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Hi all
Just wondering if anyone has seen, heard of, done a 5 x 4.25 rotor on a mid 70's spindle...
the spidle is from a 77 Ranchero.
Or has anyone seen an after market Rotor with 5 x 4.25 that would fit on that spindle.
FYI, was at the 29 or 30 Fabulous Ford at Knott's Berry Farm two weeks ago... what a blast
I think there was over 1200 registered cars this year.. Funny thing I was at the frist one,
held on a patch of grass back then. Was at the 10 annual Edelbrock car show this morning,
a nice 4 mile walk over... one very nice 62 in Black paint and did it shine.
I'm heading for the wreaking yard this month, half off days... pick up a IRS $130 from one of the
donor cars.. I prefer the Mark VIII if possible, but will go with the Bird or Cougar..
Best
Last edited by Sanddoc (May 3, 2015 11:20 am)
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How are you measuring the pattern? The reason I ask is 5 on 5.25" is not a Ford pattern in any model. common in A body MoPar but not Ford. I am wondering if it is 5 on 4.5" which Most Ford cars are. If you are measuring from stud to stud in a star pattern than that would explain why you are getting an incorrect measurement. Bolt pattern is based on a circle that bisects the center of all the bolts in the pattern. here is how to get the correct measurement.
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Hi Daze
think you miss read my post, but don't worry about it... 4.25 is what I wrote.
But it does bring up a point about Ford, they can't seem to understand basic economics.
In the last 50 years Ford has used everything from 5.31 to now 4.25" bolt pattern.
I am trying to make since of putting a Lincoln IRS into my wagon which is 4.25 and trying to get the
same bolt pattern on the front.. I don't like the idea of running difference sizes, either bolt patterns or
tire size.
My front spindle is from my old 77 Ranchero. which is 5 x 5
I'm not going to worry about that until after I get the IRS installed... I hope..
Did you do an IRS on one of your cars, I forget
Best
Dave
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I read your post correctly but didn't quote it very well 
I meant to say 5 on 4.25" but ended up saying 5 on 5.25". What I thought you were looking for was a replacement for a rotor you already had on the car. I assumed that you you had measured the pattern incorrectly and thought you needed 5 on 4.25" when really you probably needed what most of the 60s era cars came with 5 on 4.5".
To answer your question I do not know of any early Ford rotors that would have the small pattern to match you IRS. Have you thought about changing the pattern on the IRS?? When my brother was looking for rims for his A-body MoPar he did not have much to choose from as 5 on 4.25" is not a very common size.
The only other options I can think of would be to see if you could get the rotor and hub from the same type of car the IRS came from or maybe if you could get a MoPar rotor to work?
Yes I put a Jag IRS on my Mustang but have not done much with it as of late.
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You probably could get an aftermarket hub with the 5 x 4.25 bolt circle that will fit the bearings for that spindle. Look at Willwood and go through their hub offerings. I doubt you will find a hub-rotor with the 4.25 BC, but could you modify the original type and drill it for the other size. It could be similar to Daze's Chevy to Ford jig. I think I like Daze's suggestion to see about swapping the hubs on the IRS to a unit bearing with the 4.5 BC.
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Daze my apologies. I was a little pissed at myself and think it made it to this site.
When I had the 77 Ranchero, I took the rear end and front rotors, from a 79 Continental
the 4 wheel disc made that Rancheo stop on a dime, but the car was just a rust bucket.
anyway that is were the 5 x 5 bolt pattern came from. the 77 had 5 x 4.5 originaly.
And of course the Mark 8 IRS is 4.25, which I understand by changing the hub from a 99 cobra
you can get the 5 x4.5 bolt pattern.. That is what I meant when I said Ford just loves to
mix and match everything. a Lincoln with 4.25 bolt pattern, WHY!!!!!! when you have the
CV setup.
Anyway my local junk yard is loaded with both Tbirds and Mark's with IRS... I know the Mark
has an aluminum diff housing. Next is the bags, which I forgot or did not know about, So I need to get
a spring set for the Mark 8 and new shocks... Monroe makes a replacment setup for coils..$200 + -
All of a sudan that old original rear axle is looking good!!!!! hahaha
I've got floor pans to weld in, door jams to paint. fender welding to finish...
I let a certified welder do some patches on the fenders, and he welded with 6mm without gas...
I'm not a welder, but I'll weld the floor panels in and learn...
I'm heading to the junk yard tomorrow, I saw a 62? bird in there, going to remove some parts...
no I don't have a bird, but swing away steering column are hard to find, expansion tank, washer motor...
fan shroud if its still good.
Anyway sorry for the smart -oh no I used a word I shouldn't have- answer to you... I appreciate your work and knowledge on these cars.
BTW as a side thought, I know the CV K member will not fit a 62 galaxie, but what are your thoughts on just
using the front of wheel mounted power steering box and adapting the pump to the engine. Engine is a
351c..
Best
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Ever thought about putting a Jag IRS in that old Gal?? The reason I ask is the bolt pattern is easy to change and the Jag IRS is already the correct width... or at least close seams to me its 1/2" narrower from hub to hub. I have one for my Gal but I am not in any hurry to put it in.
If you go with the front steer R&P you will of course need to go with front steer spindles and I am not sure what front steer spindles would have the correct geometry. Or you could swap the spindles, left to right. That would maintain the correct Ackerman angle and the ball joints would obviously fit. You would also have to change out the oil pan to a rear sump. Not sure what is available for the 351C in rear sump. I think it is doable but would not be any easier than the GM j-car rack install I did IMHO.
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Daze wrote:
Or you could swap the spindles, left to right. That would maintain the correct Ackerman angle and the ball joints would obviously fit.
That information is incorrect. swapping the spindles left to right to make it front steer would give you reverse Ackerman and the outer tire would turn sharper than the inner tire which would be a mess.
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Daze what year Jag IRS would I be looking for?
I see were some are going to the R&P, I was more thinking of just using the powersteering pump and the
steering gear, in the CV the steering gear is forward of the wheels and mounts on the frame.
that would really keep the area under the master cylinder clean.
Of course my biggest project is getting a rear in the car.. ASAP
Best
Thread StarterOffline
Daze what year Jag IRS would I be looking for?
you need to look at the five web pages I put together about the IRS install in my Mustang
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