Installed D-60

[wls]

I just got done installing the d-60 in my 1997 f-250, which had a 4600# front axle, I retained the stock springs, and added 1300# front springs, 650 per spring. Question is, what do I have now, a 5900# front spring rating. The reason I'm asking is that I'm installing a blizzard 810 plow, which weighs about 1000#, and wondering whether to add timbrens or not. I've run 5200# fronts in both dodge and fords with the blizzard on, and put timbrens on. Thanks