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I know I'm gonna have to drill my shackles to accept the bigger bolts in each end.
I've already changed over to the shackle reversal setup.
By measuring, looks like the tie-bolt may be set BACK farther
Which would move the axle back too far.
Any thoughts ?
I'm no expert but been looking into this too. I think people get the '05 up SD springs and I am almost sure they push the front shackle forward. Some don't like that they have to shim out the bumper to make it work. Just what I can remember but hopefully it leads you in the right direction.
Sky sells an offset deal to adj the centerline issue .
Is your rsk for sd springs? The ones I have seen are built to accept sd springs but I'm not sure whatis different from normal honestly.gabe did it but I didn't compare his and mine side by side.I should I guess.
Wish I was more help!
I'm no expert but been looking into this too. I think people get the '05 up SD springs and I am almost sure they push the front shackle forward. Some don't like that they have to shim out the bumper to make it work. Just what I can remember but hopefully it leads you in the right direction.
I bought OBS Skyjacker 6" frt springs & ther 2.5" shorter than stock.
They pulled the rear (RSK) shackles way forward.
Now the weight of truck is pushing upward on shackles & won't let the arched springs lengthen when suspension is trying to compress.
It's as rigid as the stock springs setup when they hinged up frt b4 the RSK install.
I'm goin to install 99-04 6" lift superduty 3.5" LONGER springs 2mro so the shackles (RSK) will be leaned rearward.
This way : the weight of truck should help lengthen the spring when compressing.
I'm goin to use SKY axle relocation plates to move axle forward because of longer superduty springs.
I don't wanna move my brkts and/or move frt bumper out :-(
The 99-04 sprints are longer on the front side to the axle placement. On factory springs it makes a huge difference because they are relatively flat. So you have to mount the front of the springs forward to keep the axle centered in the wheel well.
By using 99-04 lift springs that I'm assuming have much more arch, I'm wondering if your axle may look more centered because the high arch of the springs basically pulls the axle forward? Based on your observations of how the shackle sits with factory 96 springs I wonder if the 99-04 lift springs will be OK.
At this point I'd bolt them in even if I used undersized bolts just to see how it looks. I'm thinking worst case you will need to move the RSK bracket at the front. Or get a new RSK setup for superduty springs so you don't have to mess with the bumper a lot.
If you do not want to move or cut your bumper, Ditch the SKY stuff and get a Precision Metal Fab RSK. No cutting, welding or drilling necessary with their product
The 99-04 sprints are longer on the front side to the axle placement.
In this pic is the OBS spring still bolted at the rear along with a PMF RSK bracket showing the SD spring mounting location about a 2x4's width farther forward.
In this pic is the OBS spring still bolted at the rear along with a PMF RSK bracket showing the SD spring mounting location about a 2x4's width farther forward.
Yes Sir
I'm having my front springs tie bolt hole re-drilled forward 2.5" in these SuperDuty springs, to center the axle n fender well because I'm using the stock OBS frt mounting location to have CORRECT rear shackle angle :
This photo of pass side frt has longer 99-94 SuperDuty spring.
The far side (drivers) still has 92-97 OBS Springs which is 3.5"
Inches shorter eye to eye length.
BOTH springs are 6" lift.
It's AMAZING how much softer the passenger side suspension IS with the Shackle angled rearwards so the truck Weight can HELP lengthen the spring as it has to get longer to compress.
I'm so excited I learned this after my 30yrs of lifting 4wd trucks.
I've never given it any thought.
The OEM stock 2 leaf springs had the rear shackles strait up & down.
While I agree with the shackle angle having an affect on the ride.
But it reads like your test drive was with the SD on the passenger side and the OBS spring of the drivers?
I took this pic to show the shackle length but it shows the angle of my rear shackle. The U code springs a near perfectly flat, so my shackles actually pivot forward as the axle compresses and bends the leafs from flat to a frown.
...
But it reads like your test drive was with the SD on the passenger side and the OBS spring of the drivers? ...
No, I hadn't driven it yet.
I was only bouncing on each front corner to compare.
I Couldnt mk the drivers side shackle even move but the pass side shackle would flex backwards very easily.
I couldn't believe it made that much difference & will be better I'm sure when I get drivers side swapped out properly.
I always wondered why the rear of truck compressed so much more easier with stiffer springs than the front did.
Goes to show your never to old to learn new tricks.
I kept my RSK for 96 OBS from ORU.
Drilled front hanger to 23/32" (18mm)
Drilled rear shackles to 5/8"
Had 6" lift 99-04 superduty springs tie bolts redrilled & moved 2.5"
Forward & installed - tire is perfectly centered in fender well & rear shackle has correct angle leaning rearward.
Suspension seams Softer & less rigid.
I'm getn excited as I'm finishing this upgrade.
08-10-2013, 04:07 PM
