Hi all,

I recently did a fluid change on my 05 silverado 2500hd. (4.10 rear diff, auto 4x4)

I went to the local dealer who persauded me to buy there "4x4 service kit". This includes BG synthetic 75-140 for the front and rear diffs, and 75-90? for the transfer case. (the transfer case weight escapes me at the moment...) I also changed the tranny fluid/filter.

My mileage went from 13.2mpg average to 11.5mpg after doing this service. I have checked it over 2 tanks worth of gas now. Has anyone experienced this?

Thanks for input!

Jake

 

75-90 synthetic front and rear diff. Auto trac in the transfer case. I wouldn't drive it with what you have in it now.