Spring Hanger Spacing Dimensions for a Tandem Axle Slipper Spring Suspension on a 14,0000 lb Trailer

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Question:

i would like to know the hanger spacing on 7 ton slip spring instalation thanks

asked by: Todd

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Expert Reply:

The hanger spacing for a tandem axle trailer suspension setup can be determined, but you need to take into account the axle spacing needed for the overall diameter of your wheel and tire combination and the springs you will be using.

Lets say that you plan on using 4 of the 5-Leaf Slipper Springs, # e74SR, for 7,000-lb Trailer Axles, and that your wheel and tire combinations are the Karrier ST235/85R16 Wheel and Tire, # AM32764.

The AM32764 wheel and tires overall diameter is 31.61 inches, so you will need your axles to be centered at least 33-1/2 inches apart and you might be better off going with 36 inches apart, so there is clearance for the suspension to work and the tires do not contact each other at the center between the axles.

Hanger spacing is also dependent on the center equalizer used in the slipper spring setup. The longer the center equalizer, the wider the axle spacing will be, causing a wider hanger spacing.

To get 33-1/2 inch axle centers, for two 7,000 lb axles using the 5-Leaf Slipper Springs, # e74SR, and the Tandem Axle Hanger Kit, # AP202-H202, the hanger spacing would be 28-3/4 inches between the front and center spring hangers and 28-3/4 inches between the center and rear spring hangers. This hanger kit uses # 13-4 equalizers.

To get 36 inch axle centers, for two 7,000 lb axles using the 5-Leaf Slipper Springs, # e74SR, and the Tandem Axle Hanger Kit, # AP216-H202, the hanger spacing would be 30-1/2 inches between the front and center spring hangers and 30-1/2 inches between the center and rear spring hangers. This hanger kit uses # 13-44 equalizers.

The equalizer you referenced, # 13-118-03, is for newer 8,000 and 9,000 lb axles. We carry it as a replacement part and it is not used in any of our hanger kits. If you were to use this equalizer with spring hangers designed for 2 inch slipper springs, you would need to mock up your suspension and determine the hanger spacing you will need. You will also need to make sure there would be clearance between the axle centers for your suspension to move with the wheels and tires you are using.

expert reply by: Robert G

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Answer 1

Many of the ball mounts we offer that we offer that fit 2 inch receivers like part #2753 which has a 2-3/4 inch rise or 4 inch drop, that are designed to be able to use in a rise or drop position by simply turning it upside down, without losing any…

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Answer 2

There isn't a pintle adapter for ball mount #C45902 rated for 21,000 pounds but I may have a solution for you. What you could do is use ball mount plate #337PM25812 with Convert-A-Ball pintle hook combo #PH1. When used as a pintle hitch the…

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Answer 3

Yes, you can use the Pintle Hook Mount, #63059, in either a rise or drop position. If you need a bolt on pintle hook, use #C48205. It has a 10,000 pound capacity so it has more than enough capacity for your trailer.

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Answer 4

The spring hanger placement is going to be determined by your axle spacing. For example, if your axles are spaced 33 inches apart, as shown in the attached diagram, a 7K axle slipper spring, like #e74SR, requires a distance of 28-1/2 inches between…

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Answer 5

Thank you for providing the specs for the suspension components that you already have. Correct hanger spacing really depends on the components being used such as springs, hangers and equalizers. Most of the hanger spacing dimensions that we have are…

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Answer 6

I was able to find more info on your slipper spring. Looks like you have a Dexter 5115 slipper spring that is 27-1/2 inches long and has a 4k capacity. I attached a picture that has all of the hanger spacing dimensions needed when installing this…

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Answer 7

The correct airbag kit for a 2000 Ford F-350 with B&W Gooseneck Hitch is the Air Lift LoadLifter 5000 Ultimate Air Helper Springs part #AL88390. The center bolt for the upper air bag bracket will actually go though the side plate for the…

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Answer 8

If you check out the install diagram I attached for the Firestone kit part #F2400 you'll see that it does not attach to a jounce bumper and instead attaches to the side of a frame rail and to the axle. Based on that this kit will fit a 2006 Ford…

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Answer 9

To replace the Atwood 82541 surge brake actuator on your 1985 Trail-Rite boat trailer with drum brakes I recommend the Titan Zinc-Plated Brake Actuator - Drum - Multi-Fit Ball - Bolt On - 7,000 lbs #T43397007K which will fit your 3" wide tongue…

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Answer 10

The Dexter Tandem-Axle Trailer Equalizer Kit for 2" Slipper Springs - 17-3/8" Long Equalizers #HAP-205-02 will work with your tandem 9,000 lb axles. It is designed to be used in conjunction with the Dexter Single-Axle Trailer Hanger Kit for…

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Answer 11

The B dimension on a slipper spring is the distance that should be between the hanger and the mounting point on a slipper spring equalizer. For example the part #e46SR that you referenced should have a distance of 24-7/8 inches between the first…

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Answer 12

If the U-bolts are 9/16 inch diameter, the torque specs should be between 65 to 95 foot lbs. If the U-bolts are 3/8 inch diameter, the torque should be between 30 and 50 foot lbs.

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Spring Hanger Spacing Dimensions for a Tandem Axle Slipper Spring Suspension on a 14,0000 lb Trailer

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