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#1 |
Registered User
![]() Join Date: Sep 2007
Location: Rufus Oregon
Posts: 1,187
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disc brakes on a 1970 longhorn
Just bought a '70 Longhorn with factory disc brakes!! This is not a '71 model. VIN on this is as follows: ce240z120631. This truck come out of southern Idaho. I live in North central Oregon. Brakes were not put on as a upgrade. Still have factory rivets on upper ball joints. Has anyone ever come across early setup like this? Truck will be parted out next year. Also come with a after market canopy for a 8 1/2 foot bed!! It's going on my project '71 longhorn. Any insight into this would be great.
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#2 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,698
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Re: disc brakes on a 1970 longhorn
Welcome to the board.
Factory rivets only mean the upper ball joints haven't been changed in those a-arms. The entire suspension could have still been swapped out with 71-72 parts. 42 years is a long time to not have anything done. I was converting these old trucks to disc brakes back in the late 80's. Please post up some pics when you get a chance.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#3 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,737
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Re: disc brakes on a 1970 longhorn
I have to agree with keith that the front was changed at some point. Discs came out in 71.
And yeah, lets see some pics...
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#4 |
Registered User
Join Date: Sep 2011
Location: Ark City, Kansas
Posts: 3,339
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Re: disc brakes on a 1970 longhorn
Many parts books list disc as an option, in 1970, seen s few 70's w/ disc.......
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#5 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: disc brakes on a 1970 longhorn
Have to agree. That VIN is fairly high out of Freemont and its possible. Would be interested in the build date and if the frame numbers match. Need to dig out my '70 truck data book and see if there is anything there. But in all likelyhood it is a transplant.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#6 |
Registered User
Join Date: Apr 2009
Location: Dallas, NC
Posts: 9
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Re: disc brakes on a 1970 longhorn
I too have a 70 with disc up front; it has not been switched. Late 70's had disc up front as did the 71 & 72's.
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#7 |
Roadtrip!
![]() Join Date: Feb 2003
Location: Grand Rapids MN
Posts: 13,737
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Re: disc brakes on a 1970 longhorn
I will stick with the disc brakes coming out on the 71 models (9-70) Some of the books do list discs as an option, but i think that is on the elcamino. If it was an option in 70, wouldn't it be listed on the spid? That would also mean it would be 5 lug stuff in 1970? Until i see otherwise...
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67 gmc custom lwb dakota truck. Sold...And bought back 69 swb 4x4 project (in progress) 70 c-10 lwb texas truck 70 4x4/BB/bkts/posi/tach(retired) 70 swb (wifes) 70 jimmy camper 71 K-5 factory 2wd 71 cheyenne 4x4/tach/posi/ plow rig 71 Cheyenne20 BB, buckets, tach, tilt, 4 speed 72 jimmy CST wyoming rig 72 jimmy Colorado rig 72 lifted texas 4x4 3/4 ton burb 65 fury conv. 383/auto 65 chrysler 300 "L" 413 auto |
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#8 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: disc brakes on a 1970 longhorn
I remember that truck. It had a Cummins swap done to it so anything is possible. The SPID was painted over so its hard to know how it was optioned. However it is a light GVW truck and badged Custom Camper 20. The cap per the story was custom made for the previous owner.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#9 |
Registered User
![]() Join Date: Sep 2007
Location: Rufus Oregon
Posts: 1,187
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Re: disc brakes on a 1970 longhorn
This reply is specifically for Tim. How do you know about this truck? The pic of the metal data plate is correct. As is the none factory green paint. I bought this as a parts truck. No front clip, no motor or tranny, no steering box or seat. It did have some Custom Camper 20 emblems that where left in it. I bought this for the Dana 60, to swap out the Eaton with 4:10 gears in mine. The Dana has 3:54 gears. Anyone want a 4:10 Eaton cheap? I'll try to post some pics. of the disc brake set up soon. Looks factory to me. Any thing is possable with these trucks.
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#10 |
Senior Member
![]() Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: disc brakes on a 1970 longhorn
What size are the lug bolts front and rear? Do they match in size front to rear? My understanding is the drum brake trucks had one size (I forget, 1/2"?) and when GM went to disc brakes in the front, the lugs were upgraded as well (9/16"?) I have a 70 Longhorn with 4 wheel drums. I was thinking of swapping a 72 disc brake front crossmember into it and when I was looking at it, I realized hat the lugs on the 72 disc rotors were larger than the lugs on the 70 drums. I didn't want to have two different size lug nuts. Not too big of a deal , though as I also have a Dana 60 out of a 72 C20.
I already have a similar situation with my 79 Malibu (originally English standard thread lugs). I swapped in a larger 8.5" rear out of a 80's 442 which had metric lugs. I could swap the rotors, but I have actually been saving up to buy the spindles necessary to perform a B body (Caprice) spindle swap and Camaro 1LE rotors. for the time being I have to watch the tire monkeys if I go to hav etires mounted, etc and remind them not to mix up the lug nuts, and let them know they will need a different size socket front to rear. |
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#11 |
Registered User
![]() Join Date: Oct 2012
Location: oran,mo.
