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Redrill SN95 Hubs?
#1

We all know the 5-lug swap is extremely popular, but has anyone ever put on a set of SN95 spindles/hubs and drilled them out for the 4-lug pattern?

As always I've got a bunch of spare SN95 parts laying around but I'd rather keep my 4-lug wheels. Just curious if anyone has gone this route.
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#2

It's not a simple mod. The two lug patterns (4 on 4.25" and 5 on 4.5") interfere so you would have to weld and redrill.
Your best bet would be to find 4-lug rotors that would fit the SN95 spindles.

I realize this is the opposite of what you want to do but it's a method to investigate for your application using available parts.
For example, the low buck 5-lug swap on a Fox using Aerostar rotors and Ranger axles. They fit with no mods and the brakes stay the same but you get the 5-lug wheel option.
(2) 84.5 TurboGT 'verts/84.5 TurboGT hatch/(3) 86 SVOs
86 LX 2.3 (project Ratstang)/04 SVT Focus #1276
77 F-350/40 Ford Sedan/67 Fairlane GT
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#3

I had looked into that originally, but with the lack of popularity of 4 lug products, I haven't been able to find any that would take any less work than welding and redrilling. That was the reason for my curiosity.
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#4

wickedsnake00 Wrote:I had looked into that originally, but with the lack of popularity of 4 lug products, I haven't been able to find any that would take any less work than welding and redrilling. That was the reason for my curiosity.
Ok, I've never looked into it so I wasn't sure if there was an option.
On the weld/drill method iirc you only need to weld one hole if you're careful where you layout the pattern. I drew it out in AutoCad years ago but have no idea where the file is.
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#5

(02-28-2020, 09:17 PM)Paul LeDuc Wrote:  Ok, I've never looked into it so I wasn't sure if there was an option.
On the weld/drill method iirc you only need to weld one hole if you're careful where you layout the pattern. I drew it out in AutoCad years ago but have no idea where the file is.

Most of the four lug setups are for FWD cars. Obviously I can't use the front wheel ones. Not many use a sealed bearing like the SN cars, and those that do use a much smaller shaft. I think the risk and effort of re-drilling is probably much lower than machining down the spindle and using little FWD rear bearings.

I did the trig and even with aligning one of the bolt holes between the two there's barely any overlap.

If/when I get around to it I'll have to post back with results.
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#6

Have you tried contacting the manufacturer and obtaining undrilled blanks?
2017 F150 Ecoboost 3.5 TT (sold)
2017 Mustang GT PP (sold)
2019 Mustang EcoBoost (sold) 
86 SVO not stock
83 Ford Ranger project
2019 E350 service body, work truck and tow rig.
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#7

(02-28-2020, 09:17 PM)Paul LeDuc Wrote:  On the weld/drill method, IIRC you only need to weld one hole if you're careful where you layout the pattern. 

Correct ~ and the only reason for having to weld is because of the different bolt circles. If each pattern had the same B/C, one of the lug holes would remain as-is and the other three could be drilled into a virgin portion of the 5-bolt rotor or axle flange......altho two would  be fairly close to each other with a center-to-center spacing just a skosh over 5/8".

OTOH, it could be done w/o welding if one were able to locate a (custom/unobtanium)  wheel stud having a .250-ish larger-diameter knurled shank AND a mill were used to bore that stud's hole off-center by 1/8-inch, lol. 

BTW......THIS looks kinda scary!!  [Image: happy0035.gif]
Placerville, California
(former)  2.3T '78 Courier ~ (current)  2.3T '87 Ranger & '82 Mazda B2200 (smog-exempt diseasel truck)
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#8

Wil wood and others sell undrilled rotor blanks.
2017 F150 Ecoboost 3.5 TT (sold)
2017 Mustang GT PP (sold)
2019 Mustang EcoBoost (sold) 
86 SVO not stock
83 Ford Ranger project
2019 E350 service body, work truck and tow rig.
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#9

(04-10-2020, 12:19 PM)Ductape Wrote:  Wilwood and others sell un-drilled rotor blanks.
.
Please forgive my ignorance, Kent (I've never owned an SN95 Mustang) ~ BUT........aren't the rotors and hubs separate? I.e., don't the rotors simply slide over the studs of a separate hub? Is so, you'd need un-drilled rotors AND un-drilled hubs. If that's the case and Wilwood sells both in un-drilled versions.......I'll betcha that the total price for all four pieces (not to mention the cost of having 'em indexed & drilled by a machinist) would make one's wallet hurt!!  [Image: confused0016.gif]

Another point of my ignorance about SN95's was aroused when reading that their front hubs and "axles"  are made as a flanged assembly  (with sealed bearings) that bolts to the spindle, aka "knuckle" ~ as opposed to the the 4-lug spindles/knuckles having an axle that's integral with the forging. If that's true, then the only way I envision using the 4-lug Cobra wheels on an SN95 Mustang would be to mod/re-drill the hubs for 4 lugs, along with using the larger '93 Cobra 4-lug rotors. But......DUNNO!  [Image: confused0024.gif]
Placerville, California
(former)  2.3T '78 Courier ~ (current)  2.3T '87 Ranger & '82 Mazda B2200 (smog-exempt diseasel truck)
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#10

(04-10-2020, 08:27 PM)TurboRay Wrote:  
(04-10-2020, 12:19 PM)Ductape Wrote:  Wilwood and others sell un-drilled rotor blanks.
.
Please forgive my ignorance, Kent (I've never owned an SN95 Mustang) ~ BUT........aren't the rotors and hubs separate? I.e., don't the rotors simply slide over the studs of a separate hub? Is so, you'd need un-drilled rotors AND un-drilled hubs. If that's the case and Wilwood sells both in un-drilled versions.......I'll betcha that the total price for all four pieces (not to mention the cost of having 'em indexed & drilled by a machinist) would make one's wallet hurt!!  [Image: confused0016.gif]

Another point of my ignorance about SN95's was aroused when reading that their front hubs and "axles"  are made as a flanged assembly  (with sealed bearings) that bolts to the spindle, aka "knuckle" ~ as opposed to the the 4-lug spindles/knuckles having an axle that's integral with the forging. If that's true, then the only way I envision using the 4-lug Cobra wheels on an SN95 Mustang would be to mod/re-drill the hubs  for 4 lugs, along with using the larger  '93 Cobra 4-lug rotors. But......DUNNO!  [Image: confused0024.gif]

      My ef-up Ray I skimmed and thought he was trying to get sn95 sized rotors for his 4 lug set-up. Too da**ed much going on.
2017 F150 Ecoboost 3.5 TT (sold)
2017 Mustang GT PP (sold)
2019 Mustang EcoBoost (sold) 
86 SVO not stock
83 Ford Ranger project
2019 E350 service body, work truck and tow rig.
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