Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1339	Rear	5,100lbs	11

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

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
43-1339HD	Rear	7,200lbs	10

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

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-597	Rear	3,600lbs	7/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-901	Rear	2,850lbs	5/1

Part Number	Location on Vehicle	Spring Capacity	Number of Leaves
22-1419	Rear	1,200lbs	4

*This spring originally came on the 4wd model, and while it is compatible with the 2wd model it will sit taller than stock.