7.3 auto sometimes leaking, acting funny..questions..? - PowerStrokeNation : Ford Powerstroke Diesel Forum
 
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post #1 of 8 (permalink) Old 08-12-2012, 05:16 PM Thread Starter
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7.3 auto sometimes leaking, acting funny..questions..?

2000 F450 XLT 7.3 auto crew cab dual wheel utility body with hydrolic dump bed 17k gvw 140k miles

Truck runs and shifts beautifully but then on a hot day last week (95 deg, 80+% humidity) I drove, loaded and dumped the truck about 8 times in an 8 hour day..the last load it started leaking trans fluid pretty good from what looks to be the drip nipple thing in the pan...so I thought it may be the seal had gone bad..?
Let it sit and cool off over night, topped it off with fluid and it didn't leak a drop for abut a week of using it..but now it has started to chug/stahl out when I put it in reverse..the rpms go up and down without being on the pedal, it almost feels like its going to stahl out...but all other gears still shift so perfectly smooth..no hard shifts, no slipping, etc..
But then again on another 90+ degree, loading, dumping, and just running around town it started leaking again pretty good..parked it..cooled off for the night, didn't leak again...untill yesterday ...so what is going on with this intermittent leaking..is this the sign that the trans seal has gone bad and needs replacing? Does the system just need a flushing..? I took it to 3 local shops and none of them want to touch it..haven't had a serious problem with any of my diesels to need a serious mechanic, since a good one is very hard to find in my area...any suggestions?
Its also not throwing any CEL

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post #2 of 8 (permalink) Old 08-12-2012, 07:21 PM
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Re: 7.3 auto sometimes leaking, acting funny..questions..?

The problem is the torque converter hub seal is getting too hot. When it's hot it gets soft and can't hold. Once it cools off it will work again.

Check all your coolers, air/water/trans for stuff blocking the airflow, like leaves/bugs/small animals. If there isn't enough airflow it will get hot.

Another thing to consider is if you have a transmission cooler in the radiator. The first half of 2000 did not have one. That would have a BIG effect on the torque converter temperature. So would changing the air to oil trans cooler for one from a 6.0L truck.

Mark
Former Ford Automatic Transmission Engineer

“The good thing about science is that it's true whether or not you believe in it.” ― Neil deGrasse Tyson
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post #3 of 8 (permalink) Old 08-13-2012, 10:32 AM Thread Starter
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Re: 7.3 auto sometimes leaking, acting funny..questions..?

Gotcha..I'll check it out..I was thinking I possibly needed a new or bigger trans cooler, didn't know that some in 2000'didnt have em..
I'll check and see..I believe it should be toward the bottom of radiator, pretty visible if it's there..?

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post #4 of 8 (permalink) Old 08-13-2012, 02:08 PM
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Re: 7.3 auto sometimes leaking, acting funny..questions..?

Yes, it is easy to see. Either there are two 3/8" lines running to the bottom tank or there isn't.

Mark
Former Ford Automatic Transmission Engineer

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post #5 of 8 (permalink) Old 08-16-2012, 01:15 AM Thread Starter
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Re: 7.3 auto sometimes leaking, acting funny..questions..?

I don't think it has one..Build date 5/00

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post #6 of 8 (permalink) Old 08-16-2012, 02:29 AM
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Re: 7.3 auto sometimes leaking, acting funny..questions..?

It has the cooler in the radiator. Ford started installing them in either February or March, 2000. I forget which one.

Mark
Former Ford Automatic Transmission Engineer

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post #7 of 8 (permalink) Old 08-18-2012, 03:55 PM Thread Starter
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Re: 7.3 auto sometimes leaking, acting funny..questions..?

Ok thanks...
It started slipping bad and it was only 80deg out and truck wasn't being ran at all really that day...local trans shop says its tired and needs a rebuild..
$2600 in house rebuild or $500 if I bring them a trans..

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post #8 of 8 (permalink) Old 08-29-2012, 10:00 PM
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Re: 7.3 auto sometimes leaking, acting funny..questions..?

My 99 7.3 blew 2 front seals out snowplowing- different years- I installed a singlepass trans cooler about 10" x 10" infront of the radiator and have not had a repeat seal failure - two years and running. this is a daily user work truck.
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