Rear Diff Fluid

[koda2000]

I got the full 12+ quarts out of my 98 transmission last year. The TC had a gallon in it, and I had the VB out for an hour or so. It took over 14 quarts to fill it back up, since I changed to a deep pan.
On these super cold mornings, I wish I had a thermostatic switch to keep the ATF from looping through the coolers. I'm going to put one together when I get the time, it's taking over five minutes to get some heat in the trans first thing.

I though the transmissions had a thermostat in them... ?

 

[96eb96]

I though the transmissions had a thermostat in them... ?

Not 4R70W. If you do it on the 55R series you are just draining the valve body, I think posted a diagram a bit back.

 

[CDW6212R]

Yes, the 5R55E was the first Ford trans to keep the fluid from the cooler until it warms up. The older models and the 4R flow to the cooler all the time.