Transmission leaks when towing - Diesel Forum - TheDieselStop.com
'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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post #1 of 12 (permalink) Old 07-10-2005, 03:39 PM Thread Starter
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Transmission leaks when towing

My transmission (automatic) leaks whenever I pull a trailer (under 7000lbs trailer). The leak is comming out of the bottom of the bell housing area in an almost steady drip/stream. When I unhook the trailer and drive with the truck unloaded the leak stops. Could this be caused by the tranny overheating? I do not have an aftermarket gauge, however the stock tranny temp gauge stays right in the middle. Has anyone had or heard of such a problem?

BTW I am not running my chip anymore. This tranny was rebuilt/replaced by the local ford dealer under warranty at 13,000 miles after 2nd gear went away. I now have 68,000 miles on the truck.

Thanks!

2002 F-250XLT Supercab, long bed, 4x4 shift on the fly, Auto, PSD, Island Blue, born on 8-01 delivered 9/11/01, 3.73 posi, Airaid intake, Isspro guages, Dynomax cat back, Dieselsite 203 T-stat & housing, Fabtech 3.5" leveling kit w/2" rear blocks, 325/70R17 Toyo open country tires, Mickey Thompson classic II wheels.

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post #2 of 12 (permalink) Old 07-10-2005, 04:37 PM
 
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Re: Transmission leaks when towing

if your staying in the safe fluid level and not having to add fluid you my just be puking some fluid out the vent.

A temp gauge would be a good idea.
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post #3 of 12 (permalink) Old 07-10-2005, 04:42 PM
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Re: Transmission leaks when towing

sounds more like a pump seal ,by the way he described the leak.possibly getting overheated,i once had a gm that would leak in the same area only when put in reverse.bought a pump seal and installed.started vehicle,put in reverse backed up and leak was still there [img]/ubbthreads/images/graemlins/crazy.gif[/img].pulled it out again and found the pump was not tight on about 4 of the mounting bolts.installed new pump seal all was good.get a good trans temp guage (never go by the stock one)and have the level checked before you hook back up to the travel trailer.

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post #4 of 12 (permalink) Old 07-10-2005, 04:49 PM
 
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Re: Transmission leaks when towing

I would think a pump seal would leak all the time...towing or no towing.

towing would add just enough heat to expand the fluid a bit more in a tranny that was just slightly overfull to burp it out the vent
as what happened to me in little rock a few days ago that gave me a good excuse to see Brian in Lead Hill
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post #5 of 12 (permalink) Old 07-10-2005, 06:08 PM Thread Starter
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Re: Transmission leaks when towing

This has happened about four times. The first was about 8 months ago and it didn't leak again until I towed a trailer a few days ago (2nd time). When it leaked I checked the fluid level and I was down in the low cold range (hot tranny) so I added about 3/4 of a quart. I have to admit was getting on it a bit then but the total tow was only about 5 miles. I have towed twice since then taking it easy on it and keeping it out of OD. It still leaks but not as bad. Funny thing is it seams to leak a tad more when I back up the trailer.

2002 F-250XLT Supercab, long bed, 4x4 shift on the fly, Auto, PSD, Island Blue, born on 8-01 delivered 9/11/01, 3.73 posi, Airaid intake, Isspro guages, Dynomax cat back, Dieselsite 203 T-stat & housing, Fabtech 3.5" leveling kit w/2" rear blocks, 325/70R17 Toyo open country tires, Mickey Thompson classic II wheels.

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post #6 of 12 (permalink) Old 07-21-2005, 10:19 PM
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Re: Transmission leaks when towing

Me too!

had trans replaced at 90000 last august I pull a 16500 5th wheel. all last winter no problem...then once after pulling up a big hill puked out sig trans fluid when I backed up.

then this summer went on big trip through midwest...high temps. just got back today. probs started in PA turnpike going west. everything was fine when pulling but everytime I stopped I left a trail of fluid drips about 100 ft before I came toa stop. then it just streamed. If I turned off the engine. it stopped almost immediatetly. ended up in canada...no guage...was worrried it was really overheating so I purchased an extra cooler. the folks there unfortunately removed the old one..learned about that in this forum tonite. this did not solve the problem...but now my guage showed that when I slowed down the tranny temp went from about 190 to 210 0r 215 and out came the fluid. matters not if fluid level is at top of hot or bottom of cool. so not just expanding out. I'm taking in tomorrow.

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post #7 of 12 (permalink) Old 07-22-2005, 05:28 AM
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Re: Transmission leaks when towing

Reverse is the worst case for these trannys. There has been many posts of guys Backing their 5th wheel in a spot,, "Up a slight incline" and the tranny temps shot thru the roof! So I would be carefull backing any trailer with a STOCK trans.
As far as pump seal or vent. I would also have to think seal, from where you say it's coming from. The vent is on top of the case....I guess the seal is nearing total destruction and leaks under a little more pressure than normal??? Just a guess.

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post #8 of 12 (permalink) Old 07-22-2005, 06:32 AM
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Re: Transmission leaks when towing

[ QUOTE ]
Reverse is the worst case for these trannys. There has been many posts of guys Backing their 5th wheel in a spot,, "Up a slight incline" and the tranny temps shot thru the roof! So I would be carefull backing any trailer with a STOCK trans.

[/ QUOTE ]Turning the 32' box GN Horse trailer around in our stable parking area is to put it bluntly, challenging. I have to go down a small hill towards the manure spreader/ramp and then back up the hill while turning. I have made it a habit of locking in 4x4 lo after going down the hill in order to reduce tranny temps. Because the surface is mud/sand/gravel, the axles do not bind up and it makes it alot easier backing a 26000# load. I am planning on getting that BTS tranny as soon as the extended warranty expires.

