Posted by Ben on May 07, 19100 at 12:32:48:
In Reply to: How often do you change differential?2 wheel 1/2ton posted by den on May 07, 19100 at 00:07:09:
Engine oil & filter every 3k miles, 8 quarts Mobil1/Purolator
Tranny fluid, every year. 14quarts Mobil 1
Diff (front/rear) every 2 years or 20K miles whichever is 1st. Mobil 1 75-90wt
Transfer case every 2 years or 20K miles whichever is 1st. Mobil 1
Will be flushing the radiator for the first time this year. Won't go this long again. Was going to go by the book based on the new extended 5 year/100K mile red stuff. Not comfortable with that long a period. Considering every 2-3 years. Mine is a '96 K2500/454
If you tow, consider using the manual's extreme duty cycle or even more frequent. My opinion is that it's cheap compared to any overhaul (thousands to several thousands of $$$$ vs several hundred per year...and then factor in the inconvience of having it in the shop for a few weeks).
-Ben