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4L80/85E Transmissions. 6L90 Transmission Discuss the 4L80/85E transmissions found in the 6.2/6.5L equipped vehicles and Duramax equipped vans. 6L90 discussion.

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Old 08-04-2016, 12:24 PM   #1 (permalink)
Reluctanse
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4L80E temps, hot weather, unloaded

Hi All,

On a couple recent camping trips with the family I'm becoming concerned about tranny temps I'm seeing - but maybe I don't need to be? Anyways wanted to post up my thoughts and see what you guys think about my temps and stuff.

Rig is the '98 suburban in my signature. *EDIT: Just realized my signature is gone.... so 1998 Suburban 2500 4x4 "F" vin, mods include PMD relocation and manual boost controller. Everything else is stock. Loaded up with the family and probably 4-500 lbs of camping gear. Outside temp was in the high 90s and we were in some moderately heavy traffic (slow stop and go). The tranny normally when its this hot out runs about 190* anyways, but we were seeing temps up to 210-220*, either in traffic, or towards the end of a 5 hour drive climbing some moderate hills at around 30-40mph. Engine temps held fine the entire time but the cooling system was definitely working to keep it that way.

I should also add the truck has a stock external cooler, and I recently replaced the filter and the tranny fluid in the pan.

Are these temps normal? Seems too high to me - considering I'm not towing. If I ever were to tow it seems like the trans would be nuked?

Do I have a problem somewhere, or is this normal? Should I investigate a larger external cooler? What about flushing out my fluid and refilling with synthetic?

Thanks,


Last edited by Reluctanse; 08-04-2016 at 12:31 PM.
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Old 08-04-2016, 01:15 PM   #2 (permalink)
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Quote:
Originally Posted by Reluctanse View Post
Hi All,

On a couple recent camping trips with the family I'm becoming concerned about tranny temps I'm seeing - but maybe I don't need to be? Anyways wanted to post up my thoughts and see what you guys think about my temps and stuff.

Rig is the '98 suburban in my signature. *EDIT: Just realized my signature is gone.... so 1998 Suburban 2500 4x4 "F" vin, mods include PMD relocation and manual boost controller. Everything else is stock. Loaded up with the family and probably 4-500 lbs of camping gear. Outside temp was in the high 90s and we were in some moderately heavy traffic (slow stop and go). The tranny normally when its this hot out runs about 190* anyways, but we were seeing temps up to 210-220*, either in traffic, or towards the end of a 5 hour drive climbing some moderate hills at around 30-40mph. Engine temps held fine the entire time but the cooling system was definitely working to keep it that way.

I should also add the truck has a stock external cooler, and I recently replaced the filter and the tranny fluid in the pan.

Are these temps normal? Seems too high to me - considering I'm not towing. If I ever were to tow it seems like the trans would be nuked?

Do I have a problem somewhere, or is this normal? Should I investigate a larger external cooler? What about flushing out my fluid and refilling with synthetic?

Thanks,
Check your cooling stack..
Between trans oil cooler and radiator could have debris. Get a radiator comb and straighten the fins.

The tripping point is around 295*.This will kick the transmission into Hot Mode.
the transmission can handle the heat up to that point.
When it reaches Hot Mode it will set a code from the temp sensor.

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Old 08-16-2016, 09:19 PM   #3 (permalink)
Jess_sr
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How hot is too hot for transmission
temperature. The over temperature on late
model vehicles on average is about 260°F
and above.
Most GM vehicles do not set the over
temperature code until the ATF
temperature is between 284°F and 310°F
depending on the type of transmission.
Most Ford vehicles do not set the
over temperature code until the ATF
temperature is between 300°F and 310°F.
Dodge vehicles do not set the over
temperature code until the ATF
temperature is 260°F or above.
As you can see, the manufacturers do
not consider over heating until at least
260°F
The average car’s thermostat opens

at 190°F. Most electric coolant fans do
not turn on until the engine temperature
reaches 220°F. Therefore, the
transmission temperature will be at least
190°F on most vehicles. It is not unusual
to see temperatures between 220°F and
235°F in the summer time on vehicles that
are hauling heavy loads or pulling trailers.
With the ATF that is being used in
today’s vehicles, these temperatures will
not hurt the fluids or the transmissions.
The additives in ATF and the synthetic
fluids, that some manufactures are using,
can handle these temperatures. So can the
clutch and band materials that are being
used. That is another reason it is so
important to use the manufacturer’s
recommended fluids.
The fluid that the manufacturer
recommends not only has special
additives for the type of clutch and band
material being used, but also additives for
the transmission to handle these high
temperature ranges

The above info was written 10 years ago.
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