IFS Hubs & FJ rotor problem

KarmirToy · 02-01-2004, 10:39 PM

I bought the FJ-40 vented rotors and Im trying to but them on IFS hubs. the problem is the stock rotors were attached to the hub by individual bolts (not the studs). Now the FJ rotor forces you to use the studs to mount rotor into place. My studs are not long enough.

has anybody run into this problem? do you guys have a part number or a vehicle type I can take to the autoparts tomarrow to get some new studs?

Lord Orange · 02-01-2004, 10:42 PM

autojoke, says " I need to see the orginal stud to give you that same part" Give it to em, and then say I need longer.

KarmirToy · 02-01-2004, 10:48 PM

this brings me to my next question...

since studs's splines fit instide the whole of the hub... adding a rotor to the back will not give the splines any contact with the hub... is that ok?

Lord Orange · 02-01-2004, 10:59 PM

splines on studs are so that when you torque down they do not spin. When you torque down you should be fine.....make sure you set that stud in correctly.

shaka 55 · 02-01-2004, 11:50 PM

If your running the ifs hubs and fj rotors on the solid axle--which I hope- cuz ifs sucks-- You need a spacer to space the fj rotor back so the ifs caliper will fit properly. Once you have the spacer, bolt the spacer to the ifs hub, and then bolt the rotor to the spacer. You will need to buy hadware for this. I was going to make my own but the drawing on the fact page is fucked. It is totally wrong. Just buy them from sky. they come with hardware and seals.

molsenmuscle · 02-02-2004, 12:05 AM

The drawing in the FAQ is for using IFS hubs and rotors, not IFS hubs and FJ rotors. The "hat" section is deeper on the IFS rotors so the spacer doesn't need to be as thick when using IFS rotors as opposed to FJ vented rotors. The whole subject is actually quite confusing to read in the FAQ and could stand to be cleared up a bit and another drawing posted of the spacer required to use a vented FJ rotor. And no, I'm not volunteering to do the article. At the rate I type it would take me a month.

shaka 55 · 02-02-2004, 12:58 AM

Dude- I here ya. I new it was for the IFS rotors and hubs-- what I was trying to tell him was that it was f

cked. The ifs rotors don't work properly with the ifs calipers mounted on the solid axle spindle and knuckle. Anyway--he doesn't need studs-- he needs spacers and some

, cuz those things are $$.

I forgot to mention that if he wants just to up grade to vented rotors--just put the fj rotors and ifs calipers on the solid axle hubs and be done with it.

RMW · 02-02-2004, 01:15 AM

the sky spacer is the way to go IMO. allows the use of the IFS calipers and FJ-40 / FJ-60 vented rotors from 1981-90.

included hardware is 2 brake rotor adapters, 12 low head allen screws, 4(four) 7/16" dowel pins, and 2 inner hub seals.

you need to supply your own IFS wheel hubs, IFS or solid axle calipers, and solid axle or FJ-40 / FJ-60 vented rotors. (technically you could reuse your SA solid caliper and your SA rotors - but who wants to do that

when you can upgrade).

and now my 85 front axle will match my 87 (IFS) rear axle in width.

RMW · 02-02-2004, 01:16 AM

forgot the pic

KarmirToy · 02-02-2004, 01:24 AM

Im not using a spacer, or kit...

I drilled out the threads in the knuckle. welded a nut on the inside of the caliper and ran a bolt through... that elminates the need of a spacer, or any other kind of 'hardware', my V6 calipers line up with thisees rotors perfect. all im concerned about is the studs... to keep the damn rotor on the hub.

suv · 02-02-2004, 01:15 PM

I recently replaced the studs on my '85, which uses the same setup as you are describing. You can use the Toyota studs (Dorman catalogs list the wrong ones for minitrucks, you need to get the Landcruiser studs), and they'll probably be the best for you. I don't have a part number for those. I wanted some that were a bit longer since I'm using some 1.5" spacers and the lugnuts didn't fully engage with the stock studs. I found that chevy studs, Dorman P/N 610-073 were about 1/4" longer and fit perfectly. They have different threads, though - 1/2-20.

tornadoalleycruiser · 02-02-2004, 02:57 PM

Try 1980 FJ40 or FJ60/62 Front wheel studs. Later FJ40's and FJ60's had the studs pressed thru the rotor and hub assembly. Some minitrucks had this setup as well.. It's kinda a tossup in the 1979 era as to whether they will be bolted on or pressed on.
Toyota has the studs think they are about $4 each last time I purchased them.

