Newbie questions
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5th Wheeling
Joined: Oct 2025
Posts: 44
Likes: 2
Newbie questions
First things first I’m new here so hi with that being said though I have some questions with the OBS’s as I’m a fan of them and plan to get one in the future
first 99-04 super duty axles are they just a direct bolt in springs and all? I saw a yoke adapter somewhere too (I know 05+ coil swaps exist I just prefer leaf springs I’m odd like that) also when swapping the rear axle with a 99-04 super duty what will I need exactly to make the rear disc brakes work properly? I’ve heard just as is is fine or I’ll need an adjustable brake valve or I need to swap in the super duty brake cylinder and servo (whatever it’s called) You’ll have to explain it to me like I’m 5 because I’m trying to understand this stuff lol
second has anyone been able to put a brush guard on an OBS that had its front bumper swapped with a super duty’s? (I.e 2017-2022 super duty’s)
first 99-04 super duty axles are they just a direct bolt in springs and all? I saw a yoke adapter somewhere too (I know 05+ coil swaps exist I just prefer leaf springs I’m odd like that) also when swapping the rear axle with a 99-04 super duty what will I need exactly to make the rear disc brakes work properly? I’ve heard just as is is fine or I’ll need an adjustable brake valve or I need to swap in the super duty brake cylinder and servo (whatever it’s called) You’ll have to explain it to me like I’m 5 because I’m trying to understand this stuff lol
second has anyone been able to put a brush guard on an OBS that had its front bumper swapped with a super duty’s? (I.e 2017-2022 super duty’s)
Lead Driver
Joined: Apr 2016
Posts: 7,222
Likes: 1,343
From: Bahstun
Front springs will bolt in if you get an RSK kit as the SD prings are longer
https://www.pmfsuspension.com/1992-9...-Kit_p_13.html
Rear springs should be fine.
Rims wont fit from OBS so factor that in.
Going hydro boost? Thats what SD usually have in them.
You will need the proprtioning valve for them to work well and then decide on keeping RABS or not.
Dont know about the bumper but others will chime in.
https://www.pmfsuspension.com/1992-9...-Kit_p_13.html
Rear springs should be fine.
Rims wont fit from OBS so factor that in.
Going hydro boost? Thats what SD usually have in them.
You will need the proprtioning valve for them to work well and then decide on keeping RABS or not.
Dont know about the bumper but others will chime in.
Thread Starter
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5th Wheeling
Joined: Oct 2025
Posts: 44
Likes: 2
Front springs will bolt in if you get an RSK kit as the SD prings are longer
https://www.pmfsuspension.com/1992-9...-Kit_p_13.html
Rear springs should be fine.
Rims wont fit from OBS so factor that in.
Going hydro boost? Thats what SD usually have in them.
You will need the proprtioning valve for them to work well and then decide on keeping RABS or not.
Dont know about the bumper but others will chime in.
https://www.pmfsuspension.com/1992-9...-Kit_p_13.html
Rear springs should be fine.
Rims wont fit from OBS so factor that in.
Going hydro boost? Thats what SD usually have in them.
You will need the proprtioning valve for them to work well and then decide on keeping RABS or not.
Dont know about the bumper but others will chime in.
should I also get a RSK for the rear? Considering I’ll need one for the front and that’ll lift it by a minimum of 2” (or if there’s some way to squeeze the front super duty springs in without an RSK which I doubt) or something else so it’s not just a squatted truck then lol
and yes hydro boost from a super duty maybe
Last edited by ArticTheWolf; Oct 30, 2025 at 01:15 PM.
Lead Driver
Joined: Apr 2016
Posts: 7,222
Likes: 1,343
From: Bahstun
Rear Abs aka RABS
95-2003 are all Sterling in the F250 and F350
Rear is already set with rear shackles.
The springs on OBS are shorter than SD ones so you cant squeeze them in.
There is no short cut on lifting. IMO get the springs you need to lift it properly.
95-2003 are all Sterling in the F250 and F350
Rear is already set with rear shackles.
The springs on OBS are shorter than SD ones so you cant squeeze them in.
There is no short cut on lifting. IMO get the springs you need to lift it properly.
