Changing transmission fluid
My 2010 silverado is creeping up on 30k miles. I pretty much only use it for towing or hauling something. Tranny temps while towing are typically around 200-220 and some minor runs at 235 on large gra...
Forum Discussion
NHIrish wrote:
My 2011 with Allison has a severe service change interval of 25000 miles. I changed it with Valvoline Dex VI full synthetic at 20,000. Change is easier than an oil change. Drain fluid, change spin on and add 7.4 qts.new fluid on mine. No dropping the pan or changing the internal filter.
Chevrolet recommends Dex VI for my year...Allison does not recommend Dex VI anymore ( maybe since they are no owned by GM or however that went). They recommend Transynd or similar. Way too pricy for me at 70 bucks a gallon. I go with the full syn Dex VI and keep my intervals short. Virtually all of my mileage is towing 15000 lb fifth wheel.
You'll get plenty of chirps on this one.
Irish
Remember, you're only getting about half the ATF out this way. Not a bad thing since you are religious about the fluid and filters.
FWIW, Allison will extend the warranty on med duty Alli equipped trucks if switched out to Transynd when relatively new (or they used to anyway). That tells me it's good stuff. And doesn't need changed out as often.
