VIN question

[BADAZ chevy guy]

The 4th number in the VIN for my 1977 indicates that it's a "Heavy" 1/2 ton. CCL447####### I'm not sure what all is different between the Heavy and regular half tons for that year.

[andrewmp6]

I think its just bigger springs.

[79Betty]

In a nutshell you have a 3/4 ton truck with 1/2 ton axle and front rotors.

[Keith Seymore]

Originally Posted by BADAZ chevy guy

The 4th number in the VIN for my 1977 indicates that it's a "Heavy" 1/2 ton. CCL447####### I'm not sure what all is different between the Heavy and regular half tons for that year.

It might say in here:

http://www.gmheritagecenter.com/docs...olet-Truck.pdf

K

[RIDE-RED 350r]

Originally Posted by 79Betty

In a nutshell you have a 3/4 ton truck with 1/2 ton axle and front rotors.

I think you have that bass ackwards.

[BADAZ chevy guy]

I know it has 5 lug wheels front and rear. So, the axle and front hubs appear to be 1/2 ton.

[ray_mcavoy]

Originally Posted by Keith Seymore

It might say in here:

http://www.gmheritagecenter.com/docs...olet-Truck.pdf

K

Yes, it's listed in there under RPO F44 "Big-10" ... the GMC equivalent was a "Heavy Half".

Like andrewmp6 said, it was basically just heavier springs to bring the GVW up above 6000 lbs. I believe the whole purpose of doing that was to allow the trucks to be equipped with engines that fell into the "heavy duty" category in terms of emissions. Therefore they didn't need catalytic converters or other emissions equipment that would have been required on trucks under the 6000 lbs GVW limit.