andyf
Well-Known Member
Car is a 1965 Coronet. The early B body cars had the antisway bar tied to the struts. Mopar engineers sometimes used the front struts for that purpose, especially in the early days.
Doctor Diff Viper-Style 13" Front Disc Brake Kit
- Thread starter JR_Charger
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JR_Charger
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Has anyone gotten splash shields to work with drop spindles?
JR_Charger
Well-Known Member
I picked up the Dr. Diff 13" Viper brake kit a couple weeks ago. Hopefully I can figure out how to make this work with the help of the forum.
The wheel register on this is 68.68 mm, which is a bit too large for the rims I want to use. I need the wheel register to be 5-6mm smaller, and maybe the offset should be different too. I need to figure out how to measure that (measure the offset I need). The lugs also need to be longer, to use the rims I have. At this point, I don't know if the solution is another set of custom wheel hubs for the rims I have, or spacers, or different rims.
Somewhere I've read that this hub is designed for later model Mustang rims. Anyone know which rims will fit?
More problems -
I read that Dr Diff had stopped responding to phone calls, but still responded to emails, so I emailed them about this - but I didn't get a response, so maybe the internet knows.
I'm trying to figure out which direction the caliper mounting bracket goes -
A -
or B -
Also - Dr. Diff's website says the calipers must face the rear of the vehicle, which I assume is correct for 71-74 Chargers. I've seen late 60's cars with the calipers towards the front. I'm 99.999% sure I need to put my calipers towards the back, but if that's wrong and anyone wants to chime in . . .
Final thought - I'm also 99.999% sure the 2003-2006 Viper calipers are the ones I need, but possibly 2008-2010 would also work? I'm guessing 2013-17 is totally different.
The wheel register on this is 68.68 mm, which is a bit too large for the rims I want to use. I need the wheel register to be 5-6mm smaller, and maybe the offset should be different too. I need to figure out how to measure that (measure the offset I need). The lugs also need to be longer, to use the rims I have. At this point, I don't know if the solution is another set of custom wheel hubs for the rims I have, or spacers, or different rims.
Somewhere I've read that this hub is designed for later model Mustang rims. Anyone know which rims will fit?
More problems -
I read that Dr Diff had stopped responding to phone calls, but still responded to emails, so I emailed them about this - but I didn't get a response, so maybe the internet knows.
I'm trying to figure out which direction the caliper mounting bracket goes -
A -
or B -
Also - Dr. Diff's website says the calipers must face the rear of the vehicle, which I assume is correct for 71-74 Chargers. I've seen late 60's cars with the calipers towards the front. I'm 99.999% sure I need to put my calipers towards the back, but if that's wrong and anyone wants to chime in . . .
Final thought - I'm also 99.999% sure the 2003-2006 Viper calipers are the ones I need, but possibly 2008-2010 would also work? I'm guessing 2013-17 is totally different.
andyf
Well-Known Member
You'll have to bolt it together and figure out how it fits. I designed all of those parts and I don't remember which way the things fit together. But it would only take me about 15 minutes to put the assembly together if I had the parts in my hand. The hubs were originally designed for Mustang rims because back when I designed these parts the Mustang rims were the best choice for big wheels with a correct backspacing, 5 lug pattern, and wheel designs that worked okay for a classic Mopar. Everything was designed around the Mustang rim. If you use the correct rim then you automatically get the correct backspacing, caliper clearance, wheel clearance, lip clearance, etc. It was designed as a system.
Maybe he’s at Carlisle.
JR_Charger
Well-Known Member
Surely you have a picture somewhere that shows how which way the bracket goes?
Which Mustang rim (or rims)?
JR_Charger
Well-Known Member
Hours of research later -
The rims are going to be anything that works on a 94-2004 Mustang. The Bullitt style rim is a 17", but 18" aftermarket versions of that rim are available. Offset is 30 or 32mm and backspacing is 5.72 inches. Some Cobra rims have 6.12 inches of backspacing. Don't know if that is too much or not. 2005 and up Mustangs have 6.25 inches of backspacing, which is in the "too much" range.
After reviewing Andy Finkbeiner's "B-Body Performance Upgrades" again, it appears Dr. Diff had/has a 13" Mustang Cobra front brake kit, and had a 14" Viper front brake kit. The Viper kit was not popular and was discontinued. Possibly it may have required 19" and larger rims. The 13" Viper brake kit I bought from Dr. Diff may have originally been Mancini Racing's 13" Viper brake kit. It looks like it may indeed use the 1994-2002 Viper calipers, which are far cheaper and easier to find than the 2003 and up calipers. O'Reilly's sells a Brake Best (Cardone) remanufactured Viper caliper for $100 + $50 core charge. Looks like they paint over the logo, which takes away from the charm of the caliper, but that's the smartest way to go.
The XXR 555's I have, are 35mm offset and 6.13 backspacing. They are also available in 25mm offset and 5.73 backspacing.
AI says -
"XXR 555 Ford Mustang
The XXR 555 wheel is compatible with the 2004 Ford Mustang. Specifically, the XXR 555 Flat Black Wheel; 17x8 with a 35mm offset is designed for 1999-2004 Mustang models.
