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1987 - 1996 F150 & Larger F-Series Trucks 1987 - 1996 Ford F-150, F-250, F-350 and larger pickups - including the 1997 heavy-duty F250/F350+ trucks

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  #1  
Old 09-06-2008, 11:01 PM
LoxBoy LoxBoy is offline
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transmission seal

i have a 1990 f-150 and ive had the truck for a year and a half. it has an automatic 4speed with OD. about a month ago i blew out the transmissin seal wile pulling a trailer. i had it replaced and 2 days ago it blew again. i dont know how i haven't pulled anything since the last time. i went to go to the store and i noticed tranny fluid everywhere. please help
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Old 09-06-2008, 11:21 PM
danr1 danr1 is offline
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Front seal? E4OD?

If it is you probably have a bad clutch fan clutch causing the tranny to over heat. Probably didn't need a new seal to start with.

It is also possible the tranny is reaching the end of its life if it is in fact overheating but I would try everything within reason to make sure it is kept cool before I threw in the towel on it.
One other thing I'd do is check for any codes it may have regardless of the CEL ever being on. It could still have tranny error codes stored without the light ever coming on.

If not a E4OD post the tranny you have and the seal that leaks on it.....
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1994 F250 RC 5.8L E4OD 4x4 3.55
1995 F250 SC 7.5L E4OD 4x4 3.55
1997 F350 RC 5.8L ZF 4x4 3.55
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Old 09-06-2008, 11:25 PM
LoxBoy LoxBoy is offline
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im pretty sure its the E4OD and its the rear seal that leaks
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Old 09-06-2008, 11:40 PM
danr1 danr1 is offline
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Oh well then I'd check out the output shaft bearings and yoke to see if the shaft has lots of play or the yoke has groves or a nick or bur or something damaging the seal.

Carefully removing without further damage, and then inspecting the seal may lead you to the problem depending on what you find wrong with it.
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1994 F250 RC 5.8L E4OD 4x4 3.55
1995 F250 SC 7.5L E4OD 4x4 3.55
1997 F350 RC 5.8L ZF 4x4 3.55
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Old 09-06-2008, 11:47 PM
LoxBoy LoxBoy is offline
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alrite yea ill check that and i was wondering, if i had to get mine rebuilt or replaced is it worth it to get a heavier duty tranny? sumone told me to get a c6
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Old 09-07-2008, 09:24 AM
njtinman2 njtinman2 is offline
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a c6 you loose overdrive
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Old 09-07-2008, 09:29 AM
danr1 danr1 is offline
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The E4OD is a C6, a fully electronic controlled, O/D version.

A 90 would have one of the first versions of it, you be better off with a 95 or newer version or yours rebuilt to bring it to that spec.

Is this a 2 or 4 wheel drive truck?
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1994 F250 RC 5.8L E4OD 4x4 3.55
1995 F250 SC 7.5L E4OD 4x4 3.55
1997 F350 RC 5.8L ZF 4x4 3.55
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Old 09-07-2008, 01:07 PM
LoxBoy LoxBoy is offline
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its 2 wheel drive
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Old 09-07-2008, 04:42 PM
northern 7.3 northern 7.3 is offline
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definitly sounds like a driveshaft/yoke problem. does it have a vibration?
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Old 09-07-2008, 05:07 PM
LoxBoy LoxBoy is offline
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no but i think the output shaft is loose because it moves. how would i fix that?
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Old 09-07-2008, 05:58 PM
danr1 danr1 is offline
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Quote:
Originally Posted by LoxBoy View Post
no but i think the output shaft is loose because it moves. how would i fix that?
How much play?

The output shaft should hardly have any play in it at all. The seal would be able to make up for a little play but not much.

I'm no tranny expert, far from it, but looking at a service manual for the E4OD, the two wheel drive version it looks like the extension housing can possibly be removed and the output shaft bearing can be replaced with the tranny in place in the truck. I'd check with a tranny shop and see what they say if it has lots of play in that shaft.
If the tranny seams fine in every other way, other then the leaking fluid there it may be worth a reasonable cost to have it repaired. Unless you think you might tackle the job yourself, then looks like its a gasket and a bearing or two to doctor it up.

Myself I'd probably do it myself, that is if a tranny shop verified it could be done that way and depending on how much they'd charge to do it.

The manual I have is not the best and doesn't show it but there must be a carrier bearing in the front area of the extension housing supporting the outboard end of the output shaft. Just forward of the yoke spline area for the drive shaft?
Must be self evident to replace it as it's not shown anywhere in the manual how to do so.
Of course I'm guessing here based on a little common sense and on how things are built. Can't have a shaft with a bearing at just one end?
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1994 F250 RC 5.8L E4OD 4x4 3.55
1995 F250 SC 7.5L E4OD 4x4 3.55
1997 F350 RC 5.8L ZF 4x4 3.55
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  #12  
Old 09-07-2008, 09:18 PM
njtinman2 njtinman2 is offline
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there is most likely a bronze bushing in the tail shaft.
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  #13  
Old 09-07-2008, 10:09 PM
danr1 danr1 is offline
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Quote:
Originally Posted by njtinman2 View Post
there is most likely a bronze bushing in the tail shaft.
Yes, I found a exploded view of the extension housing and it shows/lists a bushing just inside the rear seal. 4x2 model, Part# 7A034, shows it available as a separate part. (according to the manual I have)

So if the driveshaft's yoke drifts around loose in the hole when inserted in the tail shaft that bushing is probably worn down.

Based on that checking for output shaft play with the yoke removed is not a correct test, sorry bout that.

I see nothing preventing removal of the extension housing to replace it if needed. Does not look like a difficult repair at all.
However probably best if a press is used when removing the old bushing and installing the new one. A bfh may not be the best way to go about it! lol
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1994 F250 RC 5.8L E4OD 4x4 3.55
1995 F250 SC 7.5L E4OD 4x4 3.55
1997 F350 RC 5.8L ZF 4x4 3.55
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  #14  
Old 09-07-2008, 11:04 PM
LoxBoy LoxBoy is offline
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alrite ill try all that. thanks yall, big help. im only 16 and dont know alot especially trannys so thanks alot.
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Old 09-07-2008, 11:04 PM
 
 
 
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