OBS Superduty Axle Swap - PowerStrokeNation : Ford Powerstroke Diesel Forum
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post #1 of 11 (permalink) Old 08-24-2019, 04:06 PM Thread Starter
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Join Date: Jul 2019
Location: Pagosa Springs Colorado
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OBS Superduty Axle Swap

After a very long time of gathering parts, I finally got my axle swap done. It's only been about 10 months since I purchased the axles, but I had to wait to unbury them from the snow to start the process. I began by cleaning them up and painting them, then finding rims and tires that suited me. After a large amount of deliberation I decided to attempt the swap without a RSK kit. Much to my surprise it worked out wonderfully. The axles I swapped in are a 3.73 vs the 4.10 I had. (I am hoping for better mileage on the highway.) The rear axle, although very time consuming due to not having much help or a lift, was pretty much straight forward. I did end up using the superduty springs which were setup for an oilfield rig so they are pretty stout. On the front I used the standard obs f250 springs but added a 2inch block to help level it, which allowed everything to fall right in place. For the brakes, I had to redo the ends of the lines at the union so I just fitted the right sizes vs having to adapt anything. The front brakes from the OBS actually bolted right on to the superduty axle so there was no need to adapt lines. I ended up fabbing a panhard bar which made a world of difference with the steering. To do so, I just used the pivot point bracket from the old ttb setup. It worked like a charm. All I have left is to adapt my front driveline for the correct ujoint size, and get an alignment. After it's all said and done, I'm damn sure feeling it... after all, I did it on a sloped driveway with Jack stands and bottle jacks.
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post #2 of 11 (permalink) Old 08-24-2019, 04:08 PM Thread Starter
coal chamber
 
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Here are some more pictures. Meanwhile I've got to figure out what to do with my old Alcoas....
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post #3 of 11 (permalink) Old 08-25-2019, 03:16 PM Thread Starter
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Re: OBS Superduty Axle Swap

Just realized my pictures turned out like crap.....
ll repost them here.




































Here is my panhard bar... used the rear bracket for the old ttb pivot point, then went to the back of the sway bar mount.

Still need to clean up the passenger side brake line a little bit.
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post #4 of 11 (permalink) Old 08-28-2019, 06:35 AM
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Cool! I wouldn’t mind getting rid of my ifs when it starts giving me trouble. Only thing that I woulda done differently (with what I’ve been told over the years) is don’t put a lift block in the front. Take that with a grain of salt because I could be full of crap but I’ve always thought it made sense
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post #5 of 11 (permalink) Old 08-28-2019, 01:04 PM
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Re: OBS Superduty Axle Swap

Yeah I would buy new front springs. 1) blocks on the front are a no no. Under heavy braking you can spit the block and pretty much have the axle fall out. 2) the spring rate for the ttb is super stuff compared to the f350 springs, so you can fix two problems with one stone and have a better riding truck.
Your other pics didnt show either.

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post #6 of 11 (permalink) Old 09-08-2019, 07:19 AM Thread Starter
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Quote:
Originally Posted by Sbluke55 View Post
Yeah I would buy new front springs. 1) blocks on the front are a no no. Under heavy braking you can spit the block and pretty much have the axle fall out. 2) the spring rate for the ttb is super stuff compared to the f350 springs, so you can fix two problems with one stone and have a better riding truck.
Your other pics didnt show either.
Yeah I would like to buy new springs eventually, but considering after all is said and done I'm in about $1500 my wife said it'll have to wait. That being said, I actually used the front blocks that came off of the old ttb but I get what you're saying about them. I did end up using it to haul the rv to the lake on labor day. Other than riding like a brick she did quite well! Very little squat in the rear and pulled down the road well.

<img>https://lh3.googleusercontent.com/wb8D9WbBV-oMd25MuRCenDfjOrMyN8xVmGVFxTeZ4nLODkDJvx-9tUR9SI-2Cq0i5acVzGIH2LVH_vtjt-cc09fRmRA_nxbmpIRnDsOZSxEG9hpx4Zj4FzRAxgXb0pLX89Si v-ofjHWlPNxB51olk6fsXFQEXZmBj2fMG65STwssFWhFI9WZPb1R dzXWxj_SZF7t5hZt3KxNQnhp2IsyuDt8w6-hr1lqgjYiDQO39N8i46TX2Pvr8KWIKkkqdAL0xTLAc_bh_TWxt UsWk-8L8tv7SOsxZZxQTFR_hzSWh0yQKYyp0Xkj0e6RPu7QEeYXex-n-JVWSfBqelN-VeEV8H7uJtWFXD2gUcTXUsH3yA2NeIOwVjhBkJ24O8TWrYrt7H 7KP-NumXz2_E6siWGpExWkoSI8se-UIz_4bvMo8lqUmU_OhXU1FDb3X3-SKo-Za4o7409mYWqWBzyvO-mkzvfhymFaZWIUGAzjyflfP1326SjgFA8NygeA40nySG3D7UdB F1cDbnmTlX5RUNr_FG9blGArWgU3qx0L_4DeMvNhQxu45iP4Mi 1WlQKt89z3lq3k83YpEjenHBKoYvMfoqhrjK3uQpQasKpl5U1Z Y4fq4a5aWQSKULMuxCRH6EVwQTsb2MFmLCKeG8Dcbmx-VCuVk1GW4FEEOCGVpxmMis1DSAvhheH6KOY=w1082-h528-no</img>
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post #7 of 11 (permalink) Old 09-13-2019, 08:25 PM Thread Starter
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Re: OBS Superduty Axle Swap

Man my posts just really do not like adding images.... let me fix my last.

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post #8 of 11 (permalink) Old 10-09-2019, 01:32 PM
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Re: OBS Superduty Axle Swap

What did you do brake wise. I put the 99 superduty front on mine with the rsk from pmf.. I have the rear just haven't gotten to that point yet. The brakes just don't seem right.
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post #9 of 11 (permalink) Old 11-01-2019, 01:24 AM
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Re: OBS Superduty Axle Swap

I AM PUTTING A 2002 FRAME UNDER A 94 obs
maybe not as easy?

but get the best setup efuel and disks
upgraded engine with all 2002 stuff
180 injectors
terminator
hydro boost
1991 5 speed zf 42
made new cab mounts..
will run air to air cooler also too
will repin out connectors for 2002 computer
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post #10 of 11 (permalink) Old 11-01-2019, 11:45 AM
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Re: OBS Superduty Axle Swap

Quote:
Originally Posted by RWOODY View Post
I AM PUTTING A 2002 FRAME UNDER A 94 obs
maybe not as easy?

but get the best setup efuel and disks
upgraded engine with all 2002 stuff
180 injectors
terminator
hydro boost
1991 5 speed zf 42
made new cab mounts..
will run air to air cooler also too
will repin out connectors for 2002 computer
If you go to the project log forum, there is a guy putting a 96 crew cab on a 2006 frame with a built 6.0. Lot of good info on mounting the body to the frame.

96 F250 CCSB 4x4, D60, 3.55, Auto, 6.0 trans cooler 3"-4" down pipe & exhaust, not enough power
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