of your axle by a qualified welder.

expert reply by:
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Scott S

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