MagikDragon

Well my parents are the original owners of a 2003 Z71 Suburban and it now has 70k miles with the original front/rear diffs and trans fluids. Now that I am using this truck to tow my race car more and more I think I need to do some PM

My first question is what are the recommended brands/viscosity that work well for the truck?

Second question is what are the fluid capacities? for the life of me, I cannot find them in the manual.

What else would be recommended to make this a pretty reliable tow vehicle in the future?

thanks guys

-Sean

Cody Brooks

iTrader: (2)

5 quarts for the tranny dex3 non-synthetic castrol or mobil work well in gm trannies.
about 2-2 1/2 qts for each of the diffs 75w-90 the gm stuff is a synthetic that works just fine.

if you are servicing the tranny you may consider adding an additional cooler in line with the factory cooler to help keep the temps down. a good cooler is to find a tranny cooler out of a ford 6.0 powerstroke diesel since it is about as big as a a/c condenser.

the best thing you can do is never tow in OD and push that tow/haul button.

MagikDragon

Thanks, How much should I be looking to spend on the oil cooler, or would I be better off getting a new aftermarket one? I'm no stranger to fabrication, so shoot me some ideas.

Cody Brooks

iTrader: (2)

look around on ebay type in ford tranny cooler, and 6.0 tranny cooler. should come up with several results I'm sure you could get one for about $100 and its about 2-3 times bigger than a $50 aftermarket piece. you may check your local junk yards as well.