what are the differences in rad supports? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

**passthebuck** · 01-01-2005, 12:10 PM

Hey all. I'm wondering about what the differences in radiator supports for our trucks - years vs. gmc/chey? i am in need of one for my 67gmc & i'm noticing that chevy is super common. thank you for your advice!

67ChevyRedneck · 01-01-2005, 12:38 PM

What does a GMC one look like? I'm pretty sure they are all the same on Chevys. I have a '67 and my grandpa has a '72, they look the same to me. Some had wider radiators than others and all you have to do is slide one of the supports over to the next set of holes in the rad. support.

Robert1970C20rstbukt · 01-01-2005, 12:51 PM

The GMC rad supports have 4 headlight buckets, 2 on each side. All the Chevy's have two headlight buckets, one on each side.

zeeklu · 01-01-2005, 12:57 PM

67 and 68 Chevy headlight position and 69-72 are slightly different. Chris

67ChevyRedneck · 01-01-2005, 01:12 PM

HAHA, I TOTALLY READ THAT QUESTION WRONG!! I thought you meant the little metal brackets with the rubber that hold the radiator in!!! Ok, on a Chevy the 67-68 supports are a good bit different than the 69-72. Like zeeklu said the headlight mounting is different. Someone else posted how you could modifiy a chevy rad. support to fit a gmc as long as you have the gmc headlight buckets....anyone know where it is??

**passthebuck** · 01-01-2005, 08:36 PM

this is the conversion post:

http://67-72chevytrucks.com/vboard/s...diator+support

but i was more wondering what else is different other than the four headlight buckets? Is there a diffinitive (sp?) conversion method? Are all the bolt holes there?

*Gee_Emm* · 01-01-2005, 08:50 PM

I dont know about 67-68's but the 69-72 Chev and GMC's are the same.

**JIMs70GMC** · 01-01-2005, 11:08 PM

The 67-68 also have captive nuts along the bottom front for a stone guard. My 71 had a chevy core support w/ gmc buckets bolted on. All the holes for the wiring were there, no difference. I've since replaced it with a core support from my 72 C30 and used the gmc wiring harness, just had to cut off the extra headlight leads.

HOTFUN · 01-01-2005, 11:32 PM

I am going the other direction on my 67 Chevy. My 60k mile donor 67 GMC Custom is absolutely rust free original paint so I plan to take the core support and front clip from it. The headlight buckets that are tack welded on are the only difference when you lay them side by side. I plan to drill out the 12 spotwelds on each GMC bucket and remove them. The original Chevy head light mounts are all stamped in the support behind the dual GMC mount brackets.

Mark

**passthebuck** · 01-04-2005, 02:13 AM

sweet. So i dont just have to limit my search to gmc's for a less rusty core support. thanx for the info

01-01-2005, 12:10 PM	#1
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	what are the differences in rad supports? Hey all. I'm wondering about what the differences in radiator supports for our trucks - years vs. gmc/chey? i am in need of one for my 67gmc & i'm noticing that chevy is super common. thank you for your advice! __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

01-01-2005, 12:38 PM	#2
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	What does a GMC one look like? I'm pretty sure they are all the same on Chevys. I have a '67 and my grandpa has a '72, they look the same to me. Some had wider radiators than others and all you have to do is slide one of the supports over to the next set of holes in the rad. support. __________________ 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!

01-01-2005, 12:51 PM	#3
Robert1970C20rstbukt Registered User Join Date: Jun 2004 Location: Beeville, Texas Posts: 1,943	The GMC rad supports have 4 headlight buckets, 2 on each side. All the Chevy's have two headlight buckets, one on each side. __________________ RJD 1984 Chevrolet C30 welding truck 454/SM465 1977 GMC C15 pickup 350/TH350 1970 Chevrolet C20 pickup 350/TH400 1970 Chevrolet K20 Suburban 454/TH350 1969 GMC 8500 478M V6/5 spd winch truck

01-01-2005, 01:12 PM	#5
67ChevyRedneck Hittin E-Z Street on Mud Tires Join Date: Nov 2004 Location: Greenville, SC Posts: 23,090	HAHA, I TOTALLY READ THAT QUESTION WRONG!! I thought you meant the little metal brackets with the rubber that hold the radiator in!!! Ok, on a Chevy the 67-68 supports are a good bit different than the 69-72. Like zeeklu said the headlight mounting is different. Someone else posted how you could modifiy a chevy rad. support to fit a gmc as long as you have the gmc headlight buckets....anyone know where it is?? __________________ 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!

