Tranny Bypass valve? - Ford Powerstroke Diesel Forum

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post #1 of 19 Old 07-26-2010, 03:09 AM Thread Starter
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Tranny Bypass valve?

My tranny temp in the last 6 months started rising slowly, eventually it hit 210-220. It takes about 20 minutes of around town driving to reach 190-205. I just had a 6.0 cooler installed. The 6.0 cooler keeps the temp around 190-205. Before this past 6 months it never rose above 140-150. I just turned 88,000 miles. I should have had my shop install a new bypass valve when they did the cooler. My question is can I replace the bypass valve myself in the driveway and does anyone have a part# and pic of what it looks like. My mechanical skills are minimal but trying to learn. Thanks.

2003 7.3 F350 Ext. Cab 4x4
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6.0 Tranny Cooler
Marinco Mod
AFE Stage II
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New X codes with Bilsteins
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post #2 of 19 Old 07-26-2010, 03:28 AM
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your valve is shot they should have replaced it when they did the cooler duh...
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post #3 of 19 Old 07-26-2010, 04:38 AM Thread Starter
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yup thats what i thought. thanks

2003 7.3 F350 Ext. Cab 4x4
Gauges
4" MBRP Turbo Back
6.0 Tranny Cooler
Marinco Mod
AFE Stage II
Zoodad Mod
Warn Hubs
N-Fab side steps
New X codes with Bilsteins
Red-Head steering box
Powdercoated Oil Pan
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post #4 of 19 Old 07-26-2010, 04:50 AM
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Looks like a section of tubing. Easy to do in the driveway. Not sure of the #. You can get 'em online.

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post #5 of 19 Old 07-26-2010, 06:08 AM
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yeah u can do it in the driveway no prob. check out dieselsite.com they have what you need i think it was about 60 bucks.
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post #6 of 19 Old 07-26-2010, 06:51 AM Thread Starter
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yeah. i did a search and found it on dieselsite. before i put the 6.0 cooler on my shop talked me into putting on a Perma Cool auxillary cooler with the stock cooler. That worked for a little while but then quit. I just went out to look at the truck and I think they stiil have the Perma Cool still hooked and are running that inline with the 6.0 cooler. Should I un hook the Perma Cool and just run the 6.0 and the new bypass valve. Thanks

2003 7.3 F350 Ext. Cab 4x4
Gauges
4" MBRP Turbo Back
6.0 Tranny Cooler
Marinco Mod
AFE Stage II
Zoodad Mod
Warn Hubs
N-Fab side steps
New X codes with Bilsteins
Red-Head steering box
Powdercoated Oil Pan
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post #7 of 19 Old 07-26-2010, 07:53 AM
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thats up to you. from what i hear, the 6.0 cooler is more than enough. i would leave your coolers the way they are and just replace the bypass. drive the truck for a while 100 miles or so, and see what your trans temps are. if they are still on the high side, then maybe that perma cool cooler is pluged or damaged. but with a good bypass valve and the 6.0 cooler you should never see temps around 140* upto about 180* if your working it. i have a tru cool inline with my stock and pullin my camper with air running im hangin right around 165* driving and abround 185* in trafic.
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post #8 of 19 Old 07-26-2010, 12:45 PM Thread Starter
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Im going to replace the bypass valve and go from there. Hopefully that fixes it. thanks again

2003 7.3 F350 Ext. Cab 4x4
Gauges
4" MBRP Turbo Back
6.0 Tranny Cooler
Marinco Mod
AFE Stage II
Zoodad Mod
Warn Hubs
N-Fab side steps
New X codes with Bilsteins
Red-Head steering box
Powdercoated Oil Pan
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post #9 of 19 Old 07-26-2010, 12:59 PM
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cool..post an update with your findings
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post #10 of 19 Old 07-26-2010, 01:12 PM
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You could also delete the bypass either by braising it closed or removing it and installing some delete spacers.

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