Axle over/under Kits

[spartyon8]

Has anyone used an over/under axle conversion kit before? I need about 1-2" of clearance in the wheel well and this seems like it would get me that. 

[airshot]

Tow vehicle or boat trailer ?

[Way2slow]

If you are talking about the trailer, I would move just mover the fenders.  If on the vehicle, over slinging the axle tends to make them a lot more wishy washy going down the road.  If on the rear, it can change driveshaft angles and possibly length as well as shocks and sway bar. 

You can always do like I've seen a lot of kids do to put wider tires on to get fender clearance.  Just put air shocks on and pump them up and let them beat you guts out while driving down the road.  

If you are talking about the trailer.

Do you currently have a drop axle or straight axle.  Converting from a drop axle to a straight axle will raise the frame approximately 2-1/2" depending on the amount of offset it has.

If you have an under slung axle (axle below the springs) if you move it to above the springs that's going to make the frame sit lower and probably make the finders rub and It will also give it less spring travel before it bottoms out. 

If you have and over slung axle (axle above the springs) and you under slung it, it will raise the frame the trailer several inches, depending on axle thickness and spring stack height.  On most V-hull bass boats, this can cause problems loading the boat.

As for converting from under/over slung to the other, it's usually just a matter of unbolting the axle from the springs, move it to where you want in and flip the U-Bolts and plate over.

To answer your question directly, I have never seen or used a "Kit", unless you are talking about removing a drop axle and installing a straight axle.  Most V-Hull bass boat have a drop axle along with a V-shaped frame so they can get the hull closer to the water for loading and unloading, not sure I would want to change that., 

[spartyon8]

It's for an 18.5' G3 Angler. The tires are rubbing the inside of the plastic fenders and burning/melting holes in them. I cannot raise the fenders as they would then contact the side of the boat. My first thought were the springs being shot but maybe they make a taller spring for trailers?

[Way2slow]

Different weight springs have different stack heights.  Might find a cure here.  Trailer Leaf Springs | etrailer.com

 

On a light duty trailer like that, another option you might want to look at is to use some 1/8" thick wall 1-1/2" or 2" high (get it a width that fits between the bolts) box steel and make you a couple of spacers to go between the spring and axle (if it's under slug with axle under spring).  If it happens to use U-Bolts and not plates, you can make longer U-Bolts with some all-thread.