Transmission leaks when towing

marcsbigfoot20b27 wrote:

SidecarFlip wrote:
First thing I did was landfill the stock transmission cooler on my F350 and replace it with a Hayden 12 pass swirl cool cooler, then I landfilled the stock sheet metal transmission pan and replaced it with a cast aluminum, finned B&M deep sump pan that adds an additional 4 quart capacity. The B&M pan comes with a temp sending boss cast in.

None of the FoMoCo factory cooler are worth much and a slush boxes main killer is heat and foaming fluid. My box never exceeds 210 degrees, no matter how hard I'm pulling in 2 or 4 wheel drive in any range, on road or off road.

The B&M pan makes fluid changes super easy too. My fluid gets changed every fall no matter how many miles I drive. Every 2nd year the pan gets dropped and a new filter installed (with the fluid change). Dexron Mercon V comes in 5 gallon pails btw.

Try the 6.0 Ford trans cooler in a 31-33 row. I never see more than 170 EVER even in Phoenix at 115 degrees towing 7000 lbs up big grades at full throttle 70mph.
The 6.0 cooler is HUGE.

Never checked one out. When I installed the Hayden, the 6.0 wasn't around. I installed it (or should I say Ford SVO-Dearborn) installed it in the truck in 1998 along with the B&M pan, metallic clutch plates, high stall sintered converter and a bunch of other stuff like lockers front and rear, extreme duty universals and a full air-to air Banks kit and chip. At the time, my BIL was one of the head men at SVO. he's since moved on to transmission engineering, he designed the current 10 speed that is coming out in the new 150 pickup trucks.

Fine the way it is and no issues. I just keep the juice changed and the K&N tuned intake filter clean. 5-40 Rotella and the big Motorcraft filter. How about 390 to the rear wheels at 60 mph locked out of OD. It's a cooker and smokes like a freight train. I just keep a close eye on the pyrometer when lugging it and the boost is up around 30 psi.