Tranny Slip

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Feb 13, 2009 | 02:17 PM

#16

7.3johnsonville

Senior User

Joined: Nov 2007

Posts: 103

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From: Coon Rapids MN

My truck is doing somthing simmilar and wonder about the locking of the converter or the health of it. my transmission was rebuilt 20k ago but the shop was pretty ratty... hope i can maybe get a fix for the slipage i have as well. bump for more info
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Feb 14, 2009 | 12:43 AM

#17

Bubba828

Thread Starter

Junior User

Joined: Dec 2008

Posts: 78

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From: Roseburg, OR

well just to update. the tranny shop confirmed that its toast. so its only a matter of time before its done.

Feb 14, 2009 | 08:17 AM

#18

big poppa

Post Fiend

Joined: Feb 2008

Posts: 10,977

Likes: 5

From: Lancaster, Pa.

Quote:

Originally Posted by Bubba828

well just to update. the tranny shop confirmed that its toast. so its only a matter of time before its done.

Bubba, not that i,m a tranny expert but get a second opinion just to make sure. I,m not bashing the place you took it to but you had the best FTE tranny expert,(s) on here and you owe your truck a second opinion, good luck..

Feb 14, 2009 | 08:42 AM

#19

Mark Kovalsky

Frmr Ford Trans Engr

Joined: Aug 1999

Posts: 24,739

Likes: 2,669

From: SE Florida

Quote:

Originally Posted by vettdvr

I guess the older cars/trucks w/o lockup torque converters just had a shaft from the flywheel to the front pump to make them go

. That would also be no pressure in the TC.

Well, yes, there is a shaft that goes from the front cover of the torque converter to the pump so that the pump is always turning when the engine is running. You're just adding to the impression that you don't know how this stuff works. Why not quit before you're too far behind?

The torque converter is fed from regulated line pressure. Ford limits the torque converter to 120 PSI. But if there is extreme demands on the pump this pressure can fall. If the pump demand gets too high there is a priority valve in the valve body that will cut the feed to the torque converter. When this happens the torque converter has zero pressure. You'll never know that it happened because the torque converter doesn't care. It still operates just fine. When the pressure demand drops the priority valve again allows flow to the torque converter. The converter has to be filled with fluid to operate, it does not need to be pressurized.

Quote:

Originally Posted by vettdvr

Wonder why the 53 caddy had a TC you could take apart? Perhaps to weld a better shaft. Aren't we having fun.

Because they didn't have the technology to make it one piece. That was common in the early 50's. Sheesh. [/QUOTE]

If the trans is slipping and delaying the 1-2 shift it's most likely a burned intermediate clutch. The torque converter cannot cause this problem, regardless of what those that don't know beans about a transmission think.

Mar 2, 2009 | 08:11 PM

#20

Bubba828

Thread Starter

Junior User

Joined: Dec 2008

Posts: 78

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From: Roseburg, OR

well i ended up getting the transmission rebuilt. found a local guy who knows these 4R100's like the back of his hand and was highly recommended. i was able to pull the transmission out myself and he rebuilt it the same day. while taking it apart found that it had been put together wrong in multiple places. clutch on clutch, metal on metal in 2 spots. also there was a check ball that had been placed in the wrong location so fluid hadnt been circulating like it should have been. I ended up finding out who rebuilt it from the preveous owner and it had been the Ford Dealership!! its a ford remanufactured tranny so im sure the dealer just installs the trannys that are sent to them. but it just shows that ford couldnt get it right twice with this transmission. there had only been about 8000 miles on the second transmission.