GMC 3/4 cab mounts the same as 1/2 Chevy? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

siggyfreud · 11-04-2014, 05:06 PM

Hey all,

Looking to purchase some new cab mounts for my 66 GMC 3/4 Ton. Looks at mounts readily available online, they appear to be for the 63-66 Chevy 1/2 ton, and 3/4 ton have different frame mounts thus they take different mounting hardware. However, from looking at photos my rear cab mounts appear to be the same as the 1/2 style, which made me wonder if the GMCs used the 1/2 mounts across their range.

In that photo you can see what my rear mounts look like. Would I be good to go with the standard 1/2 mount kit?

Cheers all!

jonzcustomshop · 11-04-2014, 07:17 PM

hard to say for sure but the one 64 gmc 3/4 ton I have has the chevy 1/2 ton style mounts , not the vulcanized mounts like a 3/4 ton chev....

sodly · 11-04-2014, 11:31 PM

Wow... this is news to me. Can anyone else confirm non-rubber rear mounts on their GMC 3/4 tons? Sure they haven't been modified over the years? That's pretty strange, if you ask me.

LT1 Burb · 11-04-2014, 11:45 PM

Are they riveted on or bolted?

siggyfreud · 11-04-2014, 11:46 PM

I just recall the mounting brackets for te 3/4 ton looking differently in diagrams. The rears in the photo above look like 1/2 ton to me. They're riveted on, but cant be 100% it's factory. Looks factory though.

Are you saying the mounts in the photo shouldn't have come on a 3/4 ton?

I can't remember what the actual mounting material looked like unfortunately.

**60-66** · 11-05-2014, 12:44 PM

I have a GMC 1/2 ton and a GMC both 66s sitting side by side and they have the exact same mounts for the frame and cushions, same height and shape.

jhrusk · 11-05-2014, 04:39 PM

I had a 66 Chevy 3/4 ton and the rear mounts were different than the 1/2 ton, kinda weird looking setup.

LT1 Burb · 11-05-2014, 08:19 PM

PS, I want to warn you about that fuel line you are running. I ran Russell steel braided fuel line for my LT1 and I had to take it all off after 3-4 years and throw it away. The fuel actually weeped through the lines over time and soaked the frame the whole length. I had to move the truck outside because the garage and house stunk of gas. I redid it in aluminum and had no more problem. I don't know if it was a bad run of line or if the fuel nowadays eats the rubber.

rickywideglide · 11-05-2014, 08:26 PM

thats strange the rear mounts would be different between 3/4 ton gmcs and chevys,my 3/4 ton has sheer type with vulcanized rubber.. anyone know why,was it a comfort thing more cushioning?

padresag · 11-05-2014, 08:37 PM

Quote:

Originally Posted by siggyfreud

Hey all,

Looking to purchase some new cab mounts for my 66 GMC 3/4 Ton. Looks at mounts readily available online, they appear to be for the 63-66 Chevy 1/2 ton, and 3/4 ton have different frame mounts thus they take different mounting hardware. However, from looking at photos my rear cab mounts appear to be the same as the 1/2 style, which made me wonder if the GMCs used the 1/2 mounts across their range.

In that photo you can see what my rear mounts look like. Would I be good to go with the standard 1/2 mount kit?

Cheers all!

that does look like the right rear mount for the 1/2t insulators
ron

siggyfreud · 11-05-2014, 09:06 PM

Quote:

Originally Posted by LT1 Burb

PS, I want to warn you about that fuel line you are running. I ran Russell steel braided fuel line for my LT1 and I had to take it all off after 3-4 years and throw it away. The fuel actually weeped through the lines over time and soaked the frame the whole length. I had to move the truck outside because the garage and house stunk of gas. I redid it in aluminum and had no more problem. I don't know if it was a bad run of line or if the fuel nowadays eats the rubber.

Thanks for the heads up. I'll definitely keep an eye on it. They should be ethanol safe by now but I'll send a note to summit and see.

So it sounds like I should be good with 1/2 ton mounts. Thanks all!

