Over Under Kit for 3,500 lb Axle of Cherokee Grey Wolf MK22SE and Shock Kit

Question

Question:

Hello, I have a few questions and some ideas. I have 2021 Cherokee Grey Wolf 22MKSE with dual 3500lb axles. GVWR 7585. Stock 205/75R14 tires. I would like to flip my axles so they are below the spring packs to allow more clearance and for larger wheels and tires. An overslung axle is going to be stronger and more reliable because its not hanging from the u bolts right? Is Kit # K71-384-00 the right one? Ill need 2 sets. Also, would Sumo helper springs be helpful to cushion and dampen the ride? Higher load tires would provide more for peace of mind while on the rough, backcountry roads. I don’t want the ride so hard though that things rattle apart, would an E load be overkill? Looking at a LT235/75/R15 truck tire. Would need a recommendation on a 15inch wheel too, preferably black aluminum. Rv will be taking the 8,000+ mile round trip to AK this summer. Any other recommendations appreciated! Ready to hook it up!

asked by: Lou

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Expert Reply:

Since your trailer has 3,500 lb axles the correct over under kit is the part # K71-384-00 that you mentioned. An overslung axle will give you more ground clearance but does not give you additional capacity or is any stronger. The SumoSprings kit part # TSS-107-40 that you referenced will give you more support and fits your axles but does not cushion the ride quality at all.

To cushion the ride quality the best option would be a shock kit like the part # LC281255 which dampens the movement of the suspension and will do an excellent job improving the ride quality.

For the tire size of 235/70R15 on a black wheel we have the part # LH46FR which would work great.

expert reply by: Jameson C

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Answer 1

Yes, the Westlake ST235/75-15 Off-Road Tire with Liger wheel part #LH46FR would be an exact match for what you have on your Forest River No Boundaries 19.5 and would work great. Trailer tires are not balanced like vehicle tires are. It…

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Answer 2

The Westlake ST235/75R15 Radial Off-Road Trailer Tire - Load Range D item #WST54FR you referenced will fit the Aluminum Sendel Series T07 Black Machined Trailer Wheel item #AM97XR. This is a 15" x 6" rim with a 5 on 4-1/2 lug…

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Answer 3

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 4

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13…

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Answer 5

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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Answer 6

Your math is correct in your trailer weight load example. If a fully-loaded tandem axle trailer weighs 4000-lbs then each of the 4 tires will bear 1/4th of that load, or 1000-lbs. In this case a tire rated for 1300-lbs would provide a good safety…

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Answer 7

The three most common lug stud sizes for a trailer are 1/2"-20, 9/16"-18, and 5/8"-18. In order to make sure you get the correct lug nuts you need to measure the lug studs on the trailer now as we have no way to look this…

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Answer 8

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 9

To determine the size of the hub assembly you need to purchase you have to determine which bearings are in the old assembly. If the old assembly has L44649 inner bearings, you would use the hub you chose #8-258-5UC1. If the inner bearings are…

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Answer 10

To find the load capacity for your axle you should look on the trailer VIN plate or sticker that lists the VIN number. The weight rating of the axle should be listed on that same plate or sticker. Also, the axle could have a tag or plate on it that…

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