Transmission Service?
I have a 2013 GMC Sierra 2500HD 2WD with 3.73 rear. 32K miles with 20K of that towing a 6K (loaded) TT. I carefully monitor trans temps when towing and it runs in the 145 to 170 degree range almost al...
Forum Discussion
gmcsmoke wrote:
while I agree excessive fluid changes are not necessary, I'm becoming a firm believer in an initial change at 5k then half the recommended schedule.
for example: front and rear diff, transfer case for a gm HD truck is 100k, I changed initially at 5k and the rear was black and a lot of shavings. changed at 50k, dark brown, changed again at 90k dark brown.
I could go 100k on the diff's but based on what comes out of my vehicle I wouldn't want to.
I should add, the most often over looked fluid is brake fluid, I routinely flush that every 50k, or 3 years.
I agree on brake fluid. I never go more than 2 years between a full flush pressure bleed with DOT4+ fluid. Especially on my trucks where I tow heavy. Last thing one wants is brake fade from boiling fluid.
GM back in 04, specified changing the fluid in the eaton autolocker rear at 5K miles, after rear diff break in. Somewhere between 04 and 2015.5 that went away. But I did that anyway on the eaton autolocker in my 2015.5 Denali 2500.