Or if your problem is you have the rotor that attaches via bolts to the back of the hub and your hub assembly needs to have the rotor pressed on via the studs.. YOur gonna need to buy new rotors! Do a search there were some cheap ones on the Cruiser section not very long ago.

I've got the sky kit sitting in the garage waiting to go on my Cruiser axle (well it's been there a while! ) thanks for the tech everyone!

KarmirToy · 02-02-2004, 10:22 PM

Quote:

Originally posted by tornadoalleycruiser
Try 1980 FJ40 or FJ60/62 Front wheel studs. Later FJ40's and FJ60's had the studs pressed thru the rotor and hub assembly.

yep you were right. those were the ones needed... heres some pics of the progress so far.

enjoy

KarmirToy · 02-02-2004, 10:24 PM

2

KarmirToy · 02-02-2004, 10:24 PM

3

KarmirToy · 02-02-2004, 10:25 PM

4

there is slight grinding with the caliper you have to do... I ran into this problem After I tightned the spindle nut.

KarmirToy · 02-02-2004, 10:26 PM

last one.... kinda weird lookin

billfj4045 · 02-03-2004, 11:23 AM

Hey KarmirXJ,

Great job and thanks for the pics!

It looks like you are using a bunch of "new" parts... any chance you could post the part numbers/sources/make/model you have used. This would sure make it easier for those doing the same upgrade.

Also, if you can give us any info on the used parts (year/make/model) that would be great too.

Thanks in advance,
Bill

rockota · 02-03-2004, 11:30 AM

so what we have here is IFS wheel hubs w/ FJ-40 rotors and IFS calipers and no spacer...

Damn... wonder why someone didn't think about mounting the caliper this way before? Seems too dang simple...

ForestCam · 02-03-2004, 11:46 AM

Quote:

Originally posted by rockota
so what we have here is IFS wheel hubs w/ FJ-40 rotors and IFS calipers and no spacer...

Damn... wonder why someone didn't think about mounting the caliper this way before? Seems too dang simple...

It has been done (kind of the redneck way of doing it

) except most people go to a 9/16" bolt and they tap the caliper.

PINESOL · 02-03-2004, 12:44 PM

holy shi-t do you guys think that would be safe for everyday
driving?
im runnig sa hubs now but i still have the ifs hubs. to top it off
im having problems with the threads in the knuckle.

i need an honest opinion should i do this hub swap?

oh btw i have fj40 rotors ifs calipers and i do have spacers.
what are the pros and cons with mounting the caliper this way.

TNToy · 02-03-2004, 01:08 PM

The main "pro" is width. When I went from the 36s to the 38.5s I gained about 6 inches in total width including the change in wheel backspaing. Made a huge difference in stability.

This would save you the trouble of having to get low B.S. wheels like I did. I don't see a problem with the way the caliper is mounted, but someone else probably will.

PINESOL · 02-03-2004, 01:22 PM

cool thanks for your reply, im running 36s and have a leaf spring
clearance issue.

OOP'S · 02-03-2004, 03:58 PM

Quote:

Originally posted by PINESOL
holy shi-t do you guys think that would be safe for everyday
driving?

I have a bad feeling about this set up. There is no support for the ears on the calipers and the ground down bolts have weakened them a bit. My feeling is that in an emergency, when you have them locked up, the calipers may snap off at the ears. What grade bolts are you using???? Just my opinion, Good luck!!!!

MattMan · 02-03-2004, 04:19 PM

That whole setup seems pretty sketchy. MAYBE for the trail, but I wouldn't venture onto the highway with that setup personally.

