1987 - 1996 F150 & Larger F-Series Trucks1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks
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The S847F says it was made at the S=Sterling Plant and the 847F is the application code for the type of Ford it was used on and how much the axle can hold.
It is also a 3.55:1 ratio limited slip 8.8" rear end.
Your date code is not right at it says it was made on the 21st day of the 14th month of 1994.
Tag decoding :
3L55 88 99H06
Second part is the axle ratio: There should be a "3L" preceding the 55 if it's a Limited Slip. If it's open, it would just say '355' .
4th is the ring gear diameter, in your case an 8.8 inch.
5,6,and 7 are the build year, month, and day, in this case, August 6th, of '99. (9=1999, H=8th month [and there is no 'I' in the sequence]) and '06' is the 6th.
The clutch packs are known to wear out. You can get replacements from many online vendors. For a few $$ more you can upgrade to the kevlar model. A simple fluid change is probably not going to fix your problem.
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