Lead Driver
Joined: Apr 2016
Posts: 7,222
Likes: 1,343
From: Bahstun
Springs or blocks for the rear
there is no RSK availble for the rear since its already been done
A front shackle causes the axle to move forward and the spring to compress, which can feel harsher, while a rear shackle allows the axle to move backward, improving ride comfort and bump absorption. A front shackle is often found on stock vehicles and can improve the approach angle but results in a rougher ride, whereas moving the shackle to the rear is a popular modification (shackle reversal) for a smoother ride
there is no RSK availble for the rear since its already been done
A front shackle causes the axle to move forward and the spring to compress, which can feel harsher, while a rear shackle allows the axle to move backward, improving ride comfort and bump absorption. A front shackle is often found on stock vehicles and can improve the approach angle but results in a rougher ride, whereas moving the shackle to the rear is a popular modification (shackle reversal) for a smoother ride
Last edited by knottyrope; Oct 30, 2025 at 03:28 PM.
Lead Driver
Joined: Apr 2016
Posts: 7,222
Likes: 1,343
From: Bahstun
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5th Wheeling
Joined: Oct 2025
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oh ok i got you for some reason i was thinking a shackle reversal was FLIPPING the shackle upside down lmao but after reading what you said and looking at pictures i see what you mean basically making the front leaf spring mount which had the shackle and was the moving part while the rear was just a solid mount basically swapping them around making the rear the shackle holder and moving part while the front is the solid mount thanks so much for helping me understand that
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Logistics Pro
Joined: Mar 2007
Posts: 4,598
Likes: 843
From: knoxville, tn
Help me understand what you are working with.
you have a 2003 truck that has good engine and drive train but the body has some rust?
you do not have an OBS, but want to buy one and swap a bunch of super duty parts onto it?
why not fix the SD? Body parts are cheap compared to buying a truck then swapping a bunch of parts onto it.
If you had an OBS already that needed work then maybe in the right situation it would make sense. But I am not sure it does currently.
If I understand this correctly, then save yourself a ton of time and money and fix the super duty.
you have a 2003 truck that has good engine and drive train but the body has some rust?
you do not have an OBS, but want to buy one and swap a bunch of super duty parts onto it?
why not fix the SD? Body parts are cheap compared to buying a truck then swapping a bunch of parts onto it.
If you had an OBS already that needed work then maybe in the right situation it would make sense. But I am not sure it does currently.
If I understand this correctly, then save yourself a ton of time and money and fix the super duty.
Thread Starter
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5th Wheeling
Joined: Oct 2025
Posts: 44
Likes: 2
Help me understand what you are working with.
you have a 2003 truck that has good engine and drive train but the body has some rust?
you do not have an OBS, but want to buy one and swap a bunch of super duty parts onto it?
why not fix the SD? Body parts are cheap compared to buying a truck then swapping a bunch of parts onto it.
If you had an OBS already that needed work then maybe in the right situation it would make sense. But I am not sure it does currently.
If I understand this correctly, then save yourself a ton of time and money and fix the super duty.
you have a 2003 truck that has good engine and drive train but the body has some rust?
you do not have an OBS, but want to buy one and swap a bunch of super duty parts onto it?
why not fix the SD? Body parts are cheap compared to buying a truck then swapping a bunch of parts onto it.
If you had an OBS already that needed work then maybe in the right situation it would make sense. But I am not sure it does currently.
If I understand this correctly, then save yourself a ton of time and money and fix the super duty.
Last edited by ArticTheWolf; Nov 1, 2025 at 06:50 AM.
Logistics Pro
Joined: Mar 2007
Posts: 4,598
Likes: 843
From: knoxville, tn
Ok. That helps some. I am still not sure you will gain a lot. If you pick up an obs some of that stuff won’t help that much. All you gain with axles is rear disc brakes. Unless the OBS is 2wd then the juice really isn’t worth the squeeze just to swap 4wd axles.
lit is a tough spot to have parts and want to put them on something. Have you thought about doing something more fun? Like a dent side swap? That would be more fun and the parts would net a larger benefit for the truck.
lit is a tough spot to have parts and want to put them on something. Have you thought about doing something more fun? Like a dent side swap? That would be more fun and the parts would net a larger benefit for the truck.
Thread Starter
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5th Wheeling
Joined: Oct 2025
Posts: 44
Likes: 2
Ok. That helps some. I am still not sure you will gain a lot. If you pick up an obs some of that stuff won’t help that much. All you gain with axles is rear disc brakes. Unless the OBS is 2wd then the juice really isn’t worth the squeeze just to swap 4wd axles.
lit is a tough spot to have parts and want to put them on something. Have you thought about doing something more fun? Like a dent side swap? That would be more fun and the parts would net a larger benefit for the truck.
lit is a tough spot to have parts and want to put them on something. Have you thought about doing something more fun? Like a dent side swap? That would be more fun and the parts would net a larger benefit for the truck.
Last edited by ArticTheWolf; Nov 1, 2025 at 08:17 PM.
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