5 lug front rotor conversion...need help - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 17 (permalink) Old 01-06-2003, 08:12 PM Thread Starter
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5 lug front rotor conversion...need help

I am in the process of swapping out my 4 lug front rotors for a set of 5 lug rotors. Im keeping the front brakes 10" -SAME AS STOCK. The rotors are from a 2WD 1984 Ford Ranger pickup, which is supposed to be a direct swap if you dont want to upgrade to a 11" brake rotor. Anyway, does anyone know if I should use the bearings that TIMKEN lists for a mid 80's Mustang? Or should I use the bearings that are listed for the Ranger pick up? The part number listed for the seal is the same for both the Mustang and Ranger(#6815).
The Ranger lists the inner bearing as(#SET6) and the outer bearing as(#SET2)
The Mustang lists the inner as(#SET17)and outer as(#SET12).
Does anyone have experience with this?
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post #2 of 17 (permalink) Old 01-06-2003, 08:52 PM
 
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5 lug front rotor conversion...need help

You might want to check this page out... http://www.coolcats.net/tech/advanced/4to5lug.html It appears that isn't a direct bolt on swap. It mentions what to do with the bearings as well. Good luck!
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post #3 of 17 (permalink) Old 01-06-2003, 09:17 PM Thread Starter
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5 lug front rotor conversion...need help

I DIDNT THINK IT WAS THAT COMPLICATED. I had read that it was just a straight forward swap. Actually the swap will be on a 80 T-Bird which uses the exact same 4 lug rotor as the 79-93 Mustangs. I had been under the impression that it was just a matter of proper bearing selection. The article you pointed out said that the Ranger rotors are also .25" larger than the 4 lug rotors, but the Ranger rotors I picked up, look just the same as the 4 lug set I currently have on my car. Hopefully we can get some more feedback about this, so that we all can find out. Thanks
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post #4 of 17 (permalink) Old 01-06-2003, 09:45 PM
 
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5 lug front rotor conversion...need help

If we have an 84 ranger rotor in stock I'll try to measure one at work tomorrow. Or, if you have one, you can just measure it and see if it is 10" or 10.25"...
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post #5 of 17 (permalink) Old 01-06-2003, 11:01 PM Thread Starter
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5 lug front rotor conversion...need help

I measured one of my Ranger rotors. It measures 10.25". The thing is... I'm almost sure that it matched up perfectly with the old scrap core rotors, that I got rid of when I picked up the Ranger rotors.I'll know for sure when I remove the 4 lug rotors that are on the car right now. I had been under the impression that a 10" rotor was actually a little larger than 10" across, since the machined area generally ends about 1/8" from the edge.
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post #6 of 17 (permalink) Old 01-07-2003, 06:44 PM
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5 lug front rotor conversion...need help

I have the 10.25" ranger rotors on my 79 coupe and they only required a little die grinding on the inside of the caliper to clear and it was not much work at all then matched up the correct bearing from the 2 of them and it all fit just fine. Good Luck
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post #7 of 17 (permalink) Old 01-07-2003, 11:19 PM
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5 lug front rotor conversion...need help

Here is a link to a few mustang things including 4 to 5 lug conversion on 87-93 mustangs.

http://www.fast351.com/tech/
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post #8 of 17 (permalink) Old 01-07-2003, 11:25 PM
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5 lug front rotor conversion...need help

Here I think this one covers about everything. Hope you find it helpful.


http://mjbobbitt.home.attbi.com/mustang/5lug.html
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post #9 of 17 (permalink) Old 01-08-2003, 01:22 AM
 
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5 lug front rotor conversion...need help

I did the swap with my 90 stang, I think I used the stang bearings.

Are you sure that your spindle has the correct O.D.?
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post #10 of 17 (permalink) Old 01-08-2003, 05:00 AM
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5 lug front rotor conversion...need help

look in here

http://www.mustangii.org/tech/tipsnt...eels-101.shtml
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post #11 of 17 (permalink) Old 01-08-2003, 06:32 PM Thread Starter
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5 lug front rotor conversion...need help

I checked out those sights, unfortunatly no one really spells out the proper bearing selection. I was already familiar with the sight that "smcmains" posted, I used it to do my rear 5lug conversion and select the mid 80's Ranger rotors for the front. I actually e-mailed the guy who runs that sight. He cant give me an exact selection for the bearings. He recomended measuring all the parts to choose a correct bearing selection. The sight that "joeyalex" posted offered the best info so far. It says that you must use the inner race from the Ranger and the inner bearing from the Mustang, T-bird etc. Then the outer bearing and race are from your car as well. The inner seals are the same. I'm going to pull the rotors on my car as soon as I get over the flu and see if the rotors are the same size or not. Hopefully someone out there has done this same conversion and can tell us exactly what parts to use. If and when I figure it all out I will post it for future reference.
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post #12 of 17 (permalink) Old 01-08-2003, 11:46 PM
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5 lug front rotor conversion...need help

Here's a parts list I'm copying from a CARQUEST reciept. I did this swap over late last year.

I bought two new 1985 2WD RANGER front rotor's from Autozone. I don't have there part#'s.

THESE PARTS ARE FROM CARQUEST-

2-BOS 6815 OIL SEALS
2-BGS A17 BEARINGS
2-BRG A12 BEARINGS

The part about swapping certain races are true. It's really not hard at all. GOOD LUCK~!


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[ This Message was edited by: PONY1 on 1/9/03 11:46am ]
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post #13 of 17 (permalink) Old 01-09-2003, 05:59 PM Thread Starter
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5 lug front rotor conversion...need help

So it does appear that you use the bearings from a mustang. If you can remember...As far as using the race(s) from the Ranger, did it just involve using the inner race?
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post #14 of 17 (permalink) Old 01-09-2003, 06:01 PM Thread Starter
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5 lug front rotor conversion...need help

PONY1...did you have to mill down the Ranger rotors 1/4" or have to grind any clearance into the calipers?
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post #15 of 17 (permalink) Old 01-12-2003, 04:20 PM Thread Starter
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5 lug front rotor conversion...need help

I finially got around to pulling off one of my 4 lug rotors today. The fist thing I noticed is that the 5 lug Ranger rotors are almost 1/4" wider, as I had been told earlier. After doing a mock up I determined that just about 1/8" would need to be shaved off the inside of each caliper, both at the top and bottom. As it is now, the rotor would turn freely but does scrape slightly. I next compared the bearings. If you use the origional spindles on the Mustang or T-Bird, you will have to use the inner bearing for your car. The inside diameter of the Ranger inner bearing has too small of an inner diameter to fit over your spindle. Heres the problem, I read on the "Coolcats" sight that you need to use the Ranger's race with your inner bearing. I dont think that this will really work. The two just dont match up that well. When I dropped my inner bearing into the Rangers race, it does not fully seat. In fact it sticks up almost 1/8" higher than it does in its own origional seat. That cant be good. I checked out the grease pattern that it made on the race and verified, that the rollers are sitting up just too high in the seat. I next wondered what would happen if I used the bearing and race assembly from my car and press it into the Ranger rotor. That will not work at all. It turns out that the outside diameter of my inner race is a too big to fit in the Rangers rotor. I believe that it will work to use my outer bearing and race assembly, on the outer side of the Ranger's rotor. I am just not very comfortable with using the inner bearing from my car with the Ranger's race, if it not going to seat all the way. I think this would result in extra heat and premature bearing wearout or failure. I'm going to continue to research this, but wonder if some of you have used this combination and if so have you observed any problems?

[ This Message was edited by: BBCFORD on 1/13/03 4:26am ]
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