We have had an easy winter this year on Long Island .Cold weather came last week end.4r70w in my 98 4#4 does not like to shift from 2nd to 3third until I drive two or three blocks in cold weather.As truck warms up it shifts fine,normal shift points.Ihave pumped out 3qts. from dip stick tube,added new mercon 5.Too dam coldto dump whole tranny now.truck has 70,000 on it. Any ideas?
It is a 4 speed but sometimes the shifts hang awhile when the fluid is cold.
It won't engage OD until a certain min warm temp is reached.
I won't say you don't have a problem but if it shifts ok after the engine warms I would not worry to much unless you see a problem when the temp outide rises.
Around here is has gone down to at least 10*. I often see shifts hang in all my trucks and car when driving off in temps that cold.
The trans won't heat very fast just sitting. The fluid has to circulate and be helped along being warmed by the radiatior temp heating the fluid as it runs thru the coolaing lines to and from the radiator and the fluid shear in the converter while driving before lock up into OD.
These all contribute to the whole situation.
I work one block from the highway I take to get home, and at night when it's cold and I jump in and take off, it won't go into OD until I've driven at least a mile.
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Originally Posted by RockPick
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Hum.. I was just going to post a thread about this. Seems stupid to me. Average temp is between 5º & 15º in the mornings here from December to March. I drive my F150 to work (about 8 miles) and it never gets hot enough to use the overdrive, end up wasting a lot of gasoline turning 2500 rpm on the highway.
Is there a way to override or alter the setting on the temp. sensor?
Well aside from just thinking it's stupid, there are reasons this this done.
Find away around it and cost yourself lots of money just to save a few pennies on gas.
The fluid viscosity is much higher in cold temps, causes high system pressures and the lockup friction material slips and wears much faster, seals are not as pliable etc.
That enough reasons?
I drive my F150 to work (about 8 miles) and it never gets hot enough to use the overdrive, end up wasting a lot of gasoline turning 2500 rpm on the highway.
You're barely wasting any extra gasoline by not having the TC locked up when the fluid is cold.
Yep, my 01 with the 4r70w does the same thing like clockwork. I live in Minnesota and it's gotten below zero a few times this winter and it takes up to 4 or 5 miles before the tranny starts shifting smoothly. Drive it nicely and don't accelerate hard until the truck has reached its normal operating temperature.
Well aside from just thinking it's stupid, there are reasons this this done.
Find away around it and cost yourself lots of money just to save a few pennies on gas.
The fluid viscosity is much higher in cold temps, causes high system pressures and the lockup friction material slips and wears much faster, seals are not as pliable etc.
That enough reasons?
is this true for every trans.?? it could be 0 degrees outside and i can go hop in my 93 T-Bird and as soon as i hit about 42-43 mph it will shift into OD. is my temp sensor out in the bird or what?
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