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

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

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

Re: 1967 C40 Rear Axle Rating?
 

RR is simply the abbreviation for Rear

Re: 1967 C40 Rear Axle Rating?
 

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

Re: 1967 C40 Rear Axle Rating?
 

FRT is front

Re: 1967 C40 Rear Axle Rating?
 

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

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