In the winter, when the temps get down in the teens, you will find that the transmission doesn't shift real well. some of this can be taken care of by using a high end synthetic trans fluid. I have seen where people plumbed in valves to route the transmission fluid threw the radiator in the winter and then by pass it in the summer. I never noticed any problem with the cold temps and thicker oil damaging the trans.
With a good cooler and an external filter, you will probably be able to get 20000+ out of the oil, this will depend more on how the truck is used, how hot the oil gets and what contaminates are in the oil. I know people who have their automatic transmission oil analyzed every year, most say it is cheaper than just replacing it. These guys are also using some pretty pricey synthetic stuff.
White 2002 Ranger XLT Extended Cab 4.0 4x4 4.10 LS
K&N CAI 77-2529KP
2 1/4" Exhaust
Explorer Dome Light
IN THE WORKS:
Sable Electric Fan
“If you do not know where you are going, every road will get you nowhere.”
Last edited by Clem; 02-21-2010 at 08:34 AM.