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Random Quote: The longer I fish, The luckier I get!!
I have and am very happy. One of the best things I have done to my trailer. No more creaks and groans and no more rusting of springs and related hardware. Boat seems to take potholes a lot easier as well.
Its done all the time. I own a boat trailer company on the Gulf Coast and have been in the boat trailer industry for 34 years. I switched from spring axles to torsion around ten years ago and would never build another saltwater trailer with springs again. Not only will you not have to worry about springs, bolts, u-bolts and other hardware rusting, but you will notice better tire wear over time. A high quality torsion axle is less prone to losing its camber over time. If your trailer is aluminum, the install will be very easy. Who ever you buy the axles from will need to know frame width ( outside to outside of I beams) and track. Track is face of the the hub to face of the hub. They will also need to know the weight of the boat for the right capacity axle.
Kevin, right now it has 2 7000# UTG axles, which i can't find for sh!t to replace, i started noticing the heavier axles all with torsion setups, none specifically said marine. The trailer is galvanized the, boat is 8K in change depending on how much fuel is in it. Any recommendations on manufactures or retailers ? also would you recommend surge or electric brakes ? the trailer get dunked twice a year to put the boat in and pull it out.
You might try calling Tie Down Engineering to see if they can put you in touch with a dealer or mfg near you. You will need a pair of 6k axles with mounting plates to fit your frame. The dealer will also need to know what size tube or channel your frame is made of.
Tie Down Engineering (800)241-1806
On the brakes. I would go with the Kodiak disc brakes. Kodiak part # 2/RCM-12-SCAD and a Tie Down 12.5K brake coupler TD part # 48780C. The same dealer that supplies you with your torsion axles should be able to supply this brake setup.
The reason I use Tie Down torsion axles is mainly because of the removable spindle and forged brake flange. To be able to change a damaged spindle with out having to change the whole axle is great but it also allows the mfg to galvanize the torsion arm without the spindle. The Tie Down brake actuator has a aluminum master cylinder and is well designed.
Spare carrier that holds a quick change spindle and hub.
When you did the spring to torsion conversion, how did you account for the ride height difference? My trailer has springs and the traile rride height, bunks, and fenders are set for the spring height. Aren't torsion axels slightly lower? I'd like torsion axels too, but won't spend the time and money to modify this entire trailer, I'd just buy a new one.
Good question slapshot. When you convert from a spring axle to torsion you need to select a torsion arm angle to put the spindle back at the same distance from the frame in order to have the correct tire clearance from fender. This is not a problem even if you are trying to match a low drop style axle. Torsion axles can be made in 25,22.5,15 and 10 degrees (up) to lower a trailer and 0,10,22.5,25,35 and 45 degrees (down) to raise it.
Kevin said: "The Tie Down brake actuator has a aluminum master cylinder and is well designed."
I'd like to challenge you on that one Kevin!
We just pulled a three year old failed Tie Down acutator with the auuminum cylinder and replaced it with a Titan Dico.
Like all Tie Down stuff it was junk. JUNK!!!!!!
All of the internal steel rods were rusted to pieces and would not work at all.
All it did was sit outside in salt air. The trailer had about 1500 miles on it total. and was towed five times a year to a ramp 3 miles away and then five miles for boat fuel.
Junk! I say!!!
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Trailer axle replacement ? 
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