stock 6.4 hard shifting at 40 mph - Ford Powerstroke Diesel Forum
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post #1 of 9 Old 05-20-2011, 09:21 AM Thread Starter
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stock 6.4 hard shifting at 40 mph

my truck shifts bad around 40 is this normal??
thanks

2008 F250 CCSB
Gearhead Hot Street
No limit intake and Cold Side Pipe
EGR Delete
CCV Mod
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post #2 of 9 Old 05-20-2011, 12:42 PM
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No, not on a stock truck.

08 F250 CC, 4x4, Blue/Pueblo Gold, 3.73, S & B CAI, 5" Magnaflo downpipe back, Spartan TCM 275 & 310 KEM 345 (SCT - Sold) Mickey Thompson 35 12.5 20's


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post #3 of 9 Old 05-20-2011, 12:46 PM
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When you say bad do you mean hard?

I know mine shifts kinda hard but it is normal

Jeremiah
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5" FLO-PRO exhaust W/6" tip
AFE stage 2 CAI
Spartan tuner
PTP EGR Delete
coolant filter
CCV Mod
leveling kit
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20's W/35's
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post #4 of 9 Old 05-20-2011, 02:12 PM Thread Starter
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idk if its hard or what but you just feel it more than any of the other shifts.

2008 F250 CCSB
Gearhead Hot Street
No limit intake and Cold Side Pipe
EGR Delete
CCV Mod
5" Flo Pro
Ranch Hand
35" Nittos

Texas A&M Construction Science


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post #5 of 9 Old 05-20-2011, 02:33 PM
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I have 171k on my truck and when i get on it it shifts harder then when i drive it normal. I have road in a few 6.4 and they all have done that.

Jeremiah
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2008 6.4 with 200k and counting
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5" FLO-PRO exhaust W/6" tip
AFE stage 2 CAI
Spartan tuner
PTP EGR Delete
coolant filter
CCV Mod
leveling kit
4in rear Blocks
20's W/35's
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post #6 of 9 Old 05-20-2011, 10:29 PM Thread Starter
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thanks for all your help!

it shifts perfect when i get on it. its only when i am accelerating slow that it does it the slower it is the worse it does it???

2008 F250 CCSB
Gearhead Hot Street
No limit intake and Cold Side Pipe
EGR Delete
CCV Mod
5" Flo Pro
Ranch Hand
35" Nittos

Texas A&M Construction Science


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post #7 of 9 Old 05-22-2011, 10:11 AM
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Mine lurches a bit when the torque converter locks right around 35mph on partial throttle. Is that what you're referring to?

When it locks, the truck is a whole different beast...

'05 F150 FX4 SCrew
'10 F350 Lariat FX4 CC SRW LWB
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post #8 of 9 Old 05-22-2011, 12:27 PM Thread Starter
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not sure

ill see if it does it around 35 but it just feels weird and you can feel it buck or search. thinking about taking it in

2008 F250 CCSB
Gearhead Hot Street
No limit intake and Cold Side Pipe
EGR Delete
CCV Mod
5" Flo Pro
Ranch Hand
35" Nittos

Texas A&M Construction Science


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post #9 of 9 Old 05-22-2011, 01:14 PM
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If you are questioning it i would say the best thing to do is take it to a well known tranny guy and have him drive it.

Jeremiah
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2008 6.4 with 200k and counting
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5" FLO-PRO exhaust W/6" tip
AFE stage 2 CAI
Spartan tuner
PTP EGR Delete
coolant filter
CCV Mod
leveling kit
4in rear Blocks
20's W/35's
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40 mph , 6.4 , hard shifts , stock

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