Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
This 4-leaf double-eye spring is 25-1/4" long x 1-3/4" wide. It is designed for use with 3,500-lb trailer axles.
Features:
Specs:
| Part Number | A | B | C |
|---|---|---|---|
| PR4B | 25-1/4" | 3" | 12-5/8" |
Leaf springs are an integral part of your trailer suspension system. The double-eye spring is suspended at the ends by hangers that attach to its eye or, in the case of tandem-axle or triple-axle systems, into hangers in the front and rear and an equalizer or equalizers in the center. To determine the type of hangers or hanger kit you need, you must know the specific type of leaf spring you have, as well as your axle diameter and capacity. Depending on the hanger kits used with them, springs can be configured to work for single-, tandem- or triple-axle applications.
Please Note: To ensure proper axle alignment and suspension performance, leaf springs should always be replaced in pairs.
Video of 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles
Videos are provided as a guide only. Refer to manufacturer
installation instructions and specs for complete information.
Today were going to show you how to install a typical leaf spring onto a trailer. What we have here is a typical 4 leaf spring on a 3500 pound axle. The first step involved is loosening this bolt here and this bolt here on the bottom and this top one we do not have to worry about for now. The next thing we have to do is loosen these U-bolts here. The nuts are on the bottom, so we loosen these out so we can get our axle away from the spring. What were going to do first is take off this bolt and then well come around and do this one. Were going to let this spring down and our axle is going to hang down a little bit. What we did was keep the axle tight on the other side so it will come down some but it will take off most of the weight so that way we can do one at a time.
If the bolt is jammed in there a few wacks on the hardened bolt will be okay but well put the nut back on to protect the threads a little bit more. With the spring away you might as well take a moment to inspect the shackle links here, this is a part that is supposed to wear down over time. What youll see is that this hole will become oval shaped as the weight sits on the trailer. This ones in pretty decent shape so we wont have to change it out, but if you see any hole egg shaped, its probably time to change it out. Now well re-install our spring bolts with a reversed procedure. What you want to do now is leave the outside spring bolts and mount our U-bolts into place. You want to leave this loose so you can have a little wiggle room. Since we have our bolts in place we can start tightening them down, well start with the U-bolts and well tighten them down equally. Basically well do a criss-cross pattern then back and forth. The main object here is to tighten these down equally, one or two threads difference is not going to make that big of a deal, but its what you want to aim for. Torque wise, you want to make sure the plate is bending up slightly, once youve done that then youre tight enough. Now we go back to our spring bolts and tighten those down. Now well repeat for the other side. There you have it, your spring install is complete.
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Average Customer Rating: 
4.8 out of 5 stars (29 Customer Reviews)
by: Donald Scheib04/20/2011
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worked great 12027
by: Doug02/05/2012
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Etrailer has it's online sales together. They let you know the progress of your order all of the way. The product was excellent. I would defiantly purchase again from them.31090
by: Dan G.01/23/2012
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worked like a charm. 30219
by: John A.12/13/2011
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Due to a snapped axle spring on my Outback travel trailer, I replaced all four springs and all shackles, bolts and equalizers. I really like the quality, rapid shipping and the fact everything came exactly as ordered! The only thing I would change is to order the greasable bolts for every pivot point rather than just the equalizer pivot. These higher load rated springs should have been on the camper from the factory! I'm a happy camper now!28058
by: Bob Y.11/21/2011
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Fast delivery 27257
by: Teresa S.11/08/2011
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parts fit perfect and very pleased with the quick shipping26707
by: Doug S- So Central PA10/26/2011
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Ordered springs, u-bolt kits, & shackles, equailizer, & wet bolts to rebuild my worn landscaping 7500 GVW trailer I use to haul my sub-compact tractor. All recieved in 2 working days. Good job guys.26141
by: PAUL R10/25/2011
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GOT JUST WHAT I ORDERED AND FAST, THANKS 26099
by: dave b10/11/2011
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speedy shipping! 25443
by: J.A.09/01/2011
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Spring was better than I expected. The biggest thing that directed me to purchase this spring from this company was all the very positive reviews I read before making my purchase. I also read some of the tech support questions from other customers, one question actually helped me in my selection of the spring I purchased. For sure I will use this company for any future trailer needs.23399
by: Don Bowman08/17/2011
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everything went great 22027
by: Jerry N08/13/2011
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The spring was an perfect match to the broken one and went on with ease. The service was great. Thank you21797
by: Soccer30306/25/2011
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I was looking for replacement leaf springs for trailer. Great site, easy to find what you what and excellent information about the items. Highly recommend. 17923
by: Pete S.06/07/2011
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I received the product in time and in excellent condition. The website was easy to understand which helped me find the right part. I will be looking forward to my next project. The old springs are likely from a carriage.16361
by: John C06/01/2011
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Everything seems to be as ordered and on time for delivery. Pleasure doing business with you.15866
by: Bob S.05/31/2011
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Parts were exactly as represented. Service of etrailer was very pleasant and fast. Liked the emails explaining the stages the order was in.15764
by: Jim Miller04/27/2011
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Installing the leaf spring was no problem. I may point out that a "C" clamp is very useful to line up the round bolt head in the spring center with the hole in the u bolt block! Avion trailer is now in service.............Thanks..........I am sorry, camera was not availiable...no picture12495
by: Randall R04/13/2011
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They are leaf springs so there is not much to say about them; however the order was correct, shipped in a timely manner, and the web site offered associate material needed to finish the job. The price was definitely reasonable compared to other company’s offering the same material.11677
by: Marcus V.04/07/2011
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Product was exactly what i ordered, and arrived in a timely fashion. Thanks for the great service, I will use Etrailer again for any of my trailer needs.11256
by: david f.04/05/2011
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every thing that i ordered i received and in great shape, the product was every thing that was stated. also reveived in a timely maner11171
by: Robert Clark03/29/2011
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Have not installed yet but the order was processed and delivered promptly and the parts look great.10608
by: Mark03/21/2011
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I received the parts very quickly and in excellent condition. I am a return customer because of this, and the great price.9925
by: Anthony03/06/2011
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Perfect fit and quick delivery 8607
by: RLB03/04/2011
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Great price and quality of parts. Delivery was very quick.8453
by: Lee C.03/01/2011
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springs came in as scheduled. Seem to be proper. Will not know too much until installed and tested on the road. Pleased with service and product at this time.8184
by: Bryan F.02/02/2011
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Great Product, Ultra Fast Shipping, Very caring of the Customer!! Will order again for all my trailer needs!!! Thanks Again!!!6549
by: SUNRISE MARINE01/17/2011
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PARTS GOOD5605
by: Scott R.01/17/2011
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Positive Experience I recommend etrailer. the price was better than I'd seen locally or online, although it happens that the size and type I needed was a particularly good deal. The service and shipping were surprisingly prompt, and when the box arrived, everything was as advertised. While replacing four leaf springs is about as much fun as shopping for socks, etrailer at least made ordering a positive experience. I actually found the video helpful as well. I've included a picture of what mine actually looked like. A breaker bar is a very handy tool.5603
by: Dave B02/10/2010
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As expected good quality Installed easily, I have not used for any length of time looks to be good quality.2707
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