crossmember bolt size(s)? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

dmartin1 · 02-03-2014, 10:08 PM

my truck didnt really come with bolts in the front suspension.all mixed matches and rusted gone.

does anyone know the right size/pitch(if it even matters) for bolting the front crossmember to the frame?

it would be awesome!

hugger6933 · 02-03-2014, 10:19 PM

Medium. No just kidding, 3/8 course threads I think? Well the course I know is right I think part is the 3/8 bolt size. Jim

dmartin1 · 02-04-2014, 05:10 PM

anyone know the length and or pitch?
wanna make sure i get the bolts to suffice

or am i over thinking this?lol

Zable49 · 02-04-2014, 05:51 PM

I have mine sitting on the garage floor right now, so as soon as I get home from work I will take a look for ya. (Unless someone answers prior to me getting home).

67c10rustbuket · 02-04-2014, 06:48 PM

What year truck ? I don't see a 67-72 in your sig.

A 67-72 C10 uses 7/16-14 x 1.5" (fourteen bolts). Could be shorter but that's what the general used.

Zable49 · 02-04-2014, 07:59 PM

So double checked for a c20 and they are the same as c10. So Dan (67c10rustbucket) is correct. Oh and make sure you use all grade 8 hardware when you replace.

dmartin1 · 02-07-2014, 12:14 PM

its a 69 shortbed. excellent, thanks a million now i can bolt the sucker back together

66skylarkpost · 02-07-2014, 03:14 PM

there are a total of 14 bolts. there's 6 - 1/2" bolts with unique "squared" flat washers with lock washers and nuts that go vertical thru the inside of the frame having the nuts in the frame . 4- 7/16" with a unique flat washers and a lock washer that thread from the inside of the frame. and then 4- 7/16" bolts with just lock washers and nuts that go so the nuts are outside of the frame

02-03-2014, 10:08 PM	#1
dmartin1 Registered User Join Date: Aug 2008 Location: mohave valley,arizona Posts: 1,088	crossmember bolt size(s)? my truck didnt really come with bolts in the front suspension.all mixed matches and rusted gone. does anyone know the right size/pitch(if it even matters) for bolting the front crossmember to the frame? it would be awesome! __________________ 1969 Shortbed in progress 1982 short step, few suspension and motor upgrades.getting a 468 1978 Shortbed fleet side bonanza fully loaded 1978 k20 Silverado loaded.currently engine-less 1989 k10 suburban 9" lift 65 nova And more

02-03-2014, 10:19 PM	#2
hugger6933 Registered User Join Date: Oct 2008 Location: Marianna Arkansas Posts: 7,263	Re: crossmember bolt size(s)? Medium. No just kidding, 3/8 course threads I think? Well the course I know is right I think part is the 3/8 bolt size. Jim

02-04-2014, 05:10 PM	#3
dmartin1 Registered User Join Date: Aug 2008 Location: mohave valley,arizona Posts: 1,088	Re: crossmember bolt size(s)? anyone know the length and or pitch? wanna make sure i get the bolts to suffice or am i over thinking this?lol __________________ 1969 Shortbed in progress 1982 short step, few suspension and motor upgrades.getting a 468 1978 Shortbed fleet side bonanza fully loaded 1978 k20 Silverado loaded.currently engine-less 1989 k10 suburban 9" lift 65 nova And more

02-04-2014, 05:51 PM	#4
Zable49 Registered User Join Date: Jun 2007 Location: Lacey, Wa Posts: 181	Re: crossmember bolt size(s)? I have mine sitting on the garage floor right now, so as soon as I get home from work I will take a look for ya. (Unless someone answers prior to me getting home). __________________ 1970 C20 Camper Special SBC350 / TH350 '84 C20 Front Disc Brakes/Control Arms

02-04-2014, 06:48 PM	#5
67c10rustbuket Registered User Join Date: Apr 2011 Location: Mustang, Oklahoma Posts: 2,806	Re: crossmember bolt size(s)? What year truck ? I don't see a 67-72 in your sig. A 67-72 C10 uses 7/16-14 x 1.5" (fourteen bolts). Could be shorter but that's what the general used. __________________ Dan <---(my name) 67 SWB C10 project "GEORGIA"-59 Brookwood 2dr wag...Next project-03 Tahoe 4x4 5.3 family ride-07 Hondur Accord, commuter car

02-04-2014, 07:59 PM	#6
Zable49 Registered User Join Date: Jun 2007 Location: Lacey, Wa Posts: 181	Re: crossmember bolt size(s)? So double checked for a c20 and they are the same as c10. So Dan (67c10rustbucket) is correct. Oh and make sure you use all grade 8 hardware when you replace. __________________ 1970 C20 Camper Special SBC350 / TH350 '84 C20 Front Disc Brakes/Control Arms

02-07-2014, 12:14 PM	#7
dmartin1 Registered User Join Date: Aug 2008 Location: mohave valley,arizona Posts: 1,088	Re: crossmember bolt size(s)? its a 69 shortbed. excellent, thanks a million now i can bolt the sucker back together __________________ 1969 Shortbed in progress 1982 short step, few suspension and motor upgrades.getting a 468 1978 Shortbed fleet side bonanza fully loaded 1978 k20 Silverado loaded.currently engine-less 1989 k10 suburban 9" lift 65 nova And more

02-07-2014, 03:14 PM	#8
66skylarkpost Registered User Join Date: Mar 2006 Location: kearney,nebraska Posts: 443	Re: crossmember bolt size(s)? there are a total of 14 bolts. there's 6 - 1/2" bolts with unique "squared" flat washers with lock washers and nuts that go vertical thru the inside of the frame having the nuts in the frame . 4- 7/16" with a unique flat washers and a lock washer that thread from the inside of the frame. and then 4- 7/16" bolts with just lock washers and nuts that go so the nuts are outside of the frame Attached Images __________________ '70 k-10 longbox- mid 70's drivetrain 350/350 487x heads 10.1:1 flowmasters ,35's 3.73's auburn posi ,rear shackle flip. '72 short stepside U.S. forestry truck, '73 455 buick,400 turbo,dropped 2"-4 1/4" ,3.07 posi,:'89 silverado 1500 ,OK truck ,5.7 holley tbi ,trick 700r4 3.07 auburn posi ,and my '66 skylark ,'73 centurion and my '84 monte carlo imca stock car Last edited by 66skylarkpost; 02-07-2014 at 03:37 PM.



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