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grouchy01
10-25-2010, 05:02 PM
what can cause my truck to squeak under hard acceleration shift from 1st to 2nd sometimes 3rd?

it has been doing it for a while but its kinda annoying now :no:

'01 5.4 f150
LXS
10-25-2010, 05:10 PM
It's called age! If you're talking suspension, new bushings, shocks, etc. should do the trick.
grouchy01
10-25-2010, 05:15 PM
its not the suspension. it a type of squeak some old cars get when they are turned on early in the morning (squeaky belts)
RedRyder
10-25-2010, 05:18 PM
squeaky belt perhaps?
grouchy01
10-25-2010, 05:20 PM
it only does it under hard accelaration tho. you think it can still be the belt?
LXS
10-25-2010, 05:33 PM
How are your pullies? They're not wobbling at idle are they? I had a co-worker with a Dodge Ram truck that had this vibration and squeak when it idled and while he drove. He popped the hood and his water pump pulley looked like it was about to rattle off! He replaced the water pump...cause was going out anyway...tightened the pulley properly, and that was that, problem solved. Might not apply to you, but worth a check! :)

---------- Post added 10-25-2010 at 05:34 PM ----------

If it's just the belts, try some belt dressing/anti belt squeak spray, then go from there.
ka0tyk
10-25-2010, 05:48 PM
my expedition (we both have 5.4s) will give a little squeak between a floored hard accelleration shift. i swapped the belt to a gatorback and put on a new idler and still same thing. i have a feeling its tensioner related.
Blind
10-25-2010, 05:49 PM
it's the belt, gatorbacks are the documented fix, my truck does it with any belt though I've tried 3 different kinds, just went back to the original one since it only does it on shifts.

my valve body shift kit hits really hard over 1/2 throttle.
BISKIT
10-25-2010, 06:28 PM
it's the belt, gatorbacks are the documented fix, my truck does it with any belt though I've tried 3 different kinds, just went back to the original one since it only does it on shifts.

my valve body shift kit hits really hard over 1/2 throttle.

No shit!!!!
reivaxtorres
10-26-2010, 09:17 AM
if the "squeak" you are talking about sounds somewhat similar to a BOV, then this is a "normal" sound for the trucks. its not a bad belt, not a bad pulley. i remember looking into this once for my truck (01 4.6) and its a feature ford built into it. something about the change of belt-speed at the higher RPM range (under hard acceleration)