Additionally, there is a mention of a 2007 Ford Mustang GT equipped with 18x9.5 XXR 555 wheels with a +35 offset, which runs on stock suspension without any modifications.
This suggests that XXR 555 wheels can be used on various Mustang models, including the 2004 variant, with appropriate sizing and offset."
Here's the 2004 Mustang on XXR 555's.
I'm missing something here - the advertised wheel bore size on the XXR 555 is 73.1 mm, I measured 68.68 on the Dr. Diff wheel hub, and I found a guy with XXR 531s (73.1mm center bore) on his 1994 Mustang Cobra.
Let's go have a look -
Most of that gap will be taken up by the brake rotor, but not all of it.
The center bore has a lip on the outside, and that was throwing me off.
Maybe all I need is a thin spacer or hub centric ring, and I'm in business?! Holy cow, now that would be awesome!
The rims are going to be anything that works on a 94-2004 Mustang. The Bullitt style rim is a 17", but 18" aftermarket versions of that rim are available. Offset is 30 or 32mm and backspacing is 5.72 inches. Some Cobra rims have 6.12 inches of backspacing. Don't know if that is too much or not. 2005 and up Mustangs have 6.25 inches of backspacing, which is in the "too much" range.
After reviewing Andy Finkbeiner's "B-Body Performance Upgrades" again, it appears Dr. Diff had/has a 13" Mustang Cobra front brake kit, and had a 14" Viper front brake kit. The Viper kit was not popular and was discontinued. Possibly it may have required 19" and larger rims. The 13" Viper brake kit I bought from Dr. Diff may have originally been Mancini Racing's 13" Viper brake kit. It looks like it may indeed use the 1994-2002 Viper calipers, which are far cheaper and easier to find than the 2003 and up calipers. O'Reilly's sells a Brake Best (Cardone) remanufactured Viper caliper for $100 + $50 core charge. Looks like they paint over the logo, which takes away from the charm of the caliper, but that's the smartest way to go.
The XXR 555's I have, are 35mm offset and 6.13 backspacing. They are also available in 25mm offset and 5.73 backspacing.
AI says -
"XXR 555 Ford Mustang
The XXR 555 wheel is compatible with the 2004 Ford Mustang. Specifically, the XXR 555 Flat Black Wheel; 17x8 with a 35mm offset is designed for 1999-2004 Mustang models.
Additionally, there is a mention of a 2007 Ford Mustang GT equipped with 18x9.5 XXR 555 wheels with a +35 offset, which runs on stock suspension without any modifications.
This suggests that XXR 555 wheels can be used on various Mustang models, including the 2004 variant, with appropriate sizing and offset."
Here's the 2004 Mustang on XXR 555's.
I'm missing something here - the advertised wheel bore size on the XXR 555 is 73.1 mm, I measured 68.68 on the Dr. Diff wheel hub, and I found a guy with XXR 531s (73.1mm center bore) on his 1994 Mustang Cobra.
Let's go have a look -
Most of that gap will be taken up by the brake rotor, but not all of it.
The center bore has a lip on the outside, and that was throwing me off.
Maybe all I need is a thin spacer or hub centric ring, and I'm in business?! Holy cow, now that would be awesome!
JR_Charger
Well-Known Member
Hmm - top caliper is 94 Viper, bottom caliper is 04 Viper. Which one looks like it's bottom mounted?
It's clearly the newer caliper, isn't it? The bolts go all the way through it.
It's clearly the newer caliper, isn't it? The bolts go all the way through it.
Last edited:
Curious as to why it needs to be hubcentric?
JR_Charger
Well-Known Member
Technically, it doesn't. I got my car with lug-centric slotted mags on adapter rings, and drove it for many years without issue. That was a very lo-po version of the car with half a foot of sidewall in the wheel. I'd prefer for this version of the car to have the wheels mounted hub centric if possible.
Pretty much every drag car out there is bolt centric just saying . I wouldn't sweat that part
JR_Charger
Well-Known Member
Hub centric is in one of the mopar performance books I have - or both. I don't think it will be hard to get. If my center bore is 73.1, and 94-04 factory Mustang rims are 70.5, and the Dr. Diff custom hub is 68.68, Then I only need a mm thick centering ring to be good. I need to look up how tight the fit needs to be. We slip these rims on, we don't hammer them on, so there is some gap on factory set ups. With any amount of gap, I'd think the rim would be riding more on the lugs than the hub. How much flex can there be in the center bore of the rim, and how much force would it take to make the center bore close that tiny gap, and wouldn't that work the lugs loose over time?
I'm more worried about that lip on the face side of the center bore. I wish that wasn't there. And I'm worried about any amount of the hub pushing more than 3/8 beyond that lip, or the XXR center cap won't fit on. The Dr. Diff hubs might not push out that far though. The factory hub sure does.
I'm more worried about that lip on the face side of the center bore. I wish that wasn't there. And I'm worried about any amount of the hub pushing more than 3/8 beyond that lip, or the XXR center cap won't fit on. The Dr. Diff hubs might not push out that far though. The factory hub sure does.
autoxcuda
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Yes the second set, that is newer. that’s the radial mount.
JR_Charger
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Going back to post 23, do you know what direction the black caliper mounting bracket goes?
autoxcuda
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Unfortunately, No I don’t
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