02-01-2004, 10:39 PM	#1
KarmirToy Registered User Join Date: Jan 2003 Member # 16666 Location: Glendale CA, stright-outada armotown from the streets, around the corner through the alley across the quicky-mart under the bridge over the traintracks passed the Mcdonalds left behind the construction yard stright in the land fill, up over the hill Posts: 1,248	IFS Hubs & FJ rotor problem I bought the FJ-40 vented rotors and Im trying to but them on IFS hubs. the problem is the stock rotors were attached to the hub by individual bolts (not the studs). Now the FJ rotor forces you to use the studs to mount rotor into place. My studs are not long enough. has anybody run into this problem? do you guys have a part number or a vehicle type I can take to the autoparts tomarrow to get some new studs?

02-01-2004, 10:42 PM	#2
Lord Orange Registered User Join Date: Dec 2001 Member # 9001 Location: Suisun Ca Posts: 3,786	autojoke, says " I need to see the orginal stud to give you that same part" Give it to em, and then say I need longer. __________________ [URL="http://www.pirate4x4.com/forum/showthread.php?t=530797"]Don't be the nice guy anymore[/URL]

02-01-2004, 10:59 PM	#4
Lord Orange Registered User Join Date: Dec 2001 Member # 9001 Location: Suisun Ca Posts: 3,786	splines on studs are so that when you torque down they do not spin. When you torque down you should be fine.....make sure you set that stud in correctly. __________________ [URL="http://www.pirate4x4.com/forum/showthread.php?t=530797"]Don't be the nice guy anymore[/URL]

02-01-2004, 11:50 PM	#5
shaka 55 Registered User Join Date: Feb 2003 Member # 17224 Location: Bonney Lake, WA Posts: 433	If your running the ifs hubs and fj rotors on the solid axle--which I hope- cuz ifs sucks-- You need a spacer to space the fj rotor back so the ifs caliper will fit properly. Once you have the spacer, bolt the spacer to the ifs hub, and then bolt the rotor to the spacer. You will need to buy hadware for this. I was going to make my own but the drawing on the fact page is fucked. It is totally wrong. Just buy them from sky. they come with hardware and seals. __________________ 76 FJ55 future buggy 69 FJ55(not done)efi "F", sm420-AAbox-3sp, full coil, LX450 elockers, york, Rino Line 85 EFI 4runner 5.29s, ARBs LC/HP front, Taco rear, Alcan fronts, 63 chevs rear, BB 2 1/2" D-train lift, Marlin 23spline dual w/4.7s, 9.5xp, OBA+CO2, Trail Readys & 37 IROKS 91 RRC

02-02-2004, 12:58 AM	#7
shaka 55 Registered User Join Date: Feb 2003 Member # 17224 Location: Bonney Lake, WA Posts: 433	Dude- I here ya. I new it was for the IFS rotors and hubs-- what I was trying to tell him was that it was f cked. The ifs rotors don't work properly with the ifs calipers mounted on the solid axle spindle and knuckle. Anyway--he doesn't need studs-- he needs spacers and some , cuz those things are $$. I forgot to mention that if he wants just to up grade to vented rotors--just put the fj rotors and ifs calipers on the solid axle hubs and be done with it. __________________ 76 FJ55 future buggy 69 FJ55(not done)efi "F", sm420-AAbox-3sp, full coil, LX450 elockers, york, Rino Line 85 EFI 4runner 5.29s, ARBs LC/HP front, Taco rear, Alcan fronts, 63 chevs rear, BB 2 1/2" D-train lift, Marlin 23spline dual w/4.7s, 9.5xp, OBA+CO2, Trail Readys & 37 IROKS 91 RRC

02-01-2004, 10:48 PM	#3
KarmirToy Registered User Join Date: Jan 2003 Member # 16666 Location: Glendale CA, stright-outada armotown from the streets, around the corner through the alley across the quicky-mart under the bridge over the traintracks passed the Mcdonalds left behind the construction yard stright in the land fill, up over the hill Posts: 1,248	this brings me to my next question... since studs's splines fit instide the whole of the hub... adding a rotor to the back will not give the splines any contact with the hub... is that ok?

