Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-547	Rear	2,600lbs	8/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-525	Rear	1,290lbs	4

*This spring was not originally offered and is an upgrade for the Colorado and Canyon.The centerbolt on the Colorado and Canyon is originally 5/16 and installing this spring will require modification to the centerbolt head or axle seat hole as it comes with a 3/8 centerbolt.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-617	Rear	3,995lbs	10

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
34-213	Rear	2,500lbs	5/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1855	Rear	2,700lbs	2/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-419	Rear	3,390lbs	7

*This spring was not originally offered and is an upgrade for the Colorado and Canyon.The centerbolt on the Colorado and Canyon is originally 5/16 and installing this spring will require modification to the centerbolt head or axle seat hole as it comes with a 3/8 centerbolt.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-485	Rear	2,775lbs	7

*The 22-485 is a lower arch spring than the 22-489.  For a higher arched spring you can view the 22-489 by clicking HERE*This spring was not originally offered and is an upgrade for the Colorado and Canyon.The centerbolt on the Colorado and Canyon is originally 5/16 and installing this spring...

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-547HD	Rear	3,500lbs	8/1

This part fits the following make/models:   1957 - 1959 C10 Front and Rear Springs 1957 - 1959 C20 Front Springs (3400/3500/3700 Series - not Double Duty) 1955 - 1959 C20 Front Springs (3400/3500/3700 Series) 1955 - 1959 C30 Front Springs (3800 Series)

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
34-1321	Rear	575lbs	1

This is a helper spring for the stock 4 leaf spring.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-623	Rear	3,235lbs	10

*1978 - 1991 E-350 except passenger vans. This is a direct replacement/upgrade for the OEM factory spring. 

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-489	Rear	2,775lbs	7

*This spring was not originally offered and is an upgrade for the Colorado and Canyon. The centerbolt on the Colorado and Canyon is originally 5/16 and installing this spring will require modification to the centerbolt head or axle seat hole as it comes with a 3/8 centerbolt.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-499	Rear	3,390lbs	8

*This spring was not originally offered and is an upgrade for the Colorado and Canyon. The centerbolt on the Colorado and Canyon is originally 5/16 and installing this spring will require modification to the centerbolt head or axle seat hole as it comes with a 3/8 centerbolt.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1747HD	Rear	5,500lbs	10

This is a Heavy Duty upgrade for the stock springs.