Motor RPM's high shifting 1st/2nd/3rd

[bogies]

I replaced the fan cluch thinking that was the problem on my 2001 4.7L
but it still roars when going thru 1st,2nd and 3rd. It also lacks power and down-shifts often. The fluid is full and does not smell burnt. It has 44,000 miles. My warrenty 36/50,000. Any ideas !

[port3460]

I have a '02 4.7 and went thru the exact same problem and almost the exact same mileage. Fortunately I have the extended warranty, because I took it to the dealer and they had no clue what it was. First (2) times I took it they could not duplicate the problem. The third time I had to drive it around for a 1/2 hour with the mechanic to get the problem to appear. First they thought it was:

-valve body and governor actuator in the tranny--wrong
-then I changed the output speed sensor on the tranny myself--wrong
-then after I was able to duplicate the problem for the dealer they believed it was the fan clutch--wrong
-then the dealer thought the radiator was clogged--wrong
-then they discovered the radiator fan was not running at the right speed so they changed that--RIGHT!!!!, well kind of.....

Now the problem appears briefly when its cold out of the garage or after I get out of work. So I don't know what to tell you.

[tommychau]

How do you change the rotation speed of the radiator fan? Throught they are preset on the clutch?

[bogies]

When I replaced the cluch fan, which I felt was the problem all along, I was unfortunate to have bought one which was also defective. I went to Auto Zone and got one made in China for half the price ($49 instead of $101)

Now it runs like new.........Problem solved

[boogirl26]

Be careful...could be a start to transmission problems.....check the torque converter.....