First Post..need 68 Brake Expert To Clear Confusion


New Member
Sep 14, 2017
Looking at the NPD catalog and a few other suppliers, and they are showing that a 68 390GT can could have either 1 3/4" rear drums or 2"

Took my drums off today and to my surprise, my drums measured at 2" braking surface and my shoes measure at 1 3/4" wide. So I panicked thinking something is really screwed up.

Then I read this: "1 3/4" system will have a 2" braking surface on inside of drum.

2" System will have 2 3/8-7/16 " braking surface"

If this is true, then I have a 1 3/4" rear brakes. Why are suppliers listing 2" rear drums for my car, and should I have 2" instead of 1 3/4" ?

  • Sponsors(?)


SN Certified Technician
Apr 27, 2001
Cincinnati Ohio
If I remember from my days working at Midas in the mid 70s, Sounds like you have the 1 3/4 system. I believe you would order by size of the shoe (not the drums actual surface) so you would order the 1 3/4 system but you would actually get a drum with the 2" braking surface.
Please somebody correct me if I'm wrong, It has been a long time since those days.
Thread starter Similar threads Forum Replies Date
B New At This Posting Thing Need Help 1965 - 1973 Classic Mustangs -General/Talk- 2
rainier I think this is where I post this ok need help 94 mustang gt 5.0 1994 - 1995 Specific Tech 2
D Sudden Electrical Issues and Now It Won't Start - Help Needed (Long Post) Fox 5.0 Mustang Tech 5
jeremy canter WHAT THE H3LL > I need help > long post SVT Tech Forum 2
mtaqua need to know location of molding post on window channels Classic Mustang Specific Tech 0
Nemesis4.6 First post on here guys, need some help from "noise" gurus 2005 - 2009 Specific Tech 3
D Lots of questions.....1 Post. Need help! (wheels, tires, drop) SN95 4.6L Mustang Tech 4
1 Need new headlights please post pic's and ideas 1996 - 2004 SN95 Mustang -General/Talk- 17
M Pro Cam Degreeers. NEED HELP...PLEASE..Long Post! Fox 5.0 Mustang Tech 4
85_SS_302_Coupe I have 3 Tech posts until i reach 2k posts...who needs help? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 16
jb1dsl Please read and post, need help deciding what to do!!! 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 3
bad68coupe posting pics need help Classic Mustang Specific Tech 2
H Need help posting pics?? 1994 - 1995 Specific Tech 3
J need engine help/no one looked at my post Fox 5.0 Mustang Tech 2
9 Need help deciding,post pics of 18x9,18x10.5 chrome or black wheels 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 14
94YellowStang Post Pics of Tailpipes Please (I need ideas) 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 26
8 Help Needed - Long Post Fox 5.0 Mustang Tech 24
Slow5.0 Guys with ZEX "wet" kit post here, need help Fox 5.0 Mustang Tech 0
Slow5.0 Guys with ZEX "wet" kit post here, need help 1994 - 1995 Specific Tech 13
T Need mental help posting pics please Classic Mustang Specific Tech 1
Slow5.0 Flowmaster guys post here I need help to choice RIGHT flowmaster cat-back 1994 - 1995 Specific Tech 8
D Need help ASAP posting pics of my car 1994 - 1995 Specific Tech 5
Slow5.0 TwEECer guys post here, I need help with Timing (Spark) 1994 - 1995 Specific Tech 4
Slow5.0 Guys with aftermarket here, need help ASAP 1994 - 1995 Specific Tech 2
bluevenom867 First post in 2.3 you need to read this!! 2.3L (N/A & Turbo) Tech 14
6 NEED HELP! Might have broken something! LONG POST Classic Mustang Specific Tech 10
Slow5.0 Guys with B31 AFM cam post here need to know Duration and lift Fox 5.0 Mustang Tech 5
Slow5.0 Guys with B31 AFM cam post here need to know Duration and lift 1994 - 1995 Specific Tech 4
2 Igot it I just need a little help posting 2005 - 2009 Specific Tech 0
OrangeMustangGt just got rims, Now i need springs, post em up! 1994 - 1995 Specific Tech 37
Starscream88 Post Pics of your Lowered Stangs! Need to finalise my spring choise Fox 5.0 Mustang Tech 27
none67 body/frame work (Long post, need lots of help) Classic Mustang Specific Tech 12
F8Lstang Was in an ironic accident last night-collision/legal advice needed *long post* Fox 5.0 Mustang Tech 20
50ldster First post-need advice in Albany Regional Forums and Event Information 6
H First post, Need help ! Fox 5.0 Mustang Tech 8
S Another Idle surge post with microsquirt Digital Self-tuning Forum 5
79 Fox Engine Been a while since I’ve posted. Oil in coolant. Fox 5.0 Mustang Tech 39
R 89' Stang - MS2PNP - Post tune - Surging issues Digital Self-tuning Forum 5
T Posting in poughkeepsie The Welcome Wagon 24
silverlx50 Engine UPDATED WITH FIX IN POST #49 Help with sputter issue with cold starts Fox 5.0 Mustang Tech 49
84blkstang It has been since 2006 since my last post. who is still around? 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 14
0 For Sale 2008 Shelby gt500 clean title..please read entire post S197 Mustangs For Sale (2005-14) 0
rdtavape post shift kit install problems SN95 4.6L Mustang Tech 2
Noobz347 Read Me First! ...or your posts/threads go buh bai. Services - Tuning, Welding, Mechanic, Body Work... 0
Noobz347 Post Pics of your Freshly Detailed Stangs! All Years! Mustang Sound & Shine All 54
DemonGT Interior and Upholstery Post behind rear speaker Fox 5.0 Mustang Tech 7
ChillPhatCat Progress Thread Haven't posted in a looong time... rescuing another 'stang... '89 Vert 1979 - 1995 (Fox, SN95.0, & 2.3L) -General/Talk- 20
Musseman69 Non-post hardtop out of S550 Mustang? 2015+ (S550) Mustang -General/Talk 2
Roger Dixon How Do I Post a Photo and Profile? The Welcome Wagon 1
Similar threads