2002 F350 Lariat CC 4x4 Auto 4.10 DRW, DP-Tuner F5 live tuned stock, quiet, 40dd, 40, 60, 80 tow, 80e and 120r, B&W GN, BrakeSmart, 'pooned tank, tank and pre-pump mods, 2 Dahl 100 filter, regulated return, BTS dual HPOP, AC singles with EDM 34 lpm nozzles, AIS, H2e, Spearco 6.0 IC, Hypermax 3.5" dp--> MBRP 4" 304SS exhaust, BTS tranny, 203 T-stat, Chevron ELC, Oilguard bypass with Schaeffer 9000, WranglerNW 200 amp alternator, Nippon-Denso starter, SPA gauges, SteveRacer mods, Hella 80/100W 9007s, Hella Micro DE foglights, 1000FF driving lights, 220W backup lights, Stancor contactor, X-Springs, Bilstein shox, custom bumpers but otherwise stock. Nov 30 '99 build engine with 16 K miles, Fluidampr, Comp Cam 910 springs, Melling LPOP and ARP headstuds but otherwise stock.
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post #9 of 12 (permalink) Old 07-25-2005, 03:42 AM
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Re: Transmission leaks when towing

My tranny is also leaking from the tork converter area/trans inspection cover. After reading some other posts here, I am convinced it is the from pump seal. I spoke to a trans shop - they said it was a common problem. Mine did it the first time the other day when it was about 105 outside. My trans hit the hottest it ever had 180 degrees (x monitor gauge). I rarely tow with this truck and by all means am pretty mellow with this truck. The leak has not really shown up again, I think it will only happen when it gets hot. My trans was replaced by Ford at 40k, I now have 75k on the truck.

The problem with this stupid leak, is that the parts cost about $15 (or less), but you have to pull the trans to replace the seal and assoc parts (I think there is an oring and gasket as well). Trans shop wants $500. I am thinking of doing it myself, but I know it will be a chore to pull the trans and trans case.

Anyone know of a good trans hop in so cal to do this job?

TDS member #49 - 1999.5 (Built 4/26/99) White F350, CC, SRW, LWB, Lariat, AIC, 4R100 (4th transmission before 85k - gotta love this tranny), 6.0 trans cooler, manual shift 4wd, 3 inch leveling kit, KING reservoir shocks, 285-75-16 Bridgestone REVOs, Performance Friction Pads all around, Powerslot Cryo'd rotors in front, CD player, Infinity REF 6800CS speakers (front and rear), Garmin 2610 GPS (hardwired), 40/20/40 leather seats, heated turn signal- TT mirrors, Titan V hitch, weatherguard box, DP Tuner 4 Position chip (love it), AIS intake, Diesel Site CAC Boots, 4" Magnaflow exhaust, Diesel Innovations Up Pipe, gutted EBPV, Non EBPV Turbo Pedestal, X-Monitor. NO STEERING WHEN BRAKES ARE APPLIED!

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post #10 of 12 (permalink) Old 08-02-2005, 10:03 AM
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Re: Transmission leaks when towing

I just got my truck back from the dealer yesterday....See my post above. Diagnosis was exactly what you said...a pump failure...also they replaced the torque converter...I still don't understand why it only happens at extremely high temps....I wonder how many trucks are out there with this problem but it does not show unless towing at high ambient temperatures....My tranny was under warranty so there was no charge...I signed a bill i guess sent in by dealer to ford for 786.00 for the work.

I took it out and immediately hooked up the trailer and worked it till I got the temp up to 225. no leak whatsoever...so I hope and pray this will last awhile. I have about 19000 miles left on the ford warranty...I feel good now the decision I made when replacing my trans 17000 miles ago to get the full 3yr/36000 miles trans work.

Larry
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7.3 99.5 550 Lariat Fontaine conversion, auto leveling airbags, auxillary transferflow midship tank, fiberglass bed,liner, 25K pullrite hitch, Diesel Innovations six way chip,pillar gauges, 4 inch exhaust. SOLD

08 f-450 4X4 LARIAT 4.88 Dark Shadow Gray to match my Mobile Suites fiver. Line-x, 0503 Pullrite 25.5k superfifth hitch, Retrax rollcover, 50 gal transferflow under cover aux tank, aftermarket pioneer avicz2 nav to come, SOLD

2013 F350 Lariat, camper package, Sterling Gray, firestone air bags, Bigfoot slide in camper, 5th wheel parked for awhile
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post #11 of 12 (permalink) Old 08-31-2019, 10:00 AM
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OK, after reading these issues of leaking trannys, I'm compelled to add mine: living in mountainous country, I like traveling the off roads. I have a temp indicator and cooler but the temp goes up to 200 plus and the hydraulics gets pumped out in a steady stream. Any ideas?
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post #12 of 12 (permalink) Old 08-31-2019, 01:45 PM
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Quote:
Originally Posted by edatnile View Post
OK, after reading these issues of leaking trannys, I'm compelled to add mine: living in mountainous country, I like traveling the off roads. I have a temp indicator and cooler but the temp goes up to 200 plus and the hydraulics gets pumped out in a steady stream. Any ideas?
Hello edatnile, just a suggestion— I think you will get more replies and help if you start a new thread (this one is from 2005) in the appropriate grouping (assuming your ‘99 and up 7.3 /
and a 4R100 ? ) There’s a lot of knowledgeable guys on here- Welcome to The Diesel Stop.

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