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Old November 17th, 2007, 03:04 PM   #1
nd4spd71
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Default Trans temp gauge

I want to install a trans temp gauge in my 1994 3/4 ton Chevy truck. I have a couple of questions about it though.

1. Where is the best place to mount the temp sending unit? I would assume on the line coming out of the trans, but am not sure about that.

2. What is the normal temp operating range for an auto trans? And what is the danger zone?

By the way the trans is a 4L80E.

Any input would be great. Thanks in advance.
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Old November 19th, 2007, 02:11 PM   #2
Kodiak450r
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you can put it in the oil pan or in the line to the cooler. i prefer to put it in the pan. transmissions like temps below 210. the colder the better. anything above 250 and you start cooking the fluid and hardening seals etc..180-190 is usual temp when not towing for a 4L80.
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Old November 19th, 2007, 02:25 PM   #3
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Originally Posted by Kodiak450r View Post
you can put it in the oil pan or in the line to the cooler. i prefer to put it in the pan. transmissions like temps below 210. the colder the better. anything above 250 and you start cooking the fluid and hardening seals etc..180-190 is usual temp when not towing for a 4L80.
Kodiak is correct. If you want to put it in-line, install it in the uper line coming out of the trans.
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Old November 19th, 2007, 07:55 PM   #4
Mclovin
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Originally Posted by Tranny Tom View Post
Kodiak is correct. If you want to put it in-line, install it in the uper line coming out of the trans.
i thought it was going INTo the cooler ? to see how hot it is before cooling ? but im gona say u are right based on your SN :tonka:

my dodge runs at 100 degrees (verified with scan tool) mines run in line with the trans cooler going INTo the cooler i beleive
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Old November 20th, 2007, 07:36 AM   #5
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i thought it was going INTo the cooler ? to see how hot it is before cooling ? but im gona say u are right based on your SN :tonka:

my dodge runs at 100 degrees (verified with scan tool) mines run in line with the trans cooler going INTo the cooler i beleive
The upper line on the side of the case is the one going to the cooler. You want to know what it is at its hottest point. I apologize if i was not clear.
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Old November 20th, 2007, 08:49 AM   #6
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Thanks guys for the input.
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