Automatic transmission leaking like a mutha in reverse under load - Diesel Forum - TheDieselStop.com
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99 & up 7.3L Power Stroke Engine and Drivetrain Discussion of the 99 & up 7.3L Power Stroke diesel engine and drivetrain in the 1999-Up Super Duty trucks and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 7.3L Power Stroke engine.

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Old 06-03-2006, 02:09 PM   #1 (permalink)
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Automatic transmission leaking like a mutha in reverse under load

2001 Ford F350 Dually powerstroke

Ok here is the story.

I go to the dealer (stealer) to get the pinion seal replaced as the book calls for a torque spec that I cannot reproduce. I think it was like 400 ft/lbs or something like that.

Anyway I figure while it is in I will get the tranny serviced as it has not been done since I have owned the truck. They do a 'flush' by unhooking the lines to the cooler and running fresh fluid in while sucking the old fluid out.

Ok.. everything seems to be fine. I take the truck and trailer (tag trailer with 3100 pound race car) on a 6 hour trip to southeast GA. Check for leaks at the first gas stop and everything looks good.

Here is where it gets strange. I get to the race track and backup to park the trailer. The tranny proceeds to spew tranny fluid out the inspection plate in front of the transmission. The inspection plate has a little hole (breather hole? or fluid drain hole?) in the bottom of it and transmission fluid just pours out of the hole as fast as it can get out.

Only happens in reverse with a load (trailer and race car).
Does not happen in forward with a load.
Does not happen in reverse with no load.

Help.

Dealer keeps saying nothing wrong - sorry we can't reproduce the problem.

What do I do? This has never happened until the transmission flush.

Thanks for any input.

Todd
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Old 06-03-2006, 04:45 PM   #2 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

mine did the same about 20k ago. i had it it 4H should have had it in 4L [img]/ubbthreads/images/graemlins/shrug.gif[/img] was putting too much pressure on the tranny and boiled the fluid right out, fortunatly the seal re-sealed but then 10k later i was rebuilding the tranny, was told to use 4 low EVERY TIME i back up with a load, have been ever since. mine did do fine for 10k though, then 3rd and overdrive went away, good luck
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Old 06-03-2006, 05:04 PM   #3 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

[ QUOTE ]
I take the truck and trailer (tag trailer with 3100 pound race car) on a 6 hour trip to southeast GA.

[/ QUOTE ]

South Georgia Motor Park?

Just curious, not too much on the tranny...my 97' did that when I overheated it pulling a trailer but I had overserviced it; probably not your issue here.
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Old 06-03-2006, 06:02 PM   #4 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

It was actually more east than south I guess. Roebling Road Raceway.

4L? Do all automatic trannys have that? All I have seen on mine is Reverse. Plus it had never done this before the tranny service.

Any idears?
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Old 06-03-2006, 07:13 PM   #5 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

Only if it has 4 wheel drive. Is the fluid level right? Not over filled? Does it do this while moving or only after you stop? How many miles on your truck?
Joe
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Old 06-03-2006, 07:43 PM   #6 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

135K on truck
Not a 4 wheel drive
Does not do it ever in a forward moving gear.
Only happens when it is in reverse. Although it does keep
leaking until you take it out of reverse and put it back in
a forward gear.
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Old 06-03-2006, 08:05 PM   #7 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

Probably the front seal on the transmission. The flush may have losened up the crude around the seal and let it start leaking. At that mileage it should have already been flushed 3 or 4 times. The only fix I know would be pull the transmission and replace the seal. While you have it out you might want to replace the torque converter with an upgraded one.
Just my .02, Joe
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Old 06-04-2006, 12:25 AM   #8 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

when in rev the trans comands higher pressure and blows out the front pump seal seal backing up under load the factory front pump seal is junk i work for ford and this is still a problem have the seal replaced with the aftermarket pump seal made with the viton rubber
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Old 06-04-2006, 02:40 AM   #9 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

I take it you have to pull the transmission to replace the pump seal?

Does Ford have the pump seal with viton rubber? Or is that something I have to do?


Thanks for all the input so far!
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Old 06-04-2006, 09:10 AM   #10 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

reverse has a taller gear ratio than forward, higer pressure is commanded, but its the heat from all the stock converter slip/added load/reversing that builds extra heat in the converter and relaxes the crappy ford seal even more and the fluid pours out. The "black" seal is an aftermarket piece, any tranny shop should have one. You have to pull the tranny to replace it. Would be an excellent time for a converter upgrade as the stocker is not very efficient or the clutch very stout.
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Old 06-04-2006, 10:58 AM   #11 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

Ok.. Looks like the tranny is gonna have to come out. Is this a shadetree mechanic job or a tranny shop job?

What would be recommended to do to the transmission while it is out?
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Old 06-04-2006, 12:59 PM   #12 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

You never did say if you checked the fluid level. These are classic symptoms of over filling with ATF. Does the fluid smell burnt? If it were me I would check the fluid level, if it ain't burnt you may be ok. I would then install a tranny temp gauge as well as Boost and EGT, you really should have these already, but anyway. I would then install a 6.0 cooler . This is the oil to air tranny cooler out of a 6.0 torque shift tranny. It is over 3X as big as the stock one you have. They can be had on ebay for about a C note, and install is very simple. My tranny temps haven't seen over 160 backing up my 8500lb TT in 90 degree ambient. Good luck.
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Old 06-04-2006, 01:42 PM   #13 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

pan temp and converter temp are not the same, a huge cooler only cools the fluid after it has left the converter, the fluid puking will still happen.
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Old 06-04-2006, 02:20 PM   #14 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

Yeah I checked the fluid and it was low after the spewage. It loses about a quart of tranny fluid during a backup and park it routine. Which usually only lasts about 3 - 8 minutes. 8 minutes being on the extremely long side. So, it loses fluid in a hurry.

Fluid does not smell burnt and it looks like it was poured out of the bottle it is so fresh.
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Old 06-05-2006, 09:16 AM   #15 (permalink)
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Re: Automatic transmission leaking like a mutha in reverse under load

So what is better? Taking it to a tranny shop or the dealer for this work? I'm not too jazzed about the dealers around me. I have taken it in twice and been pretty much screwed over both times. If you recommend a tranny shop which one? Anyone know of a good transmission shop in the birmingham, AL area?

Thanks.
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