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01-09-2022, 08:21 PM | #1 |
Senior Moment
Join Date: Mar 2002
Location: Pittsburg Ca
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Drum to Disc, Changed Track Width
So Eons ago when I changed from Stock Drums to Disc Brakes on the front of my 70 I recall it widening my track width. It was at least 30 years ago I used ECE 2 1/2 drop spindles to change over to disc.
On to present day; I just put a set of 20’s on with 245/45 on the front for more side wall. I had to bring the front up 1/4 “ (easy to do with coil overs) so not to rub the outside of the tire. Now I see CPP makes a spindle that’s supposed to bring the track width back to the original drum brake spec or some where near depending on who you talk to. I even got two different answers from CPP, LOL. Anyway I have a set of theses spindles that I’m going to install as soon as I get the caliper brackets. This should give me all the tire clearance I need. I’ll keep you posted as I go along in the next couple weeks If anybody else has already done this Please let me know how it turned out for you. Apparently it’s different for different years and now that I have all QA1 Control arms who knows ???????? Going to give it a shot
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 Last edited by 1970 CST Short Wide; 01-09-2022 at 09:59 PM. |
01-09-2022, 11:08 PM | #2 |
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Re: Drum to Disc, Changed Track Width
Would love to hear you results patiently waiting your thoughts.
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01-10-2022, 12:16 AM | #3 |
67-72 parts collector,…
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Re: Drum to Disc, Changed Track Width
Besides the spindle a LOT of the track width changes with the angle of the the lower control arms.
The flatter they are, the wider the track width. So a shorter coil spring will also widen the track width because the lower control arm swings up in an arc.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
01-10-2022, 12:22 AM | #4 |
Senior Moment
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Re: Drum to Disc, Changed Track Width
Ya, I’ve been trying to get my head around this. Now I don’t have a coil spring in the traditional since, I have coil over shocks. I’ll only be into this $325 and if it works it will be well worth it. If not, live and learn
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
01-10-2022, 02:04 AM | #5 |
67-72 parts collector,…
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Re: Drum to Disc, Changed Track Width
Many people have spent a ton of money trying to make wheels fit.
When in reality, you should install the suspension you want and buy wheels that fit. Just my opinion. Too many wheel companies are building the wrong offset wheels for their “off the shelf” affordable wheels. Finally companies like Billet Specials and StreetMachinery have come up with the Speedway and Magneto wheels, with usable backspace numbers,… in a low price alternative to billet wheels.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
01-10-2022, 09:11 AM | #6 | |
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Re: Drum to Disc, Changed Track Width
Quote:
Disc brake spindles = wider track width vs. drum brake spindles. CPP makes a 'modular' drop spindle that is supposed to equal the drum brake spindle track width. The modular spindle requires the 'add-on' caliper bracket so you can select the appropriate bracket depending on what brake set-up you choose (stock caliper or aftermarket). Standard disc brake spindles w/aftermarket brake hubs can increase track width depending on the hubs. So the modular spindle w/aftermarket big-brakes may possibly wind up the same track width wise as a standard disc set-up depending on the hub + rotor-hat combo (or only slightly narrower). I think one would have to verify w/the specific brake kit manufacture to know for sure what impact the brake set-up might have to track width.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 01-10-2022 at 09:18 AM. |
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01-10-2022, 03:05 PM | #7 | |
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Re: Drum to Disc, Changed Track Width
Quote:
I agree correct back spacing should be bought after the suspension is done. That ones my Bad , my math sucks.
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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01-10-2022, 04:53 PM | #8 | |
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Re: Drum to Disc, Changed Track Width
Quote:
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. Last edited by SCOTI; 01-13-2022 at 09:07 AM. |
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01-10-2022, 09:07 PM | #9 | |
Senior Moment
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Re: Drum to Disc, Changed Track Width
Quote:
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 Last edited by 1970 CST Short Wide; 01-10-2022 at 09:14 PM. |
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01-10-2022, 10:33 PM | #10 |
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Re: Drum to Disc, Changed Track Width
Yep. They dont work w/the Lt.Duty truck brakes.
