Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-2051	Rear	6,785	10

Note: This spring is only for use on the F550 Chassis Cab. It does not fit the F550 Pickup

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1337HD	Rear	14,000lbs	6/4

This is a heavy duty upgrade to the rear spring

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-792	Front	3,825lbs	7

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-2069HD	Rear	5,325lbs	5/1

This is a heavy duty upgrade to the rear spring

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1983	Rear	1,600lbs	2/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1985	Rear	1,900lbs	3/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1749	Rear	675lbs	1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-623HD	Rear	4,000lbs	10

*1978 - 1991 E-350 except passenger vans. This is a direct heavy duty upgrade for the OEM factory 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
43-485	Rear	2,400lbs	6/3

This is a direct replacement/upgrade for the OEM factory spring.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-701HD	Rear	4,295lbs	6/1

This is a Heavy Duty upgrade for the stock springs. Its perfect for plowing and other heavy duty applications.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-695HD	Rear	3,100lbs	7

This is a direct heavy duty upgrade for the OEM factory spring. 

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-630	Front	2,250lbs	2

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-571	Rear	2,450lbs	4/1

This is a direct replacement/upgrade for the OEM factory spring.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-516	Front	2,200lbs	2/PD

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-723	Rear	1,655lbs	3/1

This is a Standard Duty replacement for the stock three leaf spring.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1159	Rear	1,100lbs	3/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1813	Rear	3,000lbs	4

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-903	Rear	1,350	6

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-901	Rear	4,350lbs	8

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-731	Rear	800lbs	4

*For dual rear wheel only

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-721HD	Rear	4,500lbs	12

This is a heavy duty upgrade from stock and is only for the F-350 Dually

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1679-2	Rear	N/A	1

This is a Clip Leaf for the standard 43-1679 spring leaf.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1279	Rear	525lbs	1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1085SHD	Rear	5,000lbs	10

This is a direct replacement/upgrade for the OEM factory spring. 

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1717HD	Rear	6,800lbs	5/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1681	Rear	2,700lbs	4/1

This is a Heavy Duty replacement for the stock leaf spring.

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1783	Rear	1,900lbs	3/1