01-01-2005, 08:36 PM	#6
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	this is the conversion post: http://67-72chevytrucks.com/vboard/s...diator+support but i was more wondering what else is different other than the four headlight buckets? Is there a diffinitive (sp?) conversion method? Are all the bolt holes there? __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

01-01-2005, 12:57 PM	#4
zeeklu Registered User Join Date: Dec 1999 Location: Northwest NJ Posts: 746	67 and 68 Chevy headlight position and 69-72 are slightly different. Chris

01-01-2005, 08:50 PM	#7
Gee_Emm Account Suspended Join Date: Sep 2000 Posts: 3,991	I dont know about 67-68's but the 69-72 Chev and GMC's are the same.

01-01-2005, 11:08 PM	#8
JIMs70GMC user # 2756 Join Date: Jun 2001 Location: Chesapeake, Virginia Posts: 4,612	The 67-68 also have captive nuts along the bottom front for a stone guard. My 71 had a chevy core support w/ gmc buckets bolted on. All the holes for the wiring were there, no difference. I've since replaced it with a core support from my 72 C30 and used the gmc wiring harness, just had to cut off the extra headlight leads. __________________ 1970 K25, 8' stepside bed 350/465/205 44 up front, 60 in the rear 4.10s rolling on 33" Dunlop MTs 1986 K5, 350/465/208 Dana 60/14 bolt from a cucv 36" Super Swampers TSL/SX 1983 K20 w/ CUCV axles, 350/700R4/208 sitting on 37" Goodyears 1986 M1031 6.2 diesel, TH400/NP205 locker in the rear and a LS in the front, all stock for now..... 1986 K30, 350/400/205 dana 60 and 14 bolt. I kept the drivetrain. Body/bad and chassis are gone. 1981 K30, 350/465/205 dana 60 and dually 14 bolt. Has a G80, and a flat bed. Going to replace the flat bed. 1985 K20, 350/400/208 10 bolt and SF 14 bolt. I wonder where I can find some 1 tons. Hmmmmm

01-01-2005, 11:32 PM	#9
HOTFUN Registered User Join Date: Jan 2001 Location: Lincoln, Nebraska Posts: 2,145	I am going the other direction on my 67 Chevy. My 60k mile donor 67 GMC Custom is absolutely rust free original paint so I plan to take the core support and front clip from it. The headlight buckets that are tack welded on are the only difference when you lay them side by side. I plan to drill out the 12 spotwelds on each GMC bucket and remove them. The original Chevy head light mounts are all stamped in the support behind the dual GMC mount brackets. Mark __________________ '66 CST BBW swb fleet 327 fac ac '67 CST 4x4 swb 327 stepside project '72 Cheyenne K20 50k original '72 Cheyenne Super K20 project '73 Sierra swb 4x4 frame off in paint stage '74 Cheyenne Super swb w/16k actual '71 & 72 Cheyenne K10 4x4 swb's '70 426 HEMICUDA conv SHAKER 4 sp Dana 60 '60 Impala conv 327 PG fac ac loaded 3rd owner '72 GMC K2500 4x4 '59 Apache CST BBW fleetside swb 283 '73 ElCamino SS LS1 T56 true SS bucket tach '76 ElCamino SS 52k survivor '87 Grand National 41k True 2nd to last built in 1987. '86 K30 454 SRW fleetside CA since new '88 Trans Am GTA 39k bought new 2018 DEMON plum crazy @ 840HP! "Need for speed" Last edited by HOTFUN; 01-01-2005 at 11:36 PM.

01-04-2005, 02:13 AM	#10
passthebuck Sisyphus was my mentor! Join Date: Sep 2002 Location: Carleton Place, Ontario CANADA Posts: 984	sweet. So i dont just have to limit my search to gmc's for a less rusty core support. thanx for the info __________________ passthebuck #5642 -TWO 1967 GMC 910's. One with L6/3-on-the tree and the other with 355 w/435hp & a 700r4. -a 2013 Honda Civic as my "sensible" car

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