3/4 ton front disk brakes - The 1947 - Present Chevrolet & GMC Truck Message Board Network

REPO1 · 04-01-2002, 08:16 AM

Just want to carify something. If I want to convert to disk brakes on my '70 3/4 ton, I understand that I can find spindles/rotors/calipers off of a '73-'87 3/4 ton? I also understand that I will need the newer ball joints as well.

But what I am not sure of, is can I use my original control arms? Or do I need the newer ones of those also? Will the disk setup work with my manual brakes, until I can do that swap? Will a new style booster/cylinder work on our trucks also?

Thanks!!!
Reid

------------------
Sylvan Lake, Alberta, Canada

1970 Chevy C20 Custom Camper
#s matching 402BB Turbo 400 trans.
Air conditioning, power steering, manual brakes.
73,600 Original Miles!!
(Add on 2000 more from raod trip!)

69 longhorn · 04-01-2002, 09:08 AM

The 3/4 ton parts fit from 71-86 or 7. You do have to change balljoints,& may run into a centerlink/tierod problem(use 71 up pcs).You can use the lower a arms,but may have to modify the steering stops to get the full turning radius. On the master cyl,you can set up as manuel brakes, but will need the manuel disc cyl. The later boosters can be made to fit,but are not a bolt on. Good luck......69 longhorn.

REPO1 · 04-01-2002, 09:53 AM

Can you explain the steering parts problem a bit more?

Do you mean I need a new center link, and tie-rods? Can these be used from the donor truck or would they need to be of the older years?

69 longhorn · 04-01-2002, 10:06 AM

Nobody has any info (consistant info ) on the center link. If you use 71-up on the center link,you will avoid any miss match on parts. The tierod assys are also different from 70 to 71(different lenghts&thread size). You can use pcs from a donor truck,& just replace with new as needed(best to pull the parts off the same truck 71-up),then when ordering parts there is less confusion. Hope that explains it better....69 longhorn.

Mike C · 04-01-2002, 10:17 PM

I used my '70 centerlink and used the '71 tie rod ends and adjusters along with the '71 ball joints. It all worked fine. I cut the frame pieces that the brake lines mount to off the donor truck and welded them on the the front of my crossmember. I bought new steel lines from Inline Tube (buy direct from them and save $) The disc lines run in front of the spindle while the drum line is behind. Same clips on crossmember secure both. I also had to buy reman calipers as the ones that came with my parts vehicle were wrong type for stock hoses. Your best bet is get all of the pieces from a 71-72 3/4 ton truck INCLUDING the booster as the drum one isn't enough IMO, and I'm still running it...

------------------
70 GMC 3/4 ton Sierra Grande 402/TH400
72 Jimmy 4WD 4spd 4" & 35's
64 Corvette Coupe
68 Camaro 'vert TPI & TH700
69 Z/28 355 12.6's @110
72 Datsun 240Z-ol' reliable

REPO1 · 04-01-2002, 10:25 PM

Thanks for the info guys.

I really think I am going to have to concentrate on finding the parts off of a newer style truck though. The chances of me finding a '71-'72 3/4 ton around these parts are slim-to-none. But the '73-'87 trucks are a dime-a-dozen.

Rod · 04-01-2002, 10:44 PM

I have a 72 3/4 2wd chassis sitting near here... here being near Winnipeg Manitoba Canada. Minty straight no rust frame ... but no body around here wants it... it had 60000 mles on it.. friend bought it for the Bed. And parted the rest... I got the frame cause I stored it for him. The front brakes are all still in tact. Hey its still in Canada it may be worth shipping to you the parts if your interested...make an offer I cant refuse

REPO1 · 04-01-2002, 10:48 PM

Hey Rod, email me off list at repo1@shaw.ca

What all does it have on it? Would you sell just the front suspension stuff? Or do you want to get rid of the entire frame as a complete unit.

Is it a rolling frame? Coil or leaf springs?

