If your looking for roughly 2" of lift on a stock 4x4 f150, most get the Moog CC844. If you just want to clear your 31" tires on a 2wd truck, you would probably get enough lift from a CC824.

Spring # CC818
Inside Diameter 4.000
Bar Diameter 0.703
Install Height 12.13
Load rate (lbs) 1258
Spring Rate (Lbs/in.) 337
Free Height 15.75
End Type pigtail ends

Spring # CC820
Inside Diameter 4.000
Bar Diameter 0.718
Install Height 12.13
Load rate (lbs) 1428
Spring Rate (Lbs/in.) 366
Free Height 16.19
End Type pigtail ends

Spring # CC822
Inside Diameter 4.000
Bar Diameter 0.718
Install Height 13.00
Load rate (lbs) 1230
Spring Rate (Lbs/in.) 366
Free Height 16.38
End Type pigtail ends

Spring # CC824
Inside Diameter 4.000
Bar Diameter 0.718
Install Height 13.00
Load rate (lbs) 1442
Spring Rate (Lbs/in.) 366
Free Height 16.94
End Type pigtail ends

Spring # CC844
Inside Diameter 4.000
Bar Diameter 0.812
Install Height 12.75
Load rate (lbs) 1557
Spring Rate (Lbs/in.) 630
Free Height 15.40
End Type pigtail ends

Spring # CC844S
Inside Diameter 4.000
Bar Diameter 0.812
Install Height 13.00
Load rate (lbs) 1759
Spring Rate (Lbs/in.) 629
Free Height 15.79
End Type pigtail ends

 

im trying to get as much lift as i can out of it. is the Moog CC844 a spring i buy from autozone or advance or is it something i can get from the junk yard off of another truck?

 

Both. max lift will come from a C844S spring. be warned that higher spring rates comes a harsher ride. If you want to get 2" of lift without rattling your teeth out, pro-comp makes a lift spring that will raise a 4x4 2" and it only has a 400 spring rate, so it's not much tougher than a stock f150 spring.