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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.
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Old 03-11-2019, 03:39 PM
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Oh yea, here are some pics.





















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
- 2016 F350 DRW Ultimate (stock for now )
- 1987 Buick Grand National (Staged)
- 2004 Mercury Marauder
- 1993 Geo Prizm (beater)
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Old 03-11-2019, 04:03 PM
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Dang Billy, that sucks.

As Zeb stated, Ive 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. Cant remember the name but they look like great quality. Although not cheap, Id 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
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The thread is on Ford truck Enthusiasts Forums, in the Excursion section, under Swapping 07 axles into an 01 Excursion.
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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
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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 thats the company. Dont 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 itd improve the ride even further.

Quote:
Originally Posted by Zeb View Post
Man, youve done the swapping!!
I often wondered why you had both setups under the same truck, now I know.
Billy, glad youre ok!
I dont 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 its ford trucks, Ill 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 hed totaled it last year. However hes swapping everything into another truck so itll live on!
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Old 03-12-2019, 05:53 PM
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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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  #11  
Old 03-13-2019, 07:23 PM
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How close to "stock" height is an '05 conversion? I was wondering if an '05 conversion would be close to stock height of a '96 f350? Billy, I hope you document your project if you do it.
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  #12  
Old 03-14-2019, 09:32 AM
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Quote:
Originally Posted by sootie View Post
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
Didnt they change the brakes from 13 on?

live life full throttle
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Old 03-14-2019, 09:55 AM
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Originally Posted by bluedge8 View Post
How close to "stock" height is an '05 conversion? I was wondering if an '05 conversion would be close to stock height of a '96 f350? Billy, I hope you document your project if you do it.


With the right coil spring and block setup it can be lower than a factory 4x4 obs f350.

Heres mine (bad picture but all I could find quick). 2 factory f250 rear blocks, 5200 lb coils, and 33 tires. Sat with the perfect amount of rake: front was 1 1/2 lower than the rear.

Sat 2 lower than a factory F350 4x4. It was perfect for me. Id even considered dropping to a 4400lb coil and pulling the rear blocks. Would have been 2wd height then, but would have had to run a 31 to 31.5 tire.

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Old 03-14-2019, 10:15 AM
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Quote:
Originally Posted by Strokersace View Post
With the right coil spring and block setup it can be lower than a factory 4x4 obs f350.

Heres mine (bad picture but all I could find quick). 2 factory f250 rear blocks, 5200 lb coils, and 33 tires. Sat with the perfect amount of rake: front was 1 1/2 lower than the rear.

Sat 2 lower than a factory F350 4x4. It was perfect for me. Id even considered dropping to a 4400lb coil and pulling the rear blocks. Would have been 2wd height then, but would have had to run a 31 to 31.5 tire.

Holy chit! I love it. My knees went to sh!t in the last 6 months, I just got my 2.25" PMF rsk with new v codes done last fall and the truck sits 4-6" higher than it used to. I was starting to think about selling just because it sucks to get into so bad. How does a guy find a donor frame with axles?

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Originally Posted by Arisley View Post
D3leted 6.0's are the best. D3lete them and replace with a Cummings.
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Old 03-14-2019, 10:31 AM
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Originally Posted by bluedge8 View Post
Holy chit! I love it. My knees went to sh!t in the last 6 months, I just got my 2.25" PMF rsk with new v codes done last fall and the truck sits 4-6" higher than it used to. I was starting to think about selling just because it sucks to get into so bad. How does a guy find a donor frame with axles?

Sent from my SM-N950U using Tapatalk


I was looking for the pictures of the same truck with the 2.25 rsk w/ v codes and 4 blocks in the back but I dont have any on my phone. With that setup I was easily able to clear 35s and thats what it had when I sold it.

The 33s in that picture above were very tight with the wheel offset and width of rim/tire. Had to be careful when turning and going through a dip or it would rub the fender. I switched to factory 2010 18 wheels with the same height tire and there were zero issues. Again sorry no pictures of it on my phone with those wheels.

Setup like the picture above and lower than a stock obs f350 it was very easy to get in and out of without steps. When I did the rsk, you almost had to jump in!

To find a wrecked truck is best but theyre available. I actually have the front frame section of a 2010 with the 4.10 geared axle out of my dually. I swapped the Dually to 3.73s. Just havent posted it for sale yet. If we lived closer together, Id trade you your front end for it as Im eyeballing getting an obs Dually and concerting it to a 4wd with rsk.
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Old 03-14-2019, 10:36 AM
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Didnt they change the brakes from 13 on?

live life full throttle
yep, they eliminated hydroboost on 13+ SRW trucks. Duallys still had hydroboost though. No dimensional changes that i'm aware of though.
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Old 03-14-2019, 10:38 AM
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yep, they eliminated hydroboost on 13+ SRW trucks. Duallys still had hydroboost though. No dimensional changes that i'm aware of though.
I thought the 13 front axle changed with a bigger knuckle that required a different caliper?

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  #18  
Old 03-14-2019, 10:39 AM
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Originally Posted by lincolnlocker View Post
I thought the 13 front axle changed with a bigger knuckle that required a different caliper?

live life full throttle
could be so. I'm not aware of any dimensional changes though...(as in, 17s still clear it so)
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Old 04-03-2019, 02:47 AM
Garbage_Mechanic Garbage_Mechanic is offline
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Dang is what I say as well. Your truck is one of my favorites and it is painful to see it bent! I can't help you with the decision to go coil or not. I do have a comment that this is the second or 3rd time I have seen similar frame issues on a truck with RSK. Either the front of the frame was designed dumb, or designed to be a crumple point but either way, the fron of the OBS frame rails was not designed for the torque load of the anchor of the front axle (front spring eye) The coil conversion fixes this, but I recently found a write up on doing the Super Duty front leafs while NOT doing an RSK and very little ride height increase. Kind of sorry I just finished my upgraded RSK when I discovered it....
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Old 04-03-2019, 02:49 AM
Garbage_Mechanic Garbage_Mechanic is offline
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Also, they frame may not be parallelogramed, the cab and front clip may have moved on the rubber mounts. Glad you are OK, and it is refreshing to concentrate on the fix and possible upgrade rather then spend 50 posts bitching about insurance companies etc...
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  #21  
Old 05-02-2019, 03:16 PM
blaze12340 blaze12340 is offline
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I used the RYD kit with coil over conversion I can help with picks and any help needed
I love the turn radius and the looks I get from people that realize the is supposed to have leaf springs
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