1967 C40 Rear Axle Rating? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Transam461 · 09-01-2020, 11:28 PM

Good evening everyone, I am working on a 1967 Chevrolet C40, and I need to replace a bad power brake booster, which is mounted under the cab. They want to know what rating the Rear Axle is in it, so I need your help. It is a 1967 C40, L6 292 engine, single rear axle with duals. The tag inside the drivers door jam says the truck is rated 16,000 lb GVWR. The tag that is inside the glove box says it is a Model CS41403, and I also see that it says "RR Spring 15,000 lb" on the tag, but I wasn't sure if this was refering to the Rear Axle rating or not, as I wasnt sure what the "RR" stands for. Can someone help me? What is the rating of the Rear Axle in this truck? Thank You

Brian

**special-K** · 09-03-2020, 07:34 AM

I rambled some on this question in your original thread. Does your truck have the SPID on the glovebox door?

http://67-72chevytrucks.com/vboard/s...d.php?t=811411

**CarolinaHD** · 09-08-2020, 08:16 AM

Post a pic of the rear axle, it's either 11k, 13.5k, or 15k pound rear. It's more than likely you have the upgraded 5k front axle with the 11k rear=16k gvwr. I'm not postive what RR stands for but something to do with the rear. 7.5k leaf spring option is the 15k rr springs on your spid

**MJN** · 09-08-2020, 01:20 PM

RR is simply the abbreviation for Rear

**CarolinaHD** · 09-08-2020, 02:31 PM

Thanks! Ive always wondered, I assume they use FF for front?

**MJN** · 09-08-2020, 03:08 PM

Quote:

Originally Posted by CarolinaHD

Thanks! Ive always wondered, I assume they use FF for front?

FRT is front

rkn463 · 09-09-2020, 01:02 PM

I think the rear diff will have numbers stamped in to it, can you find those?

**special-K** · 09-30-2020, 08:39 PM

What you'll have is an HO110. All I know is the minimum factory rating is at 11k# and that is an option on the 1t (light truck configuration. Rating up from there depends on spring options

09-01-2020, 11:28 PM	#1
Transam461 Registered User Join Date: Jan 2016 Location: Cape Fair, MO Posts: 10	1967 C40 Rear Axle Rating? Good evening everyone, I am working on a 1967 Chevrolet C40, and I need to replace a bad power brake booster, which is mounted under the cab. They want to know what rating the Rear Axle is in it, so I need your help. It is a 1967 C40, L6 292 engine, single rear axle with duals. The tag inside the drivers door jam says the truck is rated 16,000 lb GVWR. The tag that is inside the glove box says it is a Model CS41403, and I also see that it says "RR Spring 15,000 lb" on the tag, but I wasn't sure if this was refering to the Rear Axle rating or not, as I wasnt sure what the "RR" stands for. Can someone help me? What is the rating of the Rear Axle in this truck? Thank You Brian

09-03-2020, 07:34 AM	#2
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1967 C40 Rear Axle Rating? I rambled some on this question in your original thread. Does your truck have the SPID on the glovebox door? http://67-72chevytrucks.com/vboard/s...d.php?t=811411 __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~

09-08-2020, 08:16 AM	#3
CarolinaHD Moderator Join Date: Aug 2017 Location: Cabarrus Posts: 418	Re: 1967 C40 Rear Axle Rating? Post a pic of the rear axle, it's either 11k, 13.5k, or 15k pound rear. It's more than likely you have the upgraded 5k front axle with the 11k rear=16k gvwr. I'm not postive what RR stands for but something to do with the rear. 7.5k leaf spring option is the 15k rr springs on your spid Attached Images __________________ Alex 1967 C50 292ci Lumber truck 1967 C50 292ci Dump truck 1967 C60 366ci Fire truck Last edited by CarolinaHD; 09-08-2020 at 09:24 AM.

09-08-2020, 01:20 PM	#4
MJN Registered User Join Date: Feb 2000 Location: Maquoketa, Ia/ Orr, Mn Posts: 3,051	Re: 1967 C40 Rear Axle Rating? RR is simply the abbreviation for Rear Attached Images __________________ '51 South Bend Model "9A" '56 Chevy 3600 NAPCO '74 Chevy Cheyenne Super K20-restored on 37's '72 GMC Sierra Custom K2500- in progress '08 GMC Envoy Denali '12 GMC Sierra 2500HD Denali '17 GMC Yukon XL VCCA member #58596 http://www.nohrco.com

09-08-2020, 02:31 PM	#5
CarolinaHD Moderator Join Date: Aug 2017 Location: Cabarrus Posts: 418	Re: 1967 C40 Rear Axle Rating? Thanks! Ive always wondered, I assume they use FF for front? __________________ Alex 1967 C50 292ci Lumber truck 1967 C50 292ci Dump truck 1967 C60 366ci Fire truck

09-09-2020, 01:02 PM	#7
rkn463 Registered User Join Date: Jan 2012 Location: Iredell, Texas Posts: 582	Re: 1967 C40 Rear Axle Rating? I think the rear diff will have numbers stamped in to it, can you find those? __________________ I may have too many Chevys... Is that possible? 68 c50 pickup build: http://67-72chevytrucks.com/vboard/s...d.php?t=704713

09-30-2020, 08:39 PM	#8
special-K Special Order Join Date: Nov 2004 Location: Mt Airy, MD Posts: 85,851	Re: 1967 C40 Rear Axle Rating? What you'll have is an HO110. All I know is the minimum factory rating is at 11k# and that is an option on the 1t (light truck configuration. Rating up from there depends on spring options __________________ "BUILDING A BETTER WAY TO SERVE THE USA"......67/72......"The New Breed" GMC '67 C1500 Wideside Super Custom SWB: 327/M22/3.42 posi.........."The '67" (project) GMC '72 K2500 Wideside Sierra Custom Camper: 350/TH350/4.10 Power-Lok..."The '72" (rolling) Tim "Don't call me a redneck. I'm a rough cut country gentleman" R.I.P. ~ East Side Low Life ~ El Jay ~ 72BLUZ ~ Fasteddie69 ~ Ron586 ~ 67ChevyRedneck ~ Grumpy Old Man ~



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