Trans/tcase fluid

[goeb34]

My onstar suggest i change my trans and tcase fluids at 97500 miles and i just rolled over that, best kind of fluids to use? Diy or let dealership/shop deal with it?

[Mike GMC]

The t case is easy.  The trans on these trucks is not something I've tried yet but I was thinking of taking it in for that.

 

I use all Amsoil fluids, but you may have your own favorite.

 

Do the diffs as well.

Edited August 12, 2018 by Mike GMC

[Black02Silverado]

You can DIY.  Easy to do.  Make sure you get the proper fluid.  AMSOIL's ATL fluid meets both dexron VI and HP which is used in both the transmission and Tcase.