Reid

Rod · 04-02-2002, 06:52 PM

Its a coils spring unit,.. very good trailing arms.. very good cab frame mounts, discs look well within tolerance and no scaring, pads are very good... calipers are there also, it had a detroit locker in it.. Had

... we all know who kept that.

but the diffs still there. Amazingly this is the only eaton - corporate diff I ever took apart and the gears were shot... but the locker was good.....I guess I would part it ... bring me a rustfree Alberta Cab when you some get it..lol. Can ship pieces probably also... but busy I am,I am said Sam.

Rod · 04-02-2002, 06:55 PM

I guess it could be a rolling frame.... no tires on it but I have some. Its sitting on wooden blocks now. Has PS box and brake lines were not cut. It a sweet frame actually... best I have. Has coil overloaders also.

bbs1965 · 04-02-2002, 06:57 PM

too bad your not in Texas I have whole setup for $50

Rhino · 04-02-2002, 07:03 PM

bbs1965- what area of texas...I am in east texas and interested in doing this swap on my 68 3/4...maybe we could get together.......

------------------

04-01-2002, 08:16 AM	#1
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	3/4 ton front disk brakes Just want to carify something. If I want to convert to disk brakes on my '70 3/4 ton, I understand that I can find spindles/rotors/calipers off of a '73-'87 3/4 ton? I also understand that I will need the newer ball joints as well. But what I am not sure of, is can I use my original control arms? Or do I need the newer ones of those also? Will the disk setup work with my manual brakes, until I can do that swap? Will a new style booster/cylinder work on our trucks also? Thanks!!! Reid ------------------ Sylvan Lake, Alberta, Canada 1970 Chevy C20 Custom Camper #s matching 402BB Turbo 400 trans. Air conditioning, power steering, manual brakes. 73,600 Original Miles!! (Add on 2000 more from raod trip!) __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

04-01-2002, 09:08 AM	#2
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	The 3/4 ton parts fit from 71-86 or 7. You do have to change balljoints,& may run into a centerlink/tierod problem(use 71 up pcs).You can use the lower a arms,but may have to modify the steering stops to get the full turning radius. On the master cyl,you can set up as manuel brakes, but will need the manuel disc cyl. The later boosters can be made to fit,but are not a bolt on. Good luck......69 longhorn. __________________ http://community.webshots.com/user/hotrodhorn

04-01-2002, 09:53 AM	#3
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Can you explain the steering parts problem a bit more? Do you mean I need a new center link, and tie-rods? Can these be used from the donor truck or would they need to be of the older years? __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

04-01-2002, 10:06 AM	#4
69 longhorn Registered User Join Date: Aug 2001 Location: rock island,il,usa Posts: 5,382	Nobody has any info (consistant info ) on the center link. If you use 71-up on the center link,you will avoid any miss match on parts. The tierod assys are also different from 70 to 71(different lenghts&thread size). You can use pcs from a donor truck,& just replace with new as needed(best to pull the parts off the same truck 71-up),then when ordering parts there is less confusion. Hope that explains it better....69 longhorn. __________________ http://community.webshots.com/user/hotrodhorn

04-01-2002, 10:17 PM	#5
Mike C Registered User Join Date: Dec 1999 Location: Austin, TX, USA Posts: 7,723	I used my '70 centerlink and used the '71 tie rod ends and adjusters along with the '71 ball joints. It all worked fine. I cut the frame pieces that the brake lines mount to off the donor truck and welded them on the the front of my crossmember. I bought new steel lines from Inline Tube (buy direct from them and save $) The disc lines run in front of the spindle while the drum line is behind. Same clips on crossmember secure both. I also had to buy reman calipers as the ones that came with my parts vehicle were wrong type for stock hoses. Your best bet is get all of the pieces from a 71-72 3/4 ton truck INCLUDING the booster as the drum one isn't enough IMO, and I'm still running it... ------------------ 70 GMC 3/4 ton Sierra Grande 402/TH400 72 Jimmy 4WD 4spd 4" & 35's 64 Corvette Coupe 68 Camaro 'vert TPI & TH700 69 Z/28 355 12.6's @110 72 Datsun 240Z-ol' reliable __________________ 44 Willys MB 52 M38A1 64 Corvette Coupe 68 Camaro 'vert LT1 & TH700 69 Z/28 355 12.6's @110 69 Chevy Short Step 4 1/2"/7" drop 72 Jimmy 4WD 4spd 4" & 35's 02 GMC 2500HD 4x4 Duramax

