What causes auto trans to not "grab" - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 9 (permalink) Old 03-30-2010, 08:00 AM Thread Starter
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What causes auto trans to not "grab"

What in the 4r100 is failing if it doesn't grab at a stop? As if you were in a stick shift and put the clutch in? Slight hill and you do not apply brake and roll backwards? Or hit the throttle from a stop and it revs because it isn't in a gear then drops in like dumping the clutch and smokes the tires? I knew not going with BTS would be biting me in the ass just wasn't expecting it to be in less than 5,000 miles.

Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
Adrenaline
AFE stage 2
Super 66 Turbo
4" straight pipe
Modded IDM
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's
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post #2 of 9 (permalink) Old 03-31-2010, 03:47 AM Thread Starter
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Re: What causes auto trans to not "grab"

Anybody have any ideas? New issues also. Drove on the highway for 2hrs and everything was fine. Get into town and problems started. Temp only got up to about 150. Did the thing where it acted like it wasn't in gear until throttle was applied from a stop. Also the TC wouldn't lock right as I was getting close to home. I was going over 50mph and it wouldn't lock. Wouldn't even lock with my lockup switch. What is causing that? Is it the TC itself or something else? Along with this it had a wierd sound that I can't figure out how to describe as I was driving in town. Kind of like a rattle, like when the center caps on a set of wheels are loose. Then as I was backing into my driveway it had a nasty moaning sound, kind of like a dying cat while it was in reverse. Any info would be great. Everything is still under warranty but local shop that built it about 5k miles ago, really pissed me off at the time, so I don't want to take it to them without knowing what is going on with it first, so they can't blow a bunch of smoke up my ass.

Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
Adrenaline
AFE stage 2
Super 66 Turbo
4" straight pipe
Modded IDM
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's
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post #3 of 9 (permalink) Old 03-31-2010, 03:57 AM
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Re: What causes auto trans to not "grab"

What torque converter did you go with, does it have a shift kit in it? Does it only act up from a dead stop or can you be rolling and then have it slip also?
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post #4 of 9 (permalink) Old 03-31-2010, 04:08 AM Thread Starter
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Re: What causes auto trans to not "grab"

It's a PI converter from David. It doesn't have a complete VB, but has the tugger kit. It doesn't slip when rolling, but does feel like it is possibly lugging a bit more, just feels slower i guess, but not all the time. That's actually how I knew it was going to start acting up at a stop when I was getting close to home. It felt slower as I was cruising, the best thing I can think to describe it is if you ever forgot your parking brake was on, an old loose parking brake that kind of grabs. Then when I came to a stoplight it started slipping then.

Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
Adrenaline
AFE stage 2
Super 66 Turbo
4" straight pipe
Modded IDM
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's
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post #5 of 9 (permalink) Old 03-31-2010, 05:57 AM
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Re: What causes auto trans to not "grab"

It's losing pressure. It could be low fluid, loose internal filter, a bad internal leak, a worn out pump, etc.
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post #6 of 9 (permalink) Old 03-31-2010, 06:00 AM
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Re: What causes auto trans to not "grab"

Didn't you have tranny issues in the past?

If so is this a "new" trans?
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post #7 of 9 (permalink) Old 03-31-2010, 07:34 AM Thread Starter
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Re: What causes auto trans to not "grab"

Quote:
Originally Posted by 907DAVE View Post
Didn't you have tranny issues in the past?

If so is this a "new" trans?
Not a "new" one. It was August that it went out last time, so about 7 months and around 5k miles.

Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
Adrenaline
AFE stage 2
Super 66 Turbo
4" straight pipe
Modded IDM
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's
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post #8 of 9 (permalink) Old 03-31-2010, 07:42 AM Thread Starter
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Re: What causes auto trans to not "grab"

Quote:
Originally Posted by Mark Kovalsky View Post
It's losing pressure. It could be low fluid, loose internal filter, a bad internal leak, a worn out pump, etc.
I know you know transmission stuff very well. Not low on fluid, I've checked a million times lately. So going off that, then it is something internal not flowing fluid right. So does that mean that I have fried internal components such as torque converter, clutches etc? If I take it in for warranty they will see that stuff, so I'm more wondering about the TC, and if I should do anything with it or will it be good to go back in as is? Even when it has acted up temp never got above 170ish.

Does the fact that it only does it after the truck has been running for a good amount of time rule any of the possibilities you listed out? I drove it all morning in short trips around town, then it sat for several hours and then I drove on the highway for 2+hrs and had no issues until I got off the highway and was driving in town. Now if I go take it out it will be fine for a while. Seems to take maybe an hour of driving around for the problem to start.

Early 99 Powerstroke
Crew Cab Short Bed Lariat 4x4
SCT Livewire w/ various custom tunes
Adrenaline
AFE stage 2
Super 66 Turbo
4" straight pipe
Modded IDM
Automatic trans: PI Converter, tugger kit
Leveling Kit w/ 35's
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post #9 of 9 (permalink) Old 03-31-2010, 06:20 PM
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Re: What causes auto trans to not "grab"

from what i'm told there is a sealing ring on the output shaft of the pump.If it goes bad or breaks the tq will not lock.Just what i was told.

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