1992 Ford F-250.
Question = Upon take off from a dead stop, my Automatic transmission will give a lurch and a clunk
and go into the next gear. It never happens when driving, just on take off, and then, only sometimes.
Tranny guy told me to change fluid and filter and check for broken springs from looking up into
bottom of transmission. He said that Ford shifting springs, though powerful, would at times break and
make the sound and act the way I described to him. He said it could be repaired from the bottom of
the tranny without removal.

Does that sound like the correct solution? And if so, where can I purchase the springs?
also that the one, original spring, is usually replaced with two springs (one inside the other) to give a
smother shift. Thanks for any help.

Answer: You can buy a transmission master rebuild kit for about $189.00 that will have all the parts.
You don't really need that though and a spring is a spring so find the broken one and go to the
dealer and buy a spring and replace it. This dual spring setup is an update that Ford has for this
condition.I would check the motor mounts first though as a broken motor mount will give you the
same symptom.

2002 ford f 150
I replace thermostat and antifreeze.
Question: no heat at all flush coolant system flush heater core and nothing. A/C seems to be running
all the time even when knob points to heat?

A flush of the heater core does not always get the gunk out. You need to feel both heater hoses
where they go into the heater core under the hood. See if they are both hot. If they are, that means the air going over the heater core is not removing the heat from it, thus giving hot air from the vents. This means the core is still plugged. You may need to flush the heater core in the opposite direction of normal flow through it to remove the restriction.

You can do this by removing the heater hose to the core and use a garden hose on full blast. Blow thought each hose while watching the water come out he other. It should turn from brown to clear.

You might have a temperature door problem in the dash not moving to the hot position. This is a common thing with the
type of system that has electric motors that control the temperature doors.

I would not be too concerned that eh A/C compressor is on all the time. This can be normal. Even if it is on , the temperature door in the truck should be in the hot air position, so no air will be going over the evaporator and cooling, so that should not effect the temperature from the vents.

Ford F-250 Transmission Clunk- F150 Has No Heat
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