What's new
CK5
Register an account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members.

Dual Trans temp guages

chris85

chris85

1/2 ton status
 Premium
Joined
May 16, 2006
Posts
1,320
Reaction score
1,225
Location
vicksburg, mississippi
I’m just getting my rig up and running to where I can do some shakedown. Yesterday, just driving around town my trans temp got to 200 and that’s from the valvebody/ecu sensor. I know it’s recommended to run a sensor to measure the temp in the pan, but my question is does anyone know what the discrepancy between these two values typically is?

Like if the ecu temps say X then the pan temp is approximately Y?

I’m sure eventually I’ll run one to the pan, but I just wondering if there is some kind of approximation that can be made until then.
 
Isn't the ECU reading the pan temp? The switch/sensor assemblies for 4L60 and 4L80 are on the underside of the valve body, which is basically in the oil bath.
 
On both my trucks I put the temp sensor in a tee in the outlet line to the cooler. Most transmissions that line gets fluid straight out of the TC. Which should be the highest temp the trans sees.
 
KirsL said:
On both my trucks I put the temp sensor in a tee in the outlet line to the cooler. Most transmissions that line gets fluid straight out of the TC. Which should be the highest temp the trans sees.
Click to expand...

That's what we do, we know that by the time it goes through the coolers it's a lot cooler than what we're looking at. Ideally you'd read in and out so you know what the trans is picking up and what the hottest oil temp is but that's a lot of monkey motion.
 
So just found this thread

https://ck5.com/forums/threads/4l80e-fluid-flow.268259/

This is saying the valvebody/pan sensor is sensing fluid coming out of the converter. Basically like having a sensor on the output line.

So if this is the point at which the fluid hits it’s highest temperature what temperature should I shoot for? There are plenty of vague graphs out there that say to keep it under 220-200 degrees but none specifying the temp reading location.
 
I know on my dually, even when I towed both rigs on that 40’ gooseneck my trans temps didn’t get over 184
6AD87F83-9676-42B3-A7E3-556C08B07E27.png
 
my one truck build there will be 2 sensors and a flip switch for the 1 gauge . normal will be hot out line temp / flipped will let me see pan temp .

my current truck budget beater has the 1 sensor in the hot line out before the factory rad cooler on my th400 4.10 33" tire combo setup . its in the remote trans filter mount . most of the time she is inline with engine temps . but if workd hard goes up . if i am plowing snow i use 4wd low and she runs much cooler this way over 4wd high .
 
I know this isn’t what you want to hear, but my 4l80 doesn’t even get to 180 unless it’s running in and out of lock up. I’ve seen 200 a couple times exiting off ramps. I think I’ve got a tcc intermittently sticking, but not bad enough to log the sensor yet.

That’s mechanical gauge at my external filter pre cooler as well as ecm indicated.
 
Abusfullofnuns said:
I know this isn’t what you want to hear, but my 4l80 doesn’t even get to 180 unless it’s running in and out of lock up. I’ve seen 200 a couple times exiting off ramps. I think I’ve got a tcc intermittently sticking, but not bad enough to log the sensor yet.

That’s mechanical gauge at my external filter pre cooler as well as ecm indicated.
Click to expand...

Well I’m not too concerned about it. I know the cooler I put in was too small so I got one twice as big to swap in.
 
chris85 said:
Well I’m not too concerned about it. I know the cooler I put in was too small so I got one twice as big to swap in.
Click to expand...
Make sure you go trans line out to radiator then aux cooler, back to trans line in.
 
Fastereddie said:
Right on. I always hear about people bypassing the radiator and that’s a big mistake.
Click to expand...

I did a lot of research on here about that, and though it doesn’t get crazy cold here in the south it can still freeze over pretty good. Cold enough to freeze the gas pumps.
 
chris85 said:
I did a lot of research on here about that, and though it doesn’t get crazy cold here in the south it can still freeze over pretty good. Cold enough to freeze the gas pumps.
Click to expand...
Haha, that’s cold enough for me...
 
You must log in or register to reply here.

Latest Posts

Top Bottom