Brake convertion 4 to 5 lug January 16, 2009, 01:33:13 AM I have some questions about to convert from 4 x 4.25 to 5 x 4.5.In front that might be an easy step to use Ford Racing part number M-1102-C which is avalible from summit racing.I like to have slotted and/or drilled rotors.My question about the front brake rotors.. The 1993 Mustang Cobra used 5 x 4.5 rotors in the front, but what size? Is it 11" or 13"?Can brake rotors that will fit Mustang Cobra 1993 be used in this conversion?The next question is about the rear.I have 10" drum brakes. Is there any 10" brake drums with pattern 5 x 4.5 which fit the the T-bird on the market or do I have re drill my old brake drums?I hope for some answers.RegardsStefan Quote Selected
Brake convertion 4 to 5 lug Reply #1 – January 16, 2009, 08:05:58 AM The 93 Cobras were 4-lug.Mk7 11" rotors are the "replacement" 5-lug rotors for the 11" Fox front 4-lug rotors.What year is your car? What rear axle? If you have an 86-88 with the 7.5, you're going to need to have custom axles made. Quote Selected
Brake convertion 4 to 5 lug Reply #2 – January 16, 2009, 09:24:27 AM actually the '93 Cobra-R had 5 lug rotors(94-04 13" brakes). but good luck finding one of those in a junkyard. :) Quote Selected
Brake convertion 4 to 5 lug Reply #3 – January 16, 2009, 09:33:03 AM Yes, but he said Cobra...not Cobra R...The 93 Cobra R's just used the std 94-98 Cobra stuff anyway.... Quote Selected
Brake convertion 4 to 5 lug Reply #4 – January 16, 2009, 01:57:47 PM Thanks for the responce.Now I understand the differences between GT, Cobra and Cobra R for the front brakes.I have a -88 T-bird with an aftermerket 9" rearend.I will order new axles for it.Need to step up from 28 splines to 35 splines. The axles I have are twisted.The question was only, is there any 10" brake drums with 5 x 4.5 that will fit? Quote Selected
Brake convertion 4 to 5 lug Reply #5 – January 16, 2009, 02:12:40 PM IF you are having rear axles made for your 9 inch, then try rear drums and backing plate off a 1973 to 79 ranchero/77 TO 79 T-BIRD or LTDII /74 to 79 cougar/71 to 73 mustang/cougar71 to 76 Torinothey come with 10x2 or some have 10x 2 1/2 with bolt pattern 5x4 1/2 Quote Selected
Brake convertion 4 to 5 lug Reply #6 – February 02, 2009, 11:07:57 AM Questions from a new member....... (for my 85 T-coupe) Eventually I hope to use my 429/C6 in the Coupe so it'll need more than the stock 7.5" rear axle. So recently I picked up an 8.8 posi from a 89 Mk7, it has the 5 lug axles, but only one caliper and JUNK rotors. Can I convert this over to Ranger/Explorer rear drums? (to match the current master cylinder and valve). Can I keep the disc set-up and use the current master cylinder and ect.? Or will I need to convert to the rear disc master cylinder? The Mk had anti-locks, would that effect a drum conversion? I was so glad to find the Mk7's 5-lug, 8.8 posi that I never even considered the front rotors could of worked, (missed opportunity) but the Mk's gone now, so I can't retrieve those parts. So, what size is the stock 85 TurboCoupe's rotors and which way is the best/least expensive way to change the front to 5-lug? Quote Selected
Brake convertion 4 to 5 lug Reply #7 – February 02, 2009, 11:29:05 AM I have a set of mk7 stock rotors, calipers, the whole set upPM if your interested. I removed to upgrade they are in good shape. Quote Selected
Brake convertion 4 to 5 lug Reply #8 – February 02, 2009, 12:18:20 PM Quote from: FoxCoupe;254911Questions from a new member....... (for my 85 T-coupe) Eventually I hope to use my 429/C6 in the Coupe so it'll need more than the stock 7.5" rear axle. So recently I picked up an 8.8 posi from a 89 Mk7, it has the 5 lug axles, but only one caliper and JUNK rotors. Can I convert this over to Ranger/Explorer rear drums? (to match the current master cylinder and valve). Can I keep the disc set-up and use the current master cylinder and ect.? Or will I need to convert to the rear disc master cylinder? The Mk had anti-locks, would that effect a drum conversion? I was so glad to find the Mk7's 5-lug, 8.8 posi that I never even considered the front rotors could of worked, (missed opportunity) but the Mk's gone now, so I can't retrieve those parts. So, what size is the stock 85 TurboCoupe's rotors and which way is the best/least expensive way to change the front to 5-lug?least expensive for the front would be '83-'92 4 cyl ranger rotors, just buy new tbird bearings.i'd keep the mk7 stock rear rotors $20 ea, and buy the caliper for the rear Quote Selected
Brake convertion 4 to 5 lug Reply #9 – February 02, 2009, 12:25:26 PM then he will have small front brakes still. Quote Selected
Brake convertion 4 to 5 lug Reply #10 – February 02, 2009, 01:01:46 PM but it is THE LEAST EXPENSIVE Quote Selected
Brake convertion 4 to 5 lug Reply #11 – February 02, 2009, 01:06:09 PM Quote from: 86Tbuzzard;254930but it is THE LEAST EXPENSIVEnot best and least expensive I got full mark vii disc set upcheapppp Quote Selected
Brake convertion 4 to 5 lug Reply #12 – February 02, 2009, 01:35:21 PM There isn't an off-the-shelf 5-lug rear drum option. 10" discs in the front and 11.5" rear discs is pretty half-assed.You'll either need to upgrade to the 11" front stuff and get a different master cylinder and run the rear discs OR use the tiny front stock brakes and use the rear drums bolted onto the 8.8 and mod the stock drums and run 94-98 Mustang axles.YOu're going to pay on one end or the other.If you're dropping in a big block, step up the brakes.... Quote Selected
Brake convertion 4 to 5 lug Reply #13 – February 02, 2009, 01:53:50 PM the 11" also requires diffrent spindle's unless you using a 87-88 turbo coupe. Quote Selected
Brake convertion 4 to 5 lug Reply #14 – February 02, 2009, 01:59:30 PM I have full assembly.... w/spindles, rotors, calipers, hoses, pads, and I even have a set of low mile tbird struts!and ABS masters.... but im not sure that would fit well with a BB Quote Selected
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