Where are Trailer Suspension Shackles Measured

Question

Question:

When Im measuring my shackles and equalizer am I measuring end to end or center of each hole? Thank you.

asked by: Charles A

0

Expert Reply:

Hey Charles, when measuring your trailer suspension shackles you need to measure from hole center to hole center. Let me know what you have and I'll help you pick out what you need. The part # AP233 has shackles which are 2-1/4 inches long which is pretty common.

expert reply by: Jameson C

0

Jameson C.

9/2/2025

Hey Charles, did measuring from hole center to hole center help you find the right shackles for your trailer? I'm asking because it could help others who are figuring out their trailer suspension needs.

Answer 1

Hanger height and spacing, spring length, shackle length and equalizer size are all variables in a trailer suspension and it is possible that the same length springs can fit in more than one application. The dimensions on the included charts are just…

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Answer 2

Suspension bolts are not designed to be torqued down tightly as this prevents the suspension from being able to move like it needs to be able to do. So the included solution with the kit part #AP233 is the lock nuts of the kit. The nuts have nylock…

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Answer 3

In regards to trailer suspension kits like the Suspension Kit for Tandem-Axle Trailers part #AP233, the shackle bolt heads are indeed seating into the hangers via the knurling on the bolt. If you hold a wrench on the bolt head and tighten the nut,…

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Answer 4

Yes, I would recommend keeping the bolts of the #AP233 lubricated. An easy way to do this is to use wet bolts like part #126B2 which have a zerk fitting that allows for easy application of grease to them.

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Answer 5

The Tandem-Axle Equalizer Kit, #AP233, will work as long as all other measurements are the same. Check that your shackle straps are 2-1/4 inches from center hole to center hole. The 5-3/4 inch long equalizer, #TREQ104, we carry is a direct…

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Answer 6

You may be able to reuse the same shackle bolts provided that they are the correct size, are not severely rusted, and are not cracked or otherwise damaged, but not the lock nuts. If you think your bolts might be rusted, cracked, or damaged I would…

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Answer 7

Hi Paul, you’re definitely on the right track here, and I can help you narrow this down with confidence. With your tandem 3,500 lb Dexter axles and 33 inch spacing, both the Dexter EZ Flex part #K71-652-00 and the Lippert Road Armor part #LC53CK are…

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Answer 8

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 9

You can use leaf springs that are rated higher than the axle without any issues as long as they measure the correct measurement for your trailer. For example the 6-leaf double eye spring for 7,000 lb axles part #e64SR measures 24-7/8" eye to…

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Answer 10

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 11

Hey Ian, great to hear from you again! The differences between the MORryde CRE3000 #MR87ZR and AllTrek 4000 #MR89DR that fit a 33" wheelbase is the height between the hanger and equalizer bolts, and the amount of travel the suspension style will…

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Answer 12

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Where are Trailer Suspension Shackles Measured

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