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Old 03-11-2019, 03:20 PM
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Default RSK w/ SD springs vs +'05 coil springs

So this a$$hole decides to make a U-turn in front of me at the last minute. Well, it didn't pan out for him too well. He had to extricate out and sustained a possible broken leg. Anyway, the front passenger frame horn was bent along with the front RSK crossbar. Plus, the frame was parallelogram'd slightly.

My friend told me to do the '05 coil spring swap since I have to do some work. I have no complaints how my truck rides. I think it rides pretty good.

Anyway, has anyone gone from a RSK with SD springs to a +'05 coil sprung front? The rear uses the same springs.

Billy T.
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'97 Black F250HD SC, 3.55s, Punisher Trans, PI Converter, Dana 60 RSK w/ V & C SD springs, PIS 175/80s, T500, Cale's tunes, 910s, Smith Bros, ARPs, Fluidampr, IC, E-Fuel, 3" Plenums, CJC Traction blocks, HFHV IDM, T4/BASB, Horton, 268K
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  #2  
Old 03-11-2019, 03:36 PM
Zeb Zeb is offline
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I’m pretty sure strokersace has had an 05 setup and RSK on the same OBS.
  #3  
Old 03-11-2019, 03:39 PM
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Oh yea, here are some pics.





















Billy T.
gnxtc2@aol.com
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'97 Black F250HD SC, 3.55s, Punisher Trans, PI Converter, Dana 60 RSK w/ V & C SD springs, PIS 175/80s, T500, Cale's tunes, 910s, Smith Bros, ARPs, Fluidampr, IC, E-Fuel, 3" Plenums, CJC Traction blocks, HFHV IDM, T4/BASB, Horton, 268K
- 2016 F350 DRW Ultimate (stock for now )
- 1987 Buick Grand National (Staged)
- 2004 Mercury Marauder
- 1993 Geo Prizm (beater)
  #4  
Old 03-11-2019, 04:03 PM
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Strokersace Strokersace is offline
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Dang Billy, that sucks.

As Zeb stated, Iíve had both setups on the same obs. Only I did the 05 coil spring 1st, then switched to an Rsk with 04 axles before I sold it. I only did the swap at the end of my ownership because the 05 suspension (front and rear) went into an 04 I bought to replace it, so the 04 donated its axles back to the obs.

No comparison that the 05 coil front was a better ride of the 2. Ran SD b-code rear springs on both setups, with a 2Ē block on the 05 setup and 4Ē clock with the rsk. Ran 5200lb coils with the 05 setup and V-code leafs with the rsk. Truck sat considerably lower with the coil spring setup which I liked much better for pulling my trailers.

I was actually in a similar accident with my truck when it had the 05 axles in it and outside of the body damage and having to get the frame horn straightened, the suspension was not affected at all.

The downside to doing an 05 setup as compared to getting your rsk setup fixed is having to run new rims all the way around and at the minimum spacers on the rear to cover from 8x6.5 to 8x170. Or swap rear axles too. Also because the frame is narrower on the front of an obs compared to the SD, the coil springs ďleanĒ inward some. Also the radius arms angle out slightly from the frame to the axle. However, I never had an issue at all with binding or articulation. I think there is a company out there now that builds radius arm and coil spring brackets to compensate for this when installing on an obs. Canít remember the name but they look like great quality. Although not cheap, Iíd consider using them if I did the swap again.
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Old 03-11-2019, 04:23 PM
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Quote:
Originally Posted by Strokersace View Post
Dang Billy, that sucks.

I think there is a company out there now that builds radius arm and coil spring brackets to compensate for this when installing on an obs. Can’t remember the name but they look like great quality. Although not cheap, I’d consider using them if I did the swap again.
Thanks

Here is the company that I was thinking of using if I do the coil spring swap. https://www.rydmotorsports.com/colle...conversion-kit

Someone already wants my current axles.

And yes, if I do the swap, it'll have the same axles as I will get rear discs. I already know someone that has rims for a +05 swap.

Which axles are better, the 05-07 or the 08-10? I heard the 08-10 have bigger brakes?

Billy T.
gnxtc2@aol.com
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'97 Black F250HD SC, 3.55s, Punisher Trans, PI Converter, Dana 60 RSK w/ V & C SD springs, PIS 175/80s, T500, Cale's tunes, 910s, Smith Bros, ARPs, Fluidampr, IC, E-Fuel, 3" Plenums, CJC Traction blocks, HFHV IDM, T4/BASB, Horton, 268K
- 2016 F350 DRW Ultimate (stock for now )
- 1987 Buick Grand National (Staged)
- 2004 Mercury Marauder
- 1993 Geo Prizm (beater)

Last edited by gnxtc2; 03-11-2019 at 04:26 PM.
  #6  
Old 03-11-2019, 04:48 PM
Zeb Zeb is offline
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Quote:
Originally Posted by Strokersace View Post
Billy, that sucks.