02-02-2004, 12:05 AM	#6
molsenmuscle Registered User Join Date: Dec 2002 Member # 15993 Location: calgary, canada Posts: 388	The drawing in the FAQ is for using IFS hubs and rotors, not IFS hubs and FJ rotors. The "hat" section is deeper on the IFS rotors so the spacer doesn't need to be as thick when using IFS rotors as opposed to FJ vented rotors. The whole subject is actually quite confusing to read in the FAQ and could stand to be cleared up a bit and another drawing posted of the spacer required to use a vented FJ rotor. And no, I'm not volunteering to do the article. At the rate I type it would take me a month.

02-02-2004, 01:15 AM	#8
RMW Moo 2 U Join Date: Jan 2003 Member # 16565 Location: Texas Posts: 640	the sky spacer is the way to go IMO. allows the use of the IFS calipers and FJ-40 / FJ-60 vented rotors from 1981-90. included hardware is 2 brake rotor adapters, 12 low head allen screws, 4(four) 7/16" dowel pins, and 2 inner hub seals. you need to supply your own IFS wheel hubs, IFS or solid axle calipers, and solid axle or FJ-40 / FJ-60 vented rotors. (technically you could reuse your SA solid caliper and your SA rotors - but who wants to do that when you can upgrade). and now my 85 front axle will match my 87 (IFS) rear axle in width. __________________ [_] Show signatures.

02-02-2004, 01:16 AM	#9
RMW Moo 2 U Join Date: Jan 2003 Member # 16565 Location: Texas Posts: 640	forgot the pic Attached Images __________________ [_] Show signatures.

02-02-2004, 01:24 AM	#10
KarmirToy Registered User Join Date: Jan 2003 Member # 16666 Location: Glendale CA, stright-outada armotown from the streets, around the corner through the alley across the quicky-mart under the bridge over the traintracks passed the Mcdonalds left behind the construction yard stright in the land fill, up over the hill Posts: 1,248	Im not using a spacer, or kit... I drilled out the threads in the knuckle. welded a nut on the inside of the caliper and ran a bolt through... that elminates the need of a spacer, or any other kind of 'hardware', my V6 calipers line up with thisees rotors perfect. all im concerned about is the studs... to keep the damn rotor on the hub. Last edited by KarmirToy; 02-02-2004 at 01:28 AM.

02-02-2004, 01:15 PM	#11
suv Registered User Join Date: Aug 2003 Member # 21751 Location: Salt Lake City, UT Posts: 162	I recently replaced the studs on my '85, which uses the same setup as you are describing. You can use the Toyota studs (Dorman catalogs list the wrong ones for minitrucks, you need to get the Landcruiser studs), and they'll probably be the best for you. I don't have a part number for those. I wanted some that were a bit longer since I'm using some 1.5" spacers and the lugnuts didn't fully engage with the stock studs. I found that chevy studs, Dorman P/N 610-073 were about 1/4" longer and fit perfectly. They have different threads, though - 1/2-20. __________________ '85 4Runner with chrome wheels and Pioneer 6x9s

02-02-2004, 02:57 PM	#12
tornadoalleycruiser Registered User Join Date: Jun 2002 Member # 12451 Location: Kansas City, Mo Posts: 1,245	Try 1980 FJ40 or FJ60/62 Front wheel studs. Later FJ40's and FJ60's had the studs pressed thru the rotor and hub assembly. Some minitrucks had this setup as well.. It's kinda a tossup in the 1979 era as to whether they will be bolted on or pressed on. Toyota has the studs think they are about $4 each last time I purchased them. Or if your problem is you have the rotor that attaches via bolts to the back of the hub and your hub assembly needs to have the rotor pressed on via the studs.. YOur gonna need to buy new rotors! Do a search there were some cheap ones on the Cruiser section not very long ago. I've got the sky kit sitting in the garage waiting to go on my Cruiser axle (well it's been there a while! ) thanks for the tech everyone! __________________ Erik FJ45, FJ40, FJ62 TLCA #5303 Secretary

