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northerngmc · 12-16-2010, 11:51 AM

GMC Paul sells drop springs for 67-72 C20's. I think they are custom built for the order.

http://www.gmcpauls.com/67-72_d&s.htm

63-72 3/4 Ton Front Lowering Coil Springs Pair
4145722 For 67-72 3/4 ton trucks, Heavy Duty High Performance Front Lowering Springs Available in 1", 2" drop. Sold as a calibrated matched set. These are not cheap imported car springs like others sell these are custom made in the USA and are calibrated matched sets made specifically for the truck they will be installed on. $129.95

63-72 3/4 Ton Rear Lowering Coil Springs Pair
4145732 63-72 3/4 Ton truck Heavy Duty High Performance rear lowering springs. Available in 2", 3", 4", 5" or 6" drop. Sold as a calibrated matched set. These are not cheap imported car springs like others sell these are custom made in the USA and are calibrated matched sets made specifically for the truck they will be installed on. $129.95

This will not get you the 5" front drop you are looking at.

Early Classic http://www.earlyclassic.com/catalog.aspx offers a front spindle conversion to change it over to 1/2 ton and a drop spindle.

-20 ¾ to ½ Ton Conversion 2½" Drop Spindles

Looking to convert your ¾ ton Truck to ½ ton front suspension? We are proud to introduce the only C-20 to C-10 2½" Drop Spindles available on the market. (disc brakes required).
Over the years, we’ve had many customers with C-20 8-lug Trucks that would like to convert over to the better riding C-10 suspension and change their wheels to either a 5-lug or 6-lug bolt pattern. These new Conversion Spindles allow you to upgrade to C-10 front disc brakes on the ’60-’70 model Trucks, and give you the option of 2½" front Drop Spindles for the same price without having to change your tie rods and ball joints.
Several options are available to change the rear suspension and axle as well, and our technical support staff is more than happy to explain the different methods and choices available for each Truck year and model. Give us a call, we’re here to help!

Please post back what other solutions you end up finding....

12-16-2010, 11:51 AM	#4
northerngmc Registered User Join Date: Jan 2004 Location: Whitehorse YK Canada Posts: 2,651	Re: where are the c20 lowering parts? GMC Paul sells drop springs for 67-72 C20's. I think they are custom built for the order. http://www.gmcpauls.com/67-72_d&s.htm 63-72 3/4 Ton Front Lowering Coil Springs Pair 4145722 For 67-72 3/4 ton trucks, Heavy Duty High Performance Front Lowering Springs Available in 1", 2" drop. Sold as a calibrated matched set. These are not cheap imported car springs like others sell these are custom made in the USA and are calibrated matched sets made specifically for the truck they will be installed on. $129.95 63-72 3/4 Ton Rear Lowering Coil Springs Pair 4145732 63-72 3/4 Ton truck Heavy Duty High Performance rear lowering springs. Available in 2", 3", 4", 5" or 6" drop. Sold as a calibrated matched set. These are not cheap imported car springs like others sell these are custom made in the USA and are calibrated matched sets made specifically for the truck they will be installed on. $129.95 This will not get you the 5" front drop you are looking at. Early Classic http://www.earlyclassic.com/catalog.aspx offers a front spindle conversion to change it over to 1/2 ton and a drop spindle. -20 ¾ to ½ Ton Conversion 2½" Drop Spindles Looking to convert your ¾ ton Truck to ½ ton front suspension? We are proud to introduce the only C-20 to C-10 2½" Drop Spindles available on the market. (disc brakes required). Over the years, we’ve had many customers with C-20 8-lug Trucks that would like to convert over to the better riding C-10 suspension and change their wheels to either a 5-lug or 6-lug bolt pattern. These new Conversion Spindles allow you to upgrade to C-10 front disc brakes on the ’60-’70 model Trucks, and give you the option of 2½" front Drop Spindles for the same price without having to change your tie rods and ball joints. Several options are available to change the rear suspension and axle as well, and our technical support staff is more than happy to explain the different methods and choices available for each Truck year and model. Give us a call, we’re here to help! Please post back what other solutions you end up finding.... __________________ Blaine 59 GMC 9314 a.k.a. Whoopee 68 C20 50th Anniversary a.k.a. The Rat http://www.flickr.com/photos/northerngmc/ http://www.members.tripod.com/P-wee/index_032.htm 1.61803 is one H of a lot better than 3.14159, no really it is!