Tranny or TC
Thread Starter
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Mountain Pass
Joined: Jan 2003
Posts: 140
Likes: 0
From: Tucson US
Tranny or TC
HELP, I need the experts on the board to chime in
01 F250, 4x4, PSD, 3.73 gears, 110K on the clock.
When the truck is cold everything is right with the world. However, on a hot afternoon, (95+, hey I'm in Southern AZ) After the truck gets warmed up the tranny temps start to get around the 170-180 mark (not towing) and the EGTs are running around 600. Both seem to be higher than normal, and the tranny sounds to be running at a higher pitch. Sometimes on the hiway it sounds like the tranny is "hunting" for the right gear (cruise on, level hiway).
At 67 the RPMS are still right at 2000, no varying on them at all If I turn the OD off and wind it up to 50 or so and then turn the OD on the tranny sounds like it always did ( a low sound). I'm think TC not locking up...??
Any and all ideas/suggestions greatly appreciated
01 F250, 4x4, PSD, 3.73 gears, 110K on the clock.
When the truck is cold everything is right with the world. However, on a hot afternoon, (95+, hey I'm in Southern AZ) After the truck gets warmed up the tranny temps start to get around the 170-180 mark (not towing) and the EGTs are running around 600. Both seem to be higher than normal, and the tranny sounds to be running at a higher pitch. Sometimes on the hiway it sounds like the tranny is "hunting" for the right gear (cruise on, level hiway).
At 67 the RPMS are still right at 2000, no varying on them at all If I turn the OD off and wind it up to 50 or so and then turn the OD on the tranny sounds like it always did ( a low sound). I'm think TC not locking up...??
Any and all ideas/suggestions greatly appreciated
Postmaster
Joined: Jul 2006
Posts: 3,754
Likes: 1
From: Indianapolis
If your TC isn't locking up, you'd see the rpms rise and fall with acceleration or deceleration. As far as hunting, this may be off base, but check your battery cables- if you're cable are corroded and you're getting intermittent valtage to the PCM, that may make it run screwy. AT least, that's what my tranny guy told me when I dropped 3 grand to have mine rebuilt at 160k.
Unfortunately for us PSD owners, the tranny effectively isn't built to the task of handling that much torque. There may be a few trannys out there at 200k or so, but I do know alot die between 110-150k miles.
Unfortunately for us PSD owners, the tranny effectively isn't built to the task of handling that much torque. There may be a few trannys out there at 200k or so, but I do know alot die between 110-150k miles.
Thread Starter
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Mountain Pass
Joined: Jan 2003
Posts: 140
Likes: 0
From: Tucson US
Mongo
Thanks for the reply, I'll check out the cables tommorrow. I recently changed out the batteries, so I'll double check the cables . However, the cable idea poses another question. If the cables are loose, bad, etc, wouldn't the "hunting" be all the time not when everything gets warm?
I'll let you know if I find out anything on the cables. At least I got SOMEONE to finally reply to a question I posted on the forum.
Thanks
Thanks for the reply, I'll check out the cables tommorrow. I recently changed out the batteries, so I'll double check the cables . However, the cable idea poses another question. If the cables are loose, bad, etc, wouldn't the "hunting" be all the time not when everything gets warm?
I'll let you know if I find out anything on the cables. At least I got SOMEONE to finally reply to a question I posted on the forum.
Thanks
Postmaster
Joined: Jul 2006
Posts: 3,754
Likes: 1
From: Indianapolis
You got me there buddy- I didn't think mine were loose, but they were corroded enough to cause intermittent power to the PCM. This I would say is probably not the issue, but it's a thing worth looking at. I hate tranny issues!!
Thread Starter
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Mountain Pass
Joined: Jan 2003
Posts: 140
Likes: 0
From: Tucson US
Well checked all the cables for any sign of corrosion but didn't find any (after all it is a AZ truck). Only thing I found that might be giving me problems was the small wire from the gas pedal area that goes to the tranny. It was caked with mud so I took it off and cleaned it up. Unforntunately, today still had the same problem. Any other ideas??
Thanks
Thanks
Posting Guru
Joined: Jul 2003
Posts: 2,210
Likes: 2
It sounds like your engine cooling fan is running because it needs to cool the engine. If the engine RPM does not change then the trans is not shifting or unlocking the torque converter.
There's nothing wrong here, so don't fix anything.
There's nothing wrong here, so don't fix anything.
Thread Starter
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Mountain Pass
Joined: Jan 2003
Posts: 140
Likes: 0
From: Tucson US
Casey
Thanks for the idea of the cooling fan. Just that this summer is the first time its done this and I've had the truck in AZ for the last 5 summers and I'm doing more hiway driving than in the past so I figured it would be getting more air, Do you think aux cooling fans would be worth it?
Thanks for the idea of the cooling fan. Just that this summer is the first time its done this and I've had the truck in AZ for the last 5 summers and I'm doing more hiway driving than in the past so I figured it would be getting more air, Do you think aux cooling fans would be worth it?
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