02-02-2004, 10:24 PM	#14
KarmirToy Registered User Join Date: Jan 2003 Member # 16666 Location: Glendale CA, stright-outada armotown from the streets, around the corner through the alley across the quicky-mart under the bridge over the traintracks passed the Mcdonalds left behind the construction yard stright in the land fill, up over the hill Posts: 1,248	2 Attached Images

02-02-2004, 10:24 PM	#15
KarmirToy Registered User Join Date: Jan 2003 Member # 16666 Location: Glendale CA, stright-outada armotown from the streets, around the corner through the alley across the quicky-mart under the bridge over the traintracks passed the Mcdonalds left behind the construction yard stright in the land fill, up over the hill Posts: 1,248	3 Attached Images

02-02-2004, 10:25 PM	#16
KarmirToy Registered User Join Date: Jan 2003 Member # 16666 Location: Glendale CA, stright-outada armotown from the streets, around the corner through the alley across the quicky-mart under the bridge over the traintracks passed the Mcdonalds left behind the construction yard stright in the land fill, up over the hill Posts: 1,248	4 there is slight grinding with the caliper you have to do... I ran into this problem After I tightned the spindle nut. Attached Images

02-02-2004, 10:26 PM	#17
KarmirToy Registered User Join Date: Jan 2003 Member # 16666 Location: Glendale CA, stright-outada armotown from the streets, around the corner through the alley across the quicky-mart under the bridge over the traintracks passed the Mcdonalds left behind the construction yard stright in the land fill, up over the hill Posts: 1,248	last one.... kinda weird lookin Attached Images

02-03-2004, 11:23 AM	#18
billfj4045 Still a Newbie... Join Date: Aug 2003 Member # 22382 Location: Rocklin, CA Posts: 106	Hey KarmirXJ, Great job and thanks for the pics! It looks like you are using a bunch of "new" parts... any chance you could post the part numbers/sources/make/model you have used. This would sure make it easier for those doing the same upgrade. Also, if you can give us any info on the used parts (year/make/model) that would be great too. Thanks in advance, Bill

02-03-2004, 11:30 AM	#19
rockota Registered User Join Date: Jun 2001 Member # 5371 Location: mn Posts: 2,880	so what we have here is IFS wheel hubs w/ FJ-40 rotors and IFS calipers and no spacer... Damn... wonder why someone didn't think about mounting the caliper this way before? Seems too dang simple... __________________ Brian K. Gallus

02-03-2004, 12:44 PM	#21
PINESOL Registered User Join Date: Sep 2003 Member # 22952 Location: santa rosa ca. Posts: 166	holy shi-t do you guys think that would be safe for everyday driving? im runnig sa hubs now but i still have the ifs hubs. to top it off im having problems with the threads in the knuckle. i need an honest opinion should i do this hub swap? oh btw i have fj40 rotors ifs calipers and i do have spacers. what are the pros and cons with mounting the caliper this way. __________________ beat up pos 864runner sas 36 iroks mc07 detroit arb etc. etc. etc.

02-03-2004, 01:08 PM	#22
TNToy I call her... Vera Join Date: Jul 2001 Member # 5776 Location: Memphis, TN Posts: 10,942	The main "pro" is width. When I went from the 36s to the 38.5s I gained about 6 inches in total width including the change in wheel backspaing. Made a huge difference in stability. This would save you the trouble of having to get low B.S. wheels like I did. I don't see a problem with the way the caliper is mounted, but someone else probably will.

02-03-2004, 01:22 PM	#23
PINESOL Registered User Join Date: Sep 2003 Member # 22952 Location: santa rosa ca. Posts: 166	cool thanks for your reply, im running 36s and have a leaf spring clearance issue. __________________ beat up pos 864runner sas 36 iroks mc07 detroit arb etc. etc. etc.

02-03-2004, 04:19 PM	#25
MattMan Registered User Join Date: May 2001 Member # 4522 Location: AZ Posts: 369	That whole setup seems pretty sketchy. MAYBE for the trail, but I wouldn't venture onto the highway with that setup personally. Last edited by MattMan; 02-03-2004 at 04:21 PM.

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