87 srw to dually
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Tuned
Joined: Nov 2009
Posts: 392
Likes: 2
87 srw to dually
Hi all. I have an 87 f250 460 4x4. I’ve toyed with making it a dually for quite some time. Now I think I have a pinion seal leaking so this may be the time to actually do the swap. I’m just looking to get some facts straight before I start spending any money.
from my understanding I can just swap in the dually axle and go. Is this true? And what years will work? I’d assume at least 87-91 if not up to 97.
Does anything have to happen to the drive shaft or is it good to go?
also I’m seeing more axles that have 4.10 ratios than 3.55. Well being 4x4 I’d like to stay with 3.55. Will the gears swap from one axle to the other so I don’t have to spend even more money on gears? If not then I may just fix the axle I have. Buttt I’d really like the dually and one ton springs.
from my understanding I can just swap in the dually axle and go. Is this true? And what years will work? I’d assume at least 87-91 if not up to 97.
Does anything have to happen to the drive shaft or is it good to go?
also I’m seeing more axles that have 4.10 ratios than 3.55. Well being 4x4 I’d like to stay with 3.55. Will the gears swap from one axle to the other so I don’t have to spend even more money on gears? If not then I may just fix the axle I have. Buttt I’d really like the dually and one ton springs.
FTE Legend
Joined: Jun 2006
Posts: 31,930
Likes: 1,499
From: Ottawa, Ontario
The dually axle must come from a pickup not a cab n chassis or a van(uses Dana axles), because in both cases the axles are different widths, the pumpkin has different offset, and the spring perches are in different places. A dually pickup axle will be a Ford 10.25 just like you have now so the diff can swap over if necessary, and you can use an axle from any OBS pickup from '97 back. You could also use an axle from a pickup older than your truck but it may not have the RABS sensor on the top of the diff and there is no guarantee the driveshaft attachment will be the same.. the flange may be different or there may be no flange at all. Most times this can be dealt with by swapping parts but keep an eye out for these things when you are shopping.
Thread Starter
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Tuned
Joined: Nov 2009
Posts: 392
Likes: 2
The dually axle must come from a pickup not a cab n chassis or a van(uses Dana axles), because in both cases the axles are different widths, the pumpkin has different offset, and the spring perches are in different places. A dually pickup axle will be a Ford 10.25 just like you have now so the diff can swap over if necessary, and you can use an axle from any OBS pickup from '97 back. You could also use an axle from a pickup older than your truck but it may not have the RABS sensor on the top of the diff and there is no guarantee the driveshaft attachment will be the same.. the flange may be different or there may be no flange at all. Most times this can be dealt with by swapping parts but keep an eye out for these things when you are shopping.
thank you. I should have added I understood about the difference between pick up/ cab chassis but still good info. I didn’t even think about vans but since they won’t work I’ll steer clear. I’m not worried about the sensor as my rabs is bypassed anyway. I will try to stay as similar year as possible just for hopefully ease of instillation.
also isn’t there a sterling 10.5 out there? Is that a dually or what do I need to watch out for there? How do you tell the difference on that one so I don’t end up with the wrong thing? Thanks