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67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
01-13-2022, 01:42 AM | #11 |
Senior Moment
Join Date: Mar 2002
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Re: Drum to Disc, Changed Track Width
Parts should be here next week. Called for ETA and they said would ship by Monday
Then we’ll put this ? To rest. Stay tuned
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
01-17-2022, 08:26 PM | #12 |
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Re: Drum to Disc, Changed Track Width
Ok so here is the answer. I put CPP module spindles on which moved my wheels IN ~ 1 inch
From where my old ECE spindles were.I measured both from Frame to top of rotor. The only thing I don’t like is there is no mount for dust shield Both sets are 2 1/2 drop. Now I can reset ride height and have it aligned
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
01-17-2022, 10:06 PM | #13 |
67-72 parts collector,…
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Re: Drum to Disc, Changed Track Width
I thought the Modular spindle from CPP were only a 2” drop?
Thanks for the measurement and info.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
01-18-2022, 12:20 AM | #14 |
Senior Moment
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Re: Drum to Disc, Changed Track Width
You know I think your right. I rechecked before and after height and ya I’m setting a bit higher so I’m IN and UP. The Up I can adjust the IN helps
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
01-18-2022, 08:53 AM | #15 |
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Re: Drum to Disc, Changed Track Width
__________________
67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... Cubic inches is like Indiana Jones with a cheap pistol. |
01-18-2022, 01:41 PM | #16 | |
67-72 parts collector,…
Join Date: Nov 2002
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Re: Drum to Disc, Changed Track Width
Quote:
I can’t keep up.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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01-19-2022, 01:06 AM | #17 | |
Hittin E-Z Street on Mud Tires
Join Date: Nov 2004
Location: Greenville, SC
Posts: 23,090
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Re: Drum to Disc, Changed Track Width
Quote:
I agree with the "off the shelf fits all" comment. I have a 68 firebird and bought a set of the 17" pontiac rally II wheels. Look killer. However, they really need to be sucked in 1/2" in the rear (fixable with rolling/cutting the fender lip) but the front really needs to go in 3/4-1" per side if you want to drop the nose of the car any at all. They're "work" with stock height springs, but barely and you have to run a small tire. These are claimed to "fit" all 1st and 2nd gens. They definitely fit the 69s and 2nd gens better (they're a couple inches wider). It's a shame because they look so great, but really, the offset is all wrong to fit 67/68s.
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Jesse James 1967 C10 SWB Stepside: 350/700R4/3.73 1965 Ford Mustang: 289/T5-5spd/3.25 Trac-Loc 1968 Pontiac Firebird: Project Fire Chicken! 2015 Silverado Double Cab 5.3L Z71 2001 Jeep Wrangler Sport 4.0L 5spd 2020 Chevrolet Equinox Premium 2.0L Turbo 2011 Mustang V6 ~ Wife's ride American Born, Country by the Grace of God 1967 CST Shop Truck Rebuild! My 1967 C-10 Build Thread My Vintage Air A/C Install Project "On a Dime" Trying my hand at Home Renovation! 1965 Mustang Modifications! |
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01-19-2022, 01:43 AM | #18 | |
Senior Moment
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Re: Drum to Disc, Changed Track Width
Quote:
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1970 CST LS 1 6 speed Ford 9 inch Detroit Tru Track, Dakota Didgital, Vintage Air, QA1 Coil Overs Front & Rear Lots of FUN 2013 GMC PU, Oldest Son 71 GMC LWB. QA1 Suspension, Angry SB. Youngest Son 2019 GMC Diesil Dually. Youngest Son 2017 Toyota SUV Daughters car 2018 Traverse , Wife’s Ride Pittsburg Ca 94565 |
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