Replacement 3,500 lbs Spindle for a Square Tie-Down Axle

Question

Question:

I have a 2016 Venture boat trailer. I need a weld-on spindle. I need the brake flange also. Would like to know what you recommend? Attached pictures

asked by: Jeff L

0

Tie-Down
(click to enlarge)

Expert Reply:

Hey Jeff, thanks for the pictures! I found a break down of your axle online and yours is a a 3,500 lb axle, which uses a # 84 spindle compatible with a # L68149 inner and an # L44649 outer bearing. Pretty sure you need the #84 E-Z Lube Spindle item # TRU77FR but I would like you to take some measurements to confirm because I could not pull a part number.

The diagram I found matches up to the #84 E-Z Lube Spindle w/ Brake Flange item # TRU77FR. It has a 3" inner diameter and the Stub dimensions are 3-1/8" diameter x 1" long and an overall spindle length of 6-1/8".

I have linked a of diagram below that shows how wide the spindle is when it attaches to your Tie-down axle.

expert reply by: Jerred H

0

E-Z Lube Spindle
(click to enlarge)

Jerred H.

11/3/2025

Hey Jeff, were you able to confirm the measurements on your Venture trailer axle for that #84 E-Z Lube Spindle with brake flange? Knowing how it matched up could help others trying to replace the same setup. Your update could make it easier for the next person with a similar axle.

Answer 1

Hi Charles! That's an interesting idea, but the TruRyde #84 E-Z Lube Spindle w/ Brake Flange for 3,500-lb Trailer Axles #TRU77FR does need to be welded onto the axle beam. The 4 bolt holes/plate on this spindle (and all spindles for that matter)…

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Answer 2

In order to verify the spindle dimensions so that you can pick out the correct hub/drum you have to get exact dimensions. For that you need to use a digital caliper like part #PTW80157. For how old your trailer is this is especially important as the…

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Answer 3

Square axle capacities are pretty hard to determine. Unlike round axles, they do not have set capacities based on their dimensions. Based on the bearings your hub looks like it's rated for 3,500 lbs. Most likely that would be the same rating as…

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Answer 4

Yes, we do! For a 1-1/2" spindle you'll want the Square #84 Spindle for 3,500-lb Trailer Axles item #TRU47FR. This is designed for 3,500-lb trailer axles and measures 1-1/2" wide x 3-5/8" long. For a compatible 5 on 4-1/2 hub we…

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Answer 5

A true 1 inch spindle is a BT8 spindle, like #TRU94FR. The next closest one would be the BTR spindle which is commonly referred to as a 1-1/16 inch spindle, like #TRU44FR and is more common than the BT8. Both of these are typically used with 2,000 lb…

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Answer 6

Square axles can be tough to determine capacity. Often times the same spindle fits a range of axle capacities. The best way to determine the capacity is to get the inner and outer bearing numbers stamped into the metal of the bearings like you did.…

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Answer 7

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 8

Hey Bryan, that's a good question. The pricing can definitely be misleading, but I wouldn't use it to judge the quality of the tire. A lot of that comes down to promotions, inventory, and whether you're looking at a tire by itself or…

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Answer 9

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 10

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Answer 11

The #84 spindle is just a common way to identify the spindle dimensions typically used for 3,500 lb axles. So instead of listing out the parts, people can just say they have #84 spindles and it's easier to know what fits it. The CE Smith Trailer…

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Answer 12

It sounds like you are speaking of the wires for the brake magnets. If this is correct, you will need to connect one of the wires to the brake controller output wire on your trailer connector and the other wire will need to be grounded to a clean…

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Replacement 3,500 lbs Spindle for a Square Tie-Down Axle

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