The D60 started early to mid 2002 on the SD's.
I agree with everyone else, put the money in a d60.
Jack
Especially if it's a TTB! I hate those things!
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But the solid axle 99+ Dana 50's are pretty good. Those are actually Dana 60's with a Dana 44 ring/pinion. So it can handle the torque a 44 can, but the smae weight a 60 can. As long as you don't twist up the front axles while locked up in a turn or rockcrawl with them you'll be OK.
Dana 50 = 229
Dana 60 = 248
Dana 70 = 267
Dana 80 = 286
The three digit model number is cast into the center section, upside down, on the passenger side above the horizontal reinforcement rib. The three digit model number is also on the paper assembly tag in a box in the bottom right corner.
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Dana 44 under a fulsize=I'm pulling it and swaping a 60 in.
Dana 50 TTB= I'm swapping a 60 in.
Dana 50 solid under a 99+ Superduty= I'm happy as long as I don't want a cheapo locker. Stick to Truetrac's, Detroit, and ARB. ARB being the best choice for the 50.