As Zeb stated, I’ve had both setups on the same obs. Only I did the 05 coil spring 1st, then switched to an Rsk with 04 axles before I sold it. I only did the swap at the end of my ownership because the 05 suspension (front and rear) went into an 04 I bought to replace it, so the 04 donated its axles back to the obs.

No comparison that the 05 coil front was a better ride of the 2. Ran SD b-code rear springs on both setups, with a 2” block on the 05 setup and 4” clock with the rsk. Ran 5200lb coils with the 05 setup and V-code leafs with the rsk. Truck sat considerably lower with the coil spring setup which I liked much better for pulling my trailers.

I was actually in a similar accident with my truck when it had the 05 axles in it and outside of the body damage and having to get the frame horn straightened, the suspension was not affected at all.

The downside to doing an 05 setup as compared to getting your rsk setup fixed is having to run new rims all the way around and at the minimum spacers on the rear to cover from 8x6.5 to 8x170. Or swap rear axles too. Also because the frame is narrower on the front of an obs compared to the SD, the coil springs “lean” inward some. Also the radius arms angle out slightly from the frame to the axle. However, I never had an issue at all with binding or articulation. I think there is a company out there now that builds radius arm and coil spring brackets to compensate for this when installing on an obs. Can’t remember the name but they look like great quality. Although not cheap, I’d consider using them if I did the swap again.
Man, you’ve done the swapping!!
I often wondered why you had both setups under the same truck, now I know.
Billy, glad you’re ok!
I don’t think there is much/any difference in 05-07 axles, versus 08-10.
There is a really in-depth thread on another forum (I believe it’s ford trucks, I’ll look and see) that discusses the differences on some of the brackets, etc between 05-07 and 08-10.

Last edited by Zeb; 03-11-2019 at 04:50 PM.
  #7  
Old 03-11-2019, 04:54 PM
Zeb Zeb is offline
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The thread is on Ford truck Enthusiasts Forums, in the Excursion section, under Swapping 07 axles into an 01 Excursion.
  #8  
Old 03-11-2019, 07:16 PM
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Rear axles are the same 05-10. Front axle in 08 has the sway bar end links rotated 90 degrees.

11+ have bigger brakes and lack the tone ring to read speed in the rear.


Sucks to see such a clean obs get tore up
  #9  
Old 03-11-2019, 08:18 PM
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Quote:
Originally Posted by gnxtc2 View Post
Thanks

Here is the company that I was thinking of using if I do the coil spring swap. https://www.rydmotorsports.com/colle...conversion-kit

Someone already wants my current axles.

And yes, if I do the swap, it'll have the same axles as I will get rear discs. I already know someone that has rims for a +05 swap.

Which axles are better, the 05-07 or the 08-10? I heard the 08-10 have bigger brakes?

Billy T.
gnxtc2@aol.com

Yes thatís the company. Donít like the brodozer looking obs trucks in the pictures but parts look decent.

When I 1st did it, I was able to sell the axles and wheels for more than I had into the 05+ parts. I used all stock brackets. It was more hassle to get them off the 07 frame than it was to install on the obs!

Sootie is spot on below about the axle differences.

One thing I would love to try is to put the longer 08+ rear leaf springs on. I can only assume itíd improve the ride even further.

Quote:
Originally Posted by Zeb View Post
Man, youíve done the swapping!!
I often wondered why you had both setups under the same truck, now I know.
Billy, glad youíre ok!
I donít think there is much/any difference in 05-07 axles, versus 08-10.
There is a really in-depth thread on another forum (I believe itís ford trucks, Iíll look and see) that discusses the differences on some of the brackets, etc between 05-07 and 08-10.

Yeah I got pretty good at swapping stuff on that truck. Had it for 14 years and it went through a lot of transformation. It started life as a 460 and converted it to a psd using everything from an exact optioned, same year truck that is wrecked. Multiple injector, oil, fuel, turbo combos; 3 swapped engines; and 4 different suspension setups during that timeframe. Sold it 2 years ago and just last week called the kid to try and buy it back, but found out heíd totaled it last year. However heís swapping everything into another truck so itíll live on!
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  #10  
Old 03-12-2019, 05:53 PM
JCart JCart is offline
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Dang Billy, sorry to see one of my fav OBSs pranged, food that you’re ok though. Fawk.... the guys a dick and shoulda been throat punched to go with his broken leg, is what comes to mind. Yeesh.

RYD is close to me (relatively) I’m 300 miles inland from Vancouver. Not noticed any of their stuff up my way, but the web pix look pretty robust and not dorky. If you like I can ask a couple buddies of mine to see what the skinny is...
j
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