Posts: 171
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Re: disc brakes on a 1970 longhorn
kind off looks like he smaller drum brake master cylinder, hard to get a good look at it
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#12 |
Registered User
![]() Join Date: Sep 2007
Location: Rufus Oregon
Posts: 1,187
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Re: disc brakes on a 1970 longhorn
The vacuum booster and master cyclinder I think where thrown in the truck. The kid I bought it from, put a bunch of scrape parts in the back of the truck, this was part of that. He used a bunch of parts on his own truck, that's where the front sheet metal went. One person did reply earlier if this had two size lug nuts, it does. My project '71 Longhorn also has two different size lug nuts, as well as the spare Dana 60 in the back of my Longhorn. Any thought on this? Why did G.M. use two different sizes?
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#13 |
Cool Truck
Join Date: Dec 2008
Location: Bowie,MD
Posts: 1,869
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Re: disc brakes on a 1970 longhorn
I would think this is a conversion. 67-70 used 1/2 inch studs while 71-72 used 9/16 inch studs. I know that disc brakes widened the track width, and from your pictures it almost appears to me as if the front tires are out further than the rears are. I would think if it was disc brakes from the factory, it would have the wider rear end to match the front. Plus, seeing as it has been repainted and had an engine swap, somebody was already doing work to this truck so they could have upgraded to discs while they were at it.
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1968 Chevrolet C20 Longhorn "Cool Truck" 1937 Chevrolet Pickup - Project Looking for a patina'd 68 50th Anniversary longbed |
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#14 |
Active Member
![]() Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: disc brakes on a 1970 longhorn
As I have mentioned before, these old vehicles were being messed with by mechanics many years ago -probably more so than now. In the old days cars and trucks had more interchangeable parts than they do now with everything computerized.
I've been swapping things out on old cars and trucks since I was 18 years old back in the 60's. We converted a truck to discs back in 1980. That's over 30 years ago. Lots of dirt and grime accumulates on them in a short time.
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68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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#15 | |
Senior Member
![]() Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: disc brakes on a 1970 longhorn
Quote:
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#16 | |
Active Member
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Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,947
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Re: disc brakes on a 1970 longhorn
Quote:
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__________________
68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive... |
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#17 | |
Senior Member
![]() Join Date: Aug 2008
Location: Cedar Park, Texas
Posts: 7,500
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Re: disc brakes on a 1970 longhorn
Quote:
As I stated above -------------------------------------------------------------------------------- What size are the lug bolts front and rear? Do they match in size front to rear? My understanding is the drum brake trucks had one size (I forget, 1/2"?) and when GM went to disc brakes in the front, the lugs were upgraded as well (9/16"?) |
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#18 |
6>8 Plugless........
![]() Join Date: Sep 2007
Location: Prairie City, Ia
Posts: 17,140
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Re: disc brakes on a 1970 longhorn
I wouldn't say any of this is impossible. I once owned a 70 Camaro that was produced 5/69. But clearly was stated as a 70. Go figure.
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Ryan 1972 Chevy Longhorn K30 Cheyenne Super, 359 Inline 6 cylinder, Auto Trans, Tilt, Diesel Tach/Vach, Buckets, Rare Rear 4-link and air ride option Build Thread 1972 GMC Sierra Grande Longhorn 4x4 1972 Chevy Cheyenne Super K20 Long Step side tilt, tach, tow hooks, AC, 350 4 speed 1972 C10 Suburban Custom Deluxe 1969 Chevy milk truck 1971 Camaro RS 5.3 BTR STG3 Cam Super T10 1940 Ford 354 Hemi 46RH Ford 9" on air ride huge project Tired of spark plugs? Check this out. |
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#19 |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: disc brakes on a 1970 longhorn
Interesting, was it VIN numbered as a '70? They had a lot of issues with the late '69 production run. Most people know the story of the strikes causing the late run but in fact it was the drawing dies Fisher Body made for the quarter panels, they didn't work! The cars were made through November of '69 and still being made in the calender year were legal as '69s and MSOed as such but a number of people have them titled as '70s.
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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#20 | |
Registered User
Join Date: Aug 2010
Location: Edwards, CA
Posts: 7,503
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Re: disc brakes on a 1970 longhorn
Quote:
But something I am seeing here is the rear axle width question. Its established fact that the 1/2 tons had a running change as a current post so graphicly shows. But did the large C20 or C30 trucks have a running change as well? Maybe the hubs or housings but that seems like a lot of expense. So can anyone nail down a documented track width change?
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Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID ** Blazer SPID ** Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders ** Do you have a 1972 Plaid Pickup? ** Plaid Blazer ** Plaid Suburban |
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