04-01-2002, 10:25 PM	#6
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Thanks for the info guys. I really think I am going to have to concentrate on finding the parts off of a newer style truck though. The chances of me finding a '71-'72 3/4 ton around these parts are slim-to-none. But the '73-'87 trucks are a dime-a-dozen. __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

04-01-2002, 10:44 PM	#7
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	I have a 72 3/4 2wd chassis sitting near here... here being near Winnipeg Manitoba Canada. Minty straight no rust frame ... but no body around here wants it... it had 60000 mles on it.. friend bought it for the Bed. And parted the rest... I got the frame cause I stored it for him. The front brakes are all still in tact. Hey its still in Canada it may be worth shipping to you the parts if your interested...make an offer I cant refuse __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

04-01-2002, 10:48 PM	#8
REPO1 Shortbox wanna-be. Join Date: Mar 2002 Location: Fort St.John, British Columbia, Canada Posts: 773	Hey Rod, email me off list at repo1@shaw.ca What all does it have on it? Would you sell just the front suspension stuff? Or do you want to get rid of the entire frame as a complete unit. Is it a rolling frame? Coil or leaf springs? Reid __________________ 1970 Chevy C20 Custom Camper 402BB Turbo 400 trans. (Slowly becoming a '70 shortbox 1/2 ton) '71 Camaro SS 402/T400 resto '97 Z28 (11.41@127MPH)

04-02-2002, 06:52 PM	#9
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	Its a coils spring unit,.. very good trailing arms.. very good cab frame mounts, discs look well within tolerance and no scaring, pads are very good... calipers are there also, it had a detroit locker in it.. Had ... we all know who kept that. but the diffs still there. Amazingly this is the only eaton - corporate diff I ever took apart and the gears were shot... but the locker was good.....I guess I would part it ... bring me a rustfree Alberta Cab when you some get it..lol. Can ship pieces probably also... but busy I am,I am said Sam. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

04-02-2002, 06:55 PM	#10
Rod Join Date: Dec 1999 Location: Eastern - Manitoba Canada, Winnipeg Posts: 4,369	I guess it could be a rolling frame.... no tires on it but I have some. Its sitting on wooden blocks now. Has PS box and brake lines were not cut. It a sweet frame actually... best I have. Has coil overloaders also. __________________ Senior active founding member. 70 3/4 ton GMC Suburban 4x4 250/4 spd. 71 1/2 ton Suburban Chevy 4x4, 350/350 72 Chev 1 ton tow truck 402BB w/Holmes 440 wrecker on propane 2005 FLSTSCI Harley Springer 85 FXSB Harley Lowrider 72 Triumph 650 Bonneville 5spd "Poor people don't have hobbies" Quote from wife.

04-02-2002, 06:57 PM	#11
bbs1965 Open Sundays 10 till 10 Join Date: Nov 2000 Location: Waxahachie,Texas 75165 Posts: 1,009	too bad your not in Texas I have whole setup for $50 __________________ 817-846-5476 parts for sale always 30 minutes south of Dallas on I35 WWW.BBSAutoSalvage.com bbs1969@direcway.com

04-02-2002, 07:03 PM	#12
Rhino Registered User Join Date: Mar 2002 Location: carthage, tx Posts: 108	bbs1965- what area of texas...I am in east texas and interested in doing this swap on my 68 3/4...maybe we could get together....... ------------------ __________________ 1968 C20 long bed http://home.earthlink.net/~yup00

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