Bears63 · 11-06-2014, 12:02 AM

RickyWideGlide, I think the comfort issue was the entire thing. The rear mounts on the 3/4 ton Chevy's do absorb more vibration and such, but I have never seen that it was enough to make a whole lot of difference. They are just plain rough trucks anyway

sdwolff98 · 11-16-2014, 02:13 AM

I can confirm the 1/2 chevy mounts are the ones used on my 64 gmc 3/4 ton.

Sean

creep · 11-16-2014, 10:55 AM

My 63 GMC 3/4 ton had the same rear cab mounts as the Chevy 3/4 ton mounts. They were pretty jacked so I replaced with 1/2 ton mounts.

Before...

After...

11-04-2014, 05:06 PM	#1
siggyfreud Registered User Join Date: Jun 2012 Location: Portland Posts: 1,330	GMC 3/4 cab mounts the same as 1/2 Chevy? Hey all, Looking to purchase some new cab mounts for my 66 GMC 3/4 Ton. Looks at mounts readily available online, they appear to be for the 63-66 Chevy 1/2 ton, and 3/4 ton have different frame mounts thus they take different mounting hardware. However, from looking at photos my rear cab mounts appear to be the same as the 1/2 style, which made me wonder if the GMCs used the 1/2 mounts across their range. In that photo you can see what my rear mounts look like. Would I be good to go with the standard 1/2 mount kit? Cheers all! __________________ Current Build - Project "Ghost of Poseidon" 72 C10 Pro-touring build Previous Build - 66 GMC Pro-touring build. Sold.

11-04-2014, 07:17 PM	#2
jonzcustomshop 1961 crewcab Join Date: Dec 2007 Location: missoula, mt Posts: 6,164	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? hard to say for sure but the one 64 gmc 3/4 ton I have has the chevy 1/2 ton style mounts , not the vulcanized mounts like a 3/4 ton chev.... __________________ 60 build: http://67-72chevytrucks.com/vboard/s...d.php?t=280904 61 crew build: http://67-72chevytrucks.com/vboard/s...d.php?t=646830 63 build: http://67-72chevytrucks.com/vboard/s...d.php?t=336537 64 'burb build: http://67-72chevytrucks.com/vboard/s...d.php?t=448681 65 'burb build: http://67-72chevytrucks.com/vboard/s...d.php?t=590715 65 build: http://67-72chevytrucks.com/vboard/s...d.php?t=281955

11-04-2014, 11:31 PM	#3
sodly Registered User Join Date: Nov 2009 Location: Nebraska Posts: 1,034	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? Wow... this is news to me. Can anyone else confirm non-rubber rear mounts on their GMC 3/4 tons? Sure they haven't been modified over the years? That's pretty strange, if you ask me. __________________ WANTED: * 60-66 Chevy and GMC FACTORY PHOTOGRAPHY (scans) of pickups and carryalls. *Custom Camper Club*-- Own a 65-66 Custom Camper? Join us at: http://67-72chevytrucks.com/vboard/g...hp?groupid=117

11-04-2014, 11:45 PM	#4
LT1 Burb Registered User Join Date: Sep 2010 Location: Winchester Oregon, formerly Vancouver BC Posts: 2,949	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? Are they riveted on or bolted?

11-04-2014, 11:46 PM	#5
siggyfreud Registered User Join Date: Jun 2012 Location: Portland Posts: 1,330	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? I just recall the mounting brackets for te 3/4 ton looking differently in diagrams. The rears in the photo above look like 1/2 ton to me. They're riveted on, but cant be 100% it's factory. Looks factory though. Are you saying the mounts in the photo shouldn't have come on a 3/4 ton? I can't remember what the actual mounting material looked like unfortunately. __________________ Current Build - Project "Ghost of Poseidon" 72 C10 Pro-touring build Previous Build - 66 GMC Pro-touring build. Sold.

