Question about 2004 Ford F150

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Tranny slipping around 35 mph. is it going bad or could it be something else

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Im sorry to say but its only going to get even worse and to save yourself an even bigger bill get it look at sooner rather than later

Posted on Aug 28, 2010

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2 Answers

Transmission


A/T or M/T (auto or stick ,we dont know)
n moving in drive, reverse or Low or 1? or 2? (me too lazy to look what tranny you have)
it can be 2 things
1: lack of engine power
2: bad clutch or transmission

who do we tell? easy
you step on gas , RPM goes way high and MPH dont. (slips)
tranny slip.
you step on gas, RPM tracks with MPH, good ,
you then do the 5second max. tranny stall test in every car FSM made. and see the stall speed, with brakes hard set.
too high is tranny slip
way to low, engine power POOR.

alldata.com has all this on tranny. stall speed.
the FSM turn to on car A/T service, see STALL test.
bingo.
or youtube the vast number of videos on topic, stall.


wont move at all ,can be :
brake drag (passes stall test)
but first , the tests are, for bad engine or trans,
pick the one it is , state so, and we can go much farther.

Nov 26, 2013 | 1992 Honda Accord

1 Answer

2001 kia sephia slips out of gear. Trouble codes P1500, P1624, P0740.


Low fluid or too much ATF? (foaming it up and killing bearings)

p07xx is tranny DTC codes. (errors)
TCC lockup failure. (the TCM commanded the lock and
the tail shaft sensor did not rise in RPM
that is the engine RPM does not match tail RPM or 1:1 ratio.
which is LOCK ratio.

1500 is speed sensor , reads wrong,
No Vehicle Speed Signal to TCM.

1624 means.
MIL Request Signal from TCM to ECM.
the means simply the Tcm SAW and error and sent that error up stream to ECM. creating 1500.
remember the ECU never knows what part is bad.
NEVER ! it only knows, the tests failed. (monitors)
the first thing i do is find out which VSS failed.
on some cars there are 2 to 5
the first speed sensor is RPM does the scan tool show correct engine RPM? y/n
if yes,
does the scan-tool show correct MPH? sensor 2.
y/n if not fix that first.
the TCM function (tranny brain must not be lied to, in this order)
engine RPM , MPH.
and last the tranny its self as VSS (rpm) sensors. 1 to3.
my guess, (too lazy to look it up) has 1 sensor on the tranny tail.
if all is good and 1500 means VSS 2 tranny tail is fibbing.
then its one of 3 things.
(all others good)REMEMBER the TCM does comparisons to all speed sensors to shift the car correctly so the front sensor count first. then last the rear.
VSS2 lies. this is bad bad tranny (slips) bad wires to VSS2 or bad VSS2.
most TCM go to limp home when the tranny slips to stop burning up the clutch packs. may skip gears too.

now what does slips out of gear mean. a neutral FLARE?
or down shifts,
if the tranny ever slips. this is bad news.
if it does slip 1500 is only the warning that it did
it say RPMs go out of control and threw 1500 pronto.

Try to think(sic) like a TCM what would you do if the tranny malfs.
answer, throws codes.
and goes to limphome, if necessary, (FSM show these facts)
so does alldata dot com
what i do is try to get tranny to slip. using all gears.
if it slips ,its bad.
The TCM can not run a slipping tranny.
the TC does slip, but the TCM has that all figured out. (modeled)
not locked, and locked it must not.
good luck and do ask questions.

Oct 16, 2013 | Kia Sephia Cars & Trucks

1 Answer

1998 Lincoln navigator with 180,000 miles is recently getting bad gas mileage and around 35 to 40 mph it will **** and seems to lose power then will start driving normal again but always have to press...


Your description sounds more like a torque converter clutch problem. It would explain the poor mileage, having to floor it to go. I suggest having the transmission scanned, looking at the slip speed of the torque converter clutch.

Sep 09, 2013 | Cars & Trucks

1 Answer

Dodge charger wont go over 35 mph


I have a 2007 Dodge Charger won't go over 35-40 mph and once you get up to that speed it jumps back and forth and when you start it and put it in gear to go it jumps real hard. My mechanic and a transmission specialist said it was a bad tranny I bought a used tranny and the used one wouldn't even shift into gear so now putting another tranny and another computer system in it. Does anyone know anything else it could be I'm so tired of this vehicle

Apr 23, 2012 | 2007 Dodge Charger SRT8 Sedan

1 Answer

2002 rpm goes up to 2,000 rpm when i start it and around 40 mph it feels like it slips and goes up to 3,000 and stays goes up to 4500 rpm at 70 mph burning alot of gas and my engine just started rocking...


Sounds like the clutch, if a standard trans, needs to the be replaced. If it's an automatic, you need to take it in for diagnosis. Your trans. might be going bad, slipping, may just be low on fluid, if it is use some Lucas trans nonslpi and the proper tranny fluid to fill it to the proper level. Add the fluids and test drive bfore going to the shop, unless the tranny is fuul allready.

Oct 20, 2010 | 2002 Mitsubishi Lancer

3 Answers

2001 Mazda 626 transmission slip..maybe?


IT sounds like there is another problem and not the tranny. Sounds like you might be having something else going bad. Are there any check engine lights?

Feb 06, 2009 | 2001 Mazda 626

1 Answer

My 1992 Jeep 4.0 automatic wont shift into drive and overdrive.


Alot of transmissions run a small vaccum shifter. IF you are up to it, crawl under the jeep and look at the side of the tranny (should be the right side of the car, right above the tranny pan you will see it. its only 2-3 inches in diameter There is also a vacuum line running to it about 1/8th inch rubber line. Its either off or broke near the vacuum shifter.

Hope this helps, Goodluck.

Curt

Dec 16, 2008 | 1992 Jeep Cherokee Briarwood

1 Answer

96 deville weird tranny


front clutch worn garage only repair

Nov 18, 2008 | 1996 Cadillac DeVille

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