replacing Ball Joints, 4600lb axle or 3850?

[Denver_Diesel]

I am trying to order new upper and lower ball joints for my OBS PSD F250. Napaonline.com shows the narrowest selection (there are even more options at rockauto.com). The upper ball joints are easy as there is only 1 kind...But, for the lower, there are two options: 1) 4600 lb drive axle and 2) 3850 lb drive axle. Both appear the same as pictured, and are greaseable joints.

I would hazard a guess that my TTB is a 4600, but I really have no idea? Can someone help me on this?

[rolsmojave3]

I would guess the 3850 lb is for the old D44 and the 4600 is for the D50 which you would have...Not for certain though.

[CT Performance, Inc.]

Call Extreme Axle Sales Talk to Doug..great guy for D60's has it all.

Cary

[rolsmojave3]

I was thinking too much last night...Maybe the lighter ones are for the light duty f-250 of that year...the one that looked like the new f150. And the heavier for your f-250 HD.