Dart disc brake conversion kit
#1519077
10/17/13 06:25 PM
10/17/13 06:25 PM
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Joined: Jun 2004
Posts: 469
Hawaii
Dodgeballs
OP
mopar
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OP
mopar
Joined: Jun 2004
Posts: 469
Hawaii
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I'm looking to upgrade my 69 dart to 4.5 pattern disc setup. Right now it has the stock 4 piston caliper disc setup. I'm looking at this one kit that comes with most everything including the upper control arms. http://www.ebay.com/itm/380685626790?Is there anything else I might need? Should I change to a newer 2 bolt master cylinder? Will my proportioning valve setup work or should I change it?
Last edited by Dodgeballs; 10/17/13 07:31 PM.
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Re: Dart disc brake conversion kit
[Re: Dodgeballs]
#1519078
10/17/13 07:31 PM
10/17/13 07:31 PM
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Joined: Jan 2003
Posts: 16,376
dogdays
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,376
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Go directly to www.doctordiff.com and get the right stuff the first time. R.
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Re: Dart disc brake conversion kit
[Re: dogdays]
#1519079
10/17/13 07:36 PM
10/17/13 07:36 PM
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Joined: Jun 2004
Posts: 469
Hawaii
Dodgeballs
OP
mopar
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OP
mopar
Joined: Jun 2004
Posts: 469
Hawaii
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Quote:
Go directly to www.doctordiff.com and get the right stuff the first time.
R.
Thanks. I've bought stuff from him before. One of the reasons I was looking at the item I listed was that it was in California and I'm in Hawaii. Shipping gets crazy here for anything big.
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Re: Dart disc brake conversion kit
[Re: cudaboy]
#1519086
10/18/13 02:41 PM
10/18/13 02:41 PM
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Joined: Apr 2007
Posts: 2,920
Calgary, Alberta Canada
a12rag
master
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master
Joined: Apr 2007
Posts: 2,920
Calgary, Alberta Canada
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F,M,J body spindles and disc brakes - Ok, so we have heard all about the issue of 3/8" taller . . . have used these on TWO cars now, 70 C body and 70 B Body, absolutely NO ISSUES !! I have driven both cars for thousands of miles ! No bump steer, no ball joint over angling, and you actually get some further adjustablity in your wheel alignment specs. No issue on front end alignment, and tires not wearing . . .
For myself, after having done this on TWO cars, I have no issue doing it for future projects. Rotors, bearings, seals, calipers, and pads are all readily available !
Just my two cents worth . . .
Cheers,
Mark
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Re: Dart disc brake conversion kit
[Re: dogdays]
#1519088
10/19/13 11:10 AM
10/19/13 11:10 AM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Quote:
Board consensus seems to be that the slightly taller spindles from F, etc, bodies are OK, maybe even better.
Mopar Action's Rick Ehrenberg disagrees, although in this case I believe he is too married to Ma Mopar to see the truth.
Just my opinion, Rick!
R.
By actual measurement, the taller knuckles almost triple the bumpsteer.
This has been discussed ad infinitum. if you're just cruising to McDs, you'll probably never notice, I agree. But I see no reason to knowingly 'do it wrong'. Neither did MaMopar, who could have standardized on one knuckle forging and saved $$$ -- but did not.
Rick
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Re: Dart disc brake conversion kit
[Re: Rick_Ehrenberg]
#1519089
10/21/13 04:14 PM
10/21/13 04:14 PM
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Joined: Sep 2007
Posts: 14,889
up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Quote:
Quote:
Board consensus seems to be that the slightly taller spindles from F, etc, bodies are OK, maybe even better.
Mopar Action's Rick Ehrenberg disagrees, although in this case I believe he is too married to Ma Mopar to see the truth.
Just my opinion, Rick!
R.
By actual measurement, the taller knuckles almost triple the bumpsteer.
This has been discussed ad infinitum. if you're just cruising to McDs, you'll probably never notice, I agree. But I see no reason to knowingly 'do it wrong'. Neither did MaMopar, who could have standardized on one knuckle forging and saved $$$ -- but did not.
Rick
So, what causes bumpsteer?
Hint, it ain't spindle height.
So, if Ma didn't standardize on one spindle, why do the 73 and up B's, all R's, J's, F's, M's and so forth use .... the same spindle? Even though some are longitudinal t bars suspensions and some are transverse?
Just waiting for some clown to say "isoclamp".
Oh and overangling the ball joint is BS too.
Here's some facts for you rather than someone's off the cuff nonsense.
http://www.bigblockdart.com/techpages/spindles.shtml
They say there are no such thing as a stupid question.
They say there is always the exception that proves the rule.
Don't be the exception.
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Re: Dart disc brake conversion kit
[Re: Supercuda]
#1519090
10/23/13 06:17 AM
10/23/13 06:17 AM
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Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
Rick_Ehrenberg
top fuel
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top fuel
Joined: Sep 2003
Posts: 1,688
Marlboro, NY, USA
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Quote:
Quote:
Quote:
Board consensus seems to be that the slightly taller spindles from F, etc, bodies are OK, maybe even better.
Mopar Action's Rick Ehrenberg disagrees, although in this case I believe he is too married to Ma Mopar to see the truth.
Just my opinion, Rick!
R.
By actual measurement, the taller knuckles almost triple the bumpsteer.
This has been discussed ad infinitum. if you're just cruising to McDs, you'll probably never notice, I agree. But I see no reason to knowingly 'do it wrong'. Neither did MaMopar, who could have standardized on one knuckle forging and saved $$$ -- but did not.
Rick
So, what causes bumpsteer?
Hint, it ain't spindle height.
So, if Ma didn't standardize on one spindle, why do the 73 and up B's, all R's, J's, F's, M's and so forth use .... the same spindle? Even though some are longitudinal t bars suspensions and some are transverse?
Just waiting for some clown to say "isoclamp".
Oh and overangling the ball joint is BS too.
Here's some facts for you rather than someone's off the cuff nonsense.
http://www.bigblockdart.com/techpages/spindles.shtml
The factual answer is simple. For the 1973 B-body, with the rubber-isolated K-member, the UCA-to-LCA-pivot dimension increased (see graphic below), this required the taller knuckle. This same basic design was used on F, J, and M-cars, too, despite the bent-bar configuration. Excepting the 1973 rubber isolation, which prevents the K from performing its original intended purpose (tying the lognitudinals together), requiring their mass to be significantly increased, the geometry on the 1973s in fine as-is. (I have no doubt that using the short knuckles on a isolated-K car would also cause handling problems).
The site you quoted above does, in fact, show much more toe change (bumpsteer) when using the incorrect knuckles: 0.081" for the correct knuckles vs. 0.199 for the taller knuckles. Therefore, going with those numbers (I have measured greater variation) I stand corrected - there's only about 2.5 times the bumpsteer with the taller pieces.
Rick
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