Trans temp sending unit replacement?
Thread Starter
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Freshman User
Joined: Nov 2008
Posts: 39
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From: wisconsin
Trans temp sending unit replacement?
Hi y'all,
The trans temp guage on my '08 F-350. V-10 started acting erratically, and the wrench icon popped up on the display. i crawled under the truck to look for the sending unit and it's lead. i assume that i found the lead. it is encased in a corrugated sleeve, and appears to be a vaccuum type tube and boot connector? the boot still had a small round gray cap plugged into it. it appears that the cap was never glued (go figure) upon assembly. i have tried to reach up on top of the trans to find the sending unit to figure out the best angle of attack. i can barely touch it with the tip of my finger. going with mechanical guages is out of the question at the moment, so i'm wondering can it be driven any distance this way, AND any schmooze tricks that anyone has developed to get at the sucker without dropping the cross member or exhaust????
The trans temp guage on my '08 F-350. V-10 started acting erratically, and the wrench icon popped up on the display. i crawled under the truck to look for the sending unit and it's lead. i assume that i found the lead. it is encased in a corrugated sleeve, and appears to be a vaccuum type tube and boot connector? the boot still had a small round gray cap plugged into it. it appears that the cap was never glued (go figure) upon assembly. i have tried to reach up on top of the trans to find the sending unit to figure out the best angle of attack. i can barely touch it with the tip of my finger. going with mechanical guages is out of the question at the moment, so i'm wondering can it be driven any distance this way, AND any schmooze tricks that anyone has developed to get at the sucker without dropping the cross member or exhaust????
Frmr Ford Trans Engr
Joined: Aug 1999
Posts: 24,739
Likes: 2,669
From: SE Florida
Uh, no, don't do that. You have found one of the three speed sensors. Changing any of those will not help you.
The temperature sender is inside the pan. Once the pan is off it is easy to change the sender. It is called the TFT (Transmission Fluid Temperature ) sensor.
You can drive the truck the way it is. It may go into a protect mode.
The temperature sender is inside the pan. Once the pan is off it is easy to change the sender. It is called the TFT (Transmission Fluid Temperature ) sensor.
You can drive the truck the way it is. It may go into a protect mode.
Thread Starter
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Freshman User
Joined: Nov 2008
Posts: 39
Likes: 0
From: wisconsin
So that line that I found is a speed sensor? located on top of the tranny, back by where the transfer case bolts up? is that a pain to replace? I can drop the tranny pan and replace the temp sensor with no problem. at 134K it needs a service job anyway.
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