11-05-2014, 12:44 PM	#6
60-66 Registered User Join Date: Apr 2012 Location: Wisconsin Posts: 3,329	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? I have a GMC 1/2 ton and a GMC both 66s sitting side by side and they have the exact same mounts for the frame and cushions, same height and shape. __________________ IS IT an EATON or Chevrolet rear axle https://67-72chevytrucks.com/vboard/...d.php?t=843778 The hubcap thread http://67-72chevytrucks.com/vboard/s...d.php?t=702839 WANTED : 1963-1966 6 Cylinder Fan Shroud WANTED :1964-1966 PANEL TRUCK

11-05-2014, 04:39 PM	#7
jhrusk Registered User Join Date: Nov 2011 Location: mid ga Posts: 553	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? I had a 66 Chevy 3/4 ton and the rear mounts were different than the 1/2 ton, kinda weird looking setup. __________________ check out SANFORD build thread http://67-72chevytrucks.com/vboard/s...d.php?t=522019

11-05-2014, 08:19 PM	#8
LT1 Burb Registered User Join Date: Sep 2010 Location: Winchester Oregon, formerly Vancouver BC Posts: 2,949	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? PS, I want to warn you about that fuel line you are running. I ran Russell steel braided fuel line for my LT1 and I had to take it all off after 3-4 years and throw it away. The fuel actually weeped through the lines over time and soaked the frame the whole length. I had to move the truck outside because the garage and house stunk of gas. I redid it in aluminum and had no more problem. I don't know if it was a bad run of line or if the fuel nowadays eats the rubber.

11-05-2014, 08:26 PM	#9
rickywideglide Registered User Join Date: Jun 2013 Location: mechanicsville,md Posts: 360	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? thats strange the rear mounts would be different between 3/4 ton gmcs and chevys,my 3/4 ton has sheer type with vulcanized rubber.. anyone know why,was it a comfort thing more cushioning?

11-06-2014, 12:02 AM	#12
Bears63 ...just another truck junkie.. Join Date: May 2009 Location: Watertown, SD Posts: 698	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? RickyWideGlide, I think the comfort issue was the entire thing. The rear mounts on the 3/4 ton Chevy's do absorb more vibration and such, but I have never seen that it was enough to make a whole lot of difference. They are just plain rough trucks anyway __________________ Mike "Bear" Shea

11-16-2014, 02:13 AM	#13
sdwolff98 Turning Wrenches Daily Join Date: Sep 2003 Location: Gladewater Texas Posts: 1,129	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? I can confirm the 1/2 chevy mounts are the ones used on my 64 gmc 3/4 ton. Sean Attached Images __________________ Work! Play! Work work work! Money to play with. 64 GMC, 66 burb 4x4, and now 64 1ton money pits......ahhh life is good. Upcoming move back to Texas Dallas bound we are this september!!! 1964 GMC I1500 2wd (my baby) 8.1 allison 6 spd conversion Aka Smurf http://67-72chevytrucks.com/vboard/s...d.php?t=438342 2016 Ram Big Horn 4WD parts hauler 2010 Chevy HHR wife new car after the circled problem blew up!!! 1981 Ram D150 /6 auto Wife's sunday driver Living outside Gladewater Texas now working in Longview at the hospital there future project toys: 1966 Chevy K14 carryall aka Smurfette future project 283/auto overdrive http://67-72chevytrucks.com/vboard/s...d.php?t=551867

11-16-2014, 10:55 AM	#14
creep Registered Loser Join Date: Jun 2009 Location: Elyria, OH Posts: 1,523	Re: GMC 3/4 cab mounts the same as 1/2 Chevy? My 63 GMC 3/4 ton had the same rear cab mounts as the Chevy 3/4 ton mounts. They were pretty jacked so I replaced with 1/2 ton mounts. Before... After... __________________ ((..)) ((0)) '63 GMC lwb, 383, th350, lays frame, genuine patina. The Build Thread - http://67-72chevytrucks.com/vboard/s...d.php?t=374267 '88 Astro cargo bagged, shaved, phantom grille. SOLD '50 Chevy 2 door sedan awaiting attention. 2014 Silverado Ext cab, 5.3, daily driver.

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