Within the last 3k miles on my 09 150, 4.6 3v, 6 sp tranny i've noticed that when I come to a stop or take off from a stop I feel some sort of slack and a clunking noise, don't know if it's in the tranny or the differential somewhere, I've got 21k on it now. Does anyone else notice this? and what could it be?

 

Downshifting?

 

No, not down shifting, happens right when I come to a stop and right when I accelerate.

 

Search for my post on the TSB on clunking on downshift.

 

It's the driveshaft splines... more than likely. They just need to be lubed. Dealer can do it in about 10 minutes. No biggy.

 

yep....i'll second that...pretty easy fix

 

Thanks guys, I'll take it to the dealer and see what they say about it.

 

Says Expedition, but it's similar for the F150.


TSB 08-22-7

11/10/08

DRIVELINE BUMP WHILE BRAKING - BELOW 10 MPH (16 KM/H)
FORD:
2007-2008 Expedition

This article supersedes TSB 08-4-13 to update the Issue, Service Procedure and remove the production fix date.
ISSUE
Some 2007-2008 Expedition vehicles may exhibit a bump feeling while braking to a stop below 10 MPH (16 Km/h). This procedure will improve the bump felt while braking to a stop.

ACTION
Follow the Service Procedure steps to correct the condition.

SERVICE PROCEDURE
CAUTION APPLYING THIS PROCEDURE TO UNITS THAT DO NOT EXHIBIT THE COASTDOWN BUMP MAY RESULT IN WORSE SHIFT QUALITY.

NOTE DO NOT ATTEMPT TO REPLACE THE MECHATRONIC UNIT. MECHATRONIC REPAIR/REPLACEMENT IS NOT AUTHORIZED FOR THIS ISSUE.

1. Install Integrated Diagnostic System/Portable Diagnostic Software (IDS/PDS) or equivalent and ID the vehicle.

2. Update the Power Control Module/Transmission Control Module (PCM/TCM) calibration using IDS release 57.8 and higher or 58.1 and higher. This new calibration is not included in the VCM 2008.9 DVD. Calibration files may also be obtained at the website. Since the TCM cannot be independently reprogrammed, reprogram the PCM to ensure that engine and transmission calibrations are updated to the latest level simultaneously.

a. Verify that the TCM shows 8L1P-7J104-AC (8L1P-7J104-BC for 2008 vehicles built after 12/3/2007) part number after reprogramming is complete.

b. Select the following from IDS, Tool Box, Powertrain, OBD Test Modes, Mode Level 9 Vehicle info, TCM Cal Part Number.

3. Clear TCM keep alive memory (KAM) and adaptive tables.

a. Using IDS:

(1) Open Toolbox.

(2) Choose Powertrain.

(3) Choose Reset KAM.

(4) Then Choose TCM.

b. Using PDS:

(1) Choose all Tests and Calibrations.

(2) Scroll down the menu and choose reset TCM KAM.

NOTE FOR PDS, RESET TCM KAM IS NOT THE SAME AS CLEAR TRANSMISSION ADAPTIVE TABLES, WHICH IS UNDER THE POWERTRAIN - TRANSMISSION MENU TREE.

NOTE UNHOOKING THE BATTERY WILL NOT CLEAR THE TCM KAM.

NOTE DO NOT CLEAR THE PCM KAM.

4. Verify that the transmission fluid temperature (TFT) PID is above 175 °F (80 °C). If it is not at 175 °F (80 °C), drive unit approximately 3 miles (5 Km) to reach temperature.

NOTE TFT MUST BE AT 175 °F (80 °C) OR ABOVE BEFORE PROCEEDING TO STEP 5.

5. Drive unit to perform adaptive shift strategy learn:

a. Accelerate from rest with light throttle to 15 MPH (24 Km/h), remove foot from accelerator pedal.

b. Brake very gently to a complete stop (allow at least six (6) seconds).

c. Repeat Steps (a-b) a total of five (5) times in the dealership parking lot or similar setting.

d. Accelerate from rest with light throttle ensuring that the 1-2, 2-3 and 3-4 shifts occur at engine speeds between 1300-1800 RPM.

e. Continue to accelerate until you achieve 50 MPH (80 Km/h) or the 5-6 upshift.

f. Brake gently to a complete stop and hold foot on brake for at least 10 seconds.

g. Repeat steps (e-f) three (3) times.

NOTE THE HARSH BUMP FELT WHILE BRAKING TO A STOP WILL BE IMPROVED. HOWEVER, SEVERAL DAYS OF DRIVING ARE REQUIRED FOR THE TRANSMISSION TO FULLY ADAPT.

WARRANTY STATUS: Eligible Under Provisions Of New Vehicle Limited Warranty Coverage IMPORTANT: Warranty coverage limits/policies are not altered by a TSB. Warranty coverage limits are determined by the identified causal part.

OPERATION DESCRIPTION TIME

082207A 2007-2008 Expedition: 1.0 Hr.
Check DTCs, Reprogram
The PCM And TCM,
Includes Time To Clear
KAM And Perform Road
Test. Authorization Decal
Not Required (Do Not Use
With 12650D)

DEALER CODING

CONDITION
BASIC PART NO. CODE
RECAL 04

 

hey let me know how it turns out not only am i having sound system issues, last week or so i am getting the same symptoms in my 2010 kr tranny and i dont like it really annoying thanks got around 5800 miles on her now

 

hi barry truck was taken in monday for sound issue and the amplifier was repalced hopefully solving the sound system issue and when i brought the truck in in the morning told em about the tranny bump or slack on braking and acceleration told me about a reprogramming of the pcm i think he said and should resolve the tranny issue pick it up today

 

Thanks, Let me know if that solved the problem. I haven't had time to take mine in yet.

 

sure thing barry

 

Barry, Did you ever get your vehicle seen about?

I have a 2010 Ford F150 and when I slow down to a complete stop is when I feel the bump. I only have 5900 miles on it.

 

Are we talking about the last ~1 second of the stop? Because I was just commenting the other day that it feels like something is loose back there. To me it doesn't feel like a driveline issue, it feels like a chassis issue. Like the rear axle housing is shifting just a hint when i make the stop. I don't get anything when I take off, but there is a definite second-order vibration when I come to a complete stop.

 

Yes, it's like right before I get to a complete stop, it's a small jump and it does not happen all the time. Also, one thing I have noticed is that if I downshift to 1st,2nd,or 3rd gear, it does not jump when stopping. It is only when I am in overdrive or that's what it seems to be.