I'll get thous pics don this week end. do you want to see it with the tire off?Could be a 44A. It is a 44 with c-clip axles. Post up some pics and we'll let you know. If it is the 44A it uses different lockers than a regular 44 and some have an aluminum center section.
Well on Wikipedia says the 5.9 Limited comes with a Standard trac-lock rear differential. I attached a link to Wikipedia have a look.Some are actually steel. If it does have a trac lock, replace the clutches and hope for the best. It uses a different locker than a standard 44. Some of them are c-clip axles. Got a buddy with a 98 Limited and his are and no trac lock. How do you know you have one, only real way I know to be sure is to pull the cover. Guess you could trust the cover tag but mine said it had one and didn't. I wouldn't put a lot of money in that axle unless you plan to stay no larger than 33s.