I found a good set of instructions for building/replacing the rock panels on my Tracker here in the DIY, wrote by Jimiweld. Instructions very close and very helpful when cutting into still straight body panels. Good tips to, I hadn't used 1/16 cutting wheels on angle grinder before, I have used lots of them since.
I have added my photos to the various steps in Jimiweld's instructions and my remarks are in bold italics. (Hope this doesn't cause any problems)
Re: Replacing Sidekick rockers question
« Reply #8 on: July 27, 2007, 04:32:49 AM »
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Making the Tube Rockers
Step 1
Measure the length of the rocker to replace, at this point make them a bit longer to allow for cutting and fitting later on.
Step 2
Either weld two pieces of 2"x 2" square tube with a 1/8" wall thickness together as shown or purchase 2" x 4" tubing with a at least a 1/8" wall thickness. I think the two pieces welded together is a bit stronger as it has the center web in it but realistically either will be strong enough. (I went with 2X4X1/8)
I used 2X4X1/8" Step 3
At this point if you are thinking about running big tires and are going to need to do any trimming to the fenders or front floor area to clear the tires I would suggest getting that done and have the tires fitting how you like them before putting the rockers in.
From the bottom of the door measure down about ½" to 5/8" and scribe a line approximately parallel to the bottom of the door on the existing rocker and across onto the front fender and rear fender area of the body. Have a friend hold a long aluminum drywall ruler for you and you can stand back and adjust it as needed until your happy. It"s flexible enough to match the body as well to keep a straight line.
I cut at the bend line below the door. take the front fenders of first and cut separately.Step 4
I used a 1/16 cutting disc on an angle grinder to cut out the old rocker. I just followed the line and cut it off. I cut the front fender and rear fender portion out at the same time. On the backside or under the truck I came down a good 1" or so and cut across the rocker. Just be sure not to let the grinder go in too deep on the drivers side, there"s a bunch of wires that run through that rocker.
Cut just inside pinch seam on bottom of rock panel, for 2X4 rails. On my first one, I cut to far inboard and had to add some metal to make it fit.Step 5
Fitting the new rocker isn"t too hard. Push the new rocker into the area that was just cut out, let it come to rest on the inside rocker that was left 1" long (the underside of the truck) as shown, this will give you a pretty good lap joint to weld to. Fit it in there and hold it in place with a couple jack stands or something. Mark the overall length once you have it positioned how you like it, take it out and cut it to size then refit. Now you can take the front fender off to allow for welding since the rocker is already fit. I flattened out the bottoms of my front fender a bit and let the rear portion sit out a bit more and tapered it in to the front, I kind of like how it looks like that.
I tack welded it front, back and middle on the outside and then the same on the underside or backside so that it wouldn"t twist while welding. You can weld it like this or you can put in the additional 1/8" thick material that I used. I have a vertical band saw so it was easy to cut the material to fit. I like the 1/8 material as the rocker area to weld to is thin and mine was still slightly rotted that makes it easy to blow holes while welding to the raw edge. I found that the 1/8" flat bar made it strong and easy to weld. Now you are performing an edge joint (no raw edge) where it is welded to the existing rocker material and the visible area is easy to weld since it is 1/8" material to 1/8" thick material and if done nicely no grinding is required where visible. Where I tig welded it you could easily mig weld it as well, I just tig welded as I could fuse the material together and not have to grind later.
Make sure you put lots of tack welds all over before welding, also clean all rust and paint away from the areas to be welded, it will weld much nicer. It"s always a good idea to stagger your welding (weld 2 – 4" long beads and then move to another area). This will help to reduce overall distortion. Allow the welds to cool between beads on the drivers side, don"t forget those wires are in there and you don"t want to melt them by overheating the material
I had wires on both sides, used duct tape to hold them up out of the way. Still be cautious with the heat.Step 6
Make end caps for the tubes and weld them on.
I think that"s about it.
* Rocker Sketch.JPG (23.47 KB, 958x612 - viewed 31 times.)
* Tube Sketch.JPG (17.11 KB, 958x612 - viewed 18 times.)
I tapered the front of the rails to match the wheel opening, same with the back. Then I cut off bottom of fender an added a tab bending inward so I could bolt the front fender on for easy removal. I welded a bolt up from inside the rails, but drilling an using a self tapping bolt would work. These work!!! First time out I was sliding over roots & rocks. Had a couple drops onto rocks, and just scraped paint off the bottom. Satisfaction every time I drop onto something.
It took a couple of days, but it was just the start of modifications.Almost finished product