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1st Generation 1964 1/2 - 1973 - Questions & general discussions that apply to a specific year => 1970 Mustang => Topic started by: ng8264723 on April 14, 2020, 01:35:42 AM

Title: 1970 428 brake drums Were they ribbed?
Post by: ng8264723 on April 14, 2020, 01:35:42 AM: How do identify if they are original?
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: J_Speegle on April 14, 2020, 03:11:49 PM: Are you asking about front or rear brake drums?
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: ng8264723 on April 14, 2020, 08:14:40 PM: Sorry Jeff
the rear.....
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: rockhouse66 on April 15, 2020, 08:38:06 AM: I can't be positive about 1970 but in 1969 the Fairlane/Torino CJ rear drums had a rib on them but the Mustang ones are smooth.

EDIT: Poor choice of words - the Fairlane/Torino rear drums are finned.
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: specialed on April 15, 2020, 09:42:26 AM: Are u asking about the groove as 69-70 has 1 groove 68 has 2
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: ng8264723 on April 15, 2020, 10:26:23 AM: https://www.classicindustries.com/shop/1970/ford/mustang/parts/brakes/drums/#mz-expanded-view-1278830723401

THis is what i mean by ribs. Mine are at my shop and I am home so no they are not exactly like this but the rib orientation is. f they are original I will blast them. I will look for a part number. The car did not have a lot of miles so I thought they may be original
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: Bob Gaines on April 15, 2020, 10:37:03 AM: Quote from: ng8264723 on April 15, 2020, 10:26:23 AM
https://www.classicindustries.com/shop/1970/ford/mustang/parts/brakes/drums/#mz-expanded-view-1278830723401

THis is what i mean by ribs. Mine are at my shop and I am home so no they are not exactly like this but the rib orientation is. f they are original I will blast them. I will look for a part number. The car did not have a lot of miles so I thought they may be original
If ribs like on 2nd and 3rd picture then they are replacement .Groove around diameter like Ed mentioned but no ribs.
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: J_Speegle on April 15, 2020, 04:45:19 PM: For the rears I'm finding as others have posted. Many of the service replacements were produced with fins. Likely seen as an improved design so later parts could incorporate the change if specified in the bid.

For those reading that do have front drum brakes - like the CJ convertible in the unrestored picture thread - have found finned front drums used on that car and others during that year
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: ng8264723 on April 15, 2020, 06:24:16 PM: Ok well that stinks.Does NPD have the correct ones?
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: Mike_B_SVT on April 16, 2020, 07:51:07 PM: Here are my original rear drums ~ '70 CJ Cougar, Dearborn, with Oct 6th build date (casting date on the drum is 9J10).

Kinda hard to see, but it has a single groove running around the outer edge.
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: 70cj428 on April 18, 2020, 10:35:56 PM: "I can't be positive about 1970 but in 1969 the Fairlane/Torino CJ rear drums had a rib on them but the Mustang ones are smooth.

EDIT: Poor choice of words - the Fairlane/Torino rear drums are finned."

+1, I've been researching and documenting 1970 CJ Mustangs since the 1980's I'm 99.999% certain that Mustangs came with single groove , non finned rear drums. The finned rear drums work on a Mustang but seem to be original equipment on the Torino/Fairlanes.
Title: Re: 1970 428 brake drums Were they ribbed?
Post by: Anghelrestorations on April 19, 2020, 03:13:02 AM: There is no accurate reproduction or replacement rear drum that looks like the originals...to answer the original question.