c20 and c10 notch the same? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cochino12 · 08-20-2015, 10:59 PM

I'm having trouble finding a notch for my c20, are they the same as the c10? Thanks

**N2TRUX** · 08-21-2015, 11:42 AM

Adam I have always been told that the C/10 and C/20 frame is the same. The C/30 is larger. Have a tried asking the manufacturers?

slimneverdies · 08-21-2015, 12:33 PM

I just took my 78 c20 and my 78 c30 off their frames and they look the same. Don't have a c10 frame to compare it to but I need the answer also...

SCOTI · 08-21-2015, 11:29 PM

Rails are similar but the C10 notch is for a 3" OD axle tube. C20's & C30's are ~4" OD so the notch openings are different.

FYI, Western Chassis makes a C20/30 c-notch but it's <2" @ the top of the notch which = significant reduction of frame rail strength (a concern especially if still using leafs). I bought some & once I saw that 2" dimension they were tossed. Instead, I bought step notches from Porterbuilt to maintain strength. Ironically..... PB's step notch set-up was about the same price.

slimneverdies · 08-21-2015, 11:46 PM

Quote:

Originally Posted by SCOTI

Rails are similar but the C10 notch is for a 3" OD axle tube. C20's & C30's are ~4" OD so the notch openings are different.

FYI, Western Chassis makes a C20/30 c-notch but it's <2" @ the top of the notch which = significant reduction of frame rail strength (a concern especially if still using leafs). I bought some & once I saw that 2" dimension they were tossed. Instead, I bought step notches from Porterbuilt to maintain strength. Ironically..... PB's step notch set-up was about the same price.

Would you happen to know how wide the top of the frame rails are back in that area?

SCOTI · 08-22-2015, 12:05 PM

3"W x approx 4.5"H

cochino12 · 08-26-2015, 08:36 PM

Thanks for the help guys.

So I spoke with Western Chassis and their tech guy really didnt sound very confident the c20 notch was any different than the c10.

I'm converting this truck to 1/2 ton so I'm hoping the bolt in notch will work.

SCOTI · 08-26-2015, 10:35 PM

Quote:

Originally Posted by cochino12

Thanks for the help guys.

So I spoke with Western Chassis and their tech guy really didnt sound very confident the c20 notch was any different than the c10.

I'm converting this truck to 1/2 ton so I'm hoping the bolt in notch will work.

I've had both (C10 & C30) c-notches from Western Chassis. The difference was the notched opening. The C10 version was round. The C30 version was flat-plate bent @ 45` angles w/a 4" top section.

08-20-2015, 10:59 PM	#1
cochino12 It followed me home? Join Date: Mar 2003 Location: Yup Posts: 5,751	c20 and c10 notch the same? I'm having trouble finding a notch for my c20, are they the same as the c10? Thanks __________________ Adam That's why they call it a shortcut Kyle, if it was easy it would just be the way. 86 c-10 SWB 85 CCSB 90 GMC K30 Crew SRW 1985 C30 Dually

08-21-2015, 11:42 AM	#2
N2TRUX Happy to be here Join Date: Mar 2000 Location: Cypress, TX Posts: 39,021	Re: c20 and c10 notch the same? Adam I have always been told that the C/10 and C/20 frame is the same. The C/30 is larger. Have a tried asking the manufacturers? __________________ Follow me on Facebook and Instagram @N2trux.com Articles- "Jake" the 84 to 74 crewcab "Elwood" the77_Remix 85 GMC Sierra "Scarlett" "Refining Sierra"

08-21-2015, 12:33 PM	#3
slimneverdies Registered User Join Date: Apr 2006 Location: Miami now in Vegas Posts: 828	Re: c20 and c10 notch the same? I just took my 78 c20 and my 78 c30 off their frames and they look the same. Don't have a c10 frame to compare it to but I need the answer also... __________________ Long live SLIM ------------------ At least try to buy American

08-21-2015, 11:29 PM	#4
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,064	Re: c20 and c10 notch the same? Rails are similar but the C10 notch is for a 3" OD axle tube. C20's & C30's are ~4" OD so the notch openings are different. FYI, Western Chassis makes a C20/30 c-notch but it's <2" @ the top of the notch which = significant reduction of frame rail strength (a concern especially if still using leafs). I bought some & once I saw that 2" dimension they were tossed. Instead, I bought step notches from Porterbuilt to maintain strength. Ironically..... PB's step notch set-up was about the same price. __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

08-22-2015, 12:05 PM	#6
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,064	Re: c20 and c10 notch the same? 3"W x approx 4.5"H __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

08-26-2015, 08:36 PM	#7
cochino12 It followed me home? Join Date: Mar 2003 Location: Yup Posts: 5,751	Re: c20 and c10 notch the same? Thanks for the help guys. So I spoke with Western Chassis and their tech guy really didnt sound very confident the c20 notch was any different than the c10. I'm converting this truck to 1/2 ton so I'm hoping the bolt in notch will work. __________________ Adam That's why they call it a shortcut Kyle, if it was easy it would just be the way. 86 c-10 SWB 85 CCSB 90 GMC K30 Crew SRW 1985 C30 Dually

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