The KidWagon

[KidWgn]

Something else may be going on there. My trans temp with the stock cooler has never gone over 205, when not towing, in the same climate.

What is the engine coolant temp when your trans is 223? Is your fluid and filter fresh? Cooler fins clear? Do you have the oil cooler also? Electric fans working properly?

I can't imagine the differences in the front grill openings between a Tahoe and Yukon making that much of a difference

EDIT: I have had a Diablo tune installed since day one of having this rig. It may have the fan on/off temps come on a few degrees cooler than stock, which I'm sure effects trans temp

What gears are in yours, how do you drive, and what stall do you have?

I have a 3200 circle d stall in a brand new transmission, with a new filter and Amsoil fluid, with 3.08 gears. The 308’s create a LOT of downshifting.

 

[gooffeyguy]

What gears are in yours, how do you drive, and what stall do you have?

I have a 3200 circle d stall in a brand new transmission, with a new filter and Amsoil fluid, with 3.08 gears. The 308’s create a LOT of downshifting.

Stock trans, stock stall, stock 3.42 gears and a 6.2l AWD XL at 500lbs heavier. I currently have a Derale stacked plate cooler that is a bit taller than the OE cooler and I've never seen trans temps over 210. I just got home from being out and it stayed pretty much 170ish while driving down the highway.

Would a higher stall converter cause more heat?

 

[KidWgn]

Stock trans, stock stall, stock 3.42 gears and a 6.2l AWD XL at 500lbs heavier. I currently have a Derale stacked plate cooler that is a bit taller than the OE cooler and I've never seen trans temps over 210. I just got home from being out and it stayed pretty much 170ish while driving down the highway.

Would a higher stall converter cause more heat?

A higher stall, by nature, generates more heat as it slips.

You have the benefit of a 6.2 and shorter gearing to help keep the trans from up and down shifting so much.

My truck didn’t have the auxiliary cooler at all, just the version that is integrated with the radiator.

A stacked plate design will always cool better than tube and fin.

 

[gooffeyguy]

A stacked plate design will always cool better than tube and fin.

Yup, that's why I installed it. Takes up half the space of a TruCool 40k and is rated same BTUs. It is about 2" thick though.

Your truck not having an auxiliary cooler and just the radiator tank one would be one reason that explaind the higher temps (223*) that you've seen.

 

[KidWgn]

Yup, that's why I installed it. Takes up half the space of a TruCool 40k and is rated same BTUs. It is about 2" thick though.

Your truck not having an auxiliary cooler and just the radiator tank one would be one reason that explaind the higher temps (223*) that you've seen.

Which Derale do you have? The only 2 I see on their site are rated for 14,000 BTU. The TruCool 40k is rated for 45,000 BTU

Trans Cooler Kits

Trans Cooler Kits. Read more

derale.com

 

[gooffeyguy]

Which Derale do you have? The only 2 I see on their site are rated for 14,000 BTU. The TruCool 40k is rated for 45,000 BTU

Trans Cooler Kits

Trans Cooler Kits. Read more

derale.com

It's a 10000 series. Think it's the 51978 or the 52578

 

[KidWgn]

It's a 10000 series. Think it's the 51978 or the 52578

Found it! It is almost literally half the size. Wow. Not quite the same BTU (37,000 vs 45,000), but I’d imagine that unless you’re towing HEAVY, it likely won’t make a difference.

Seeing that my TruCool is dropping me down to 160 at the peak, I think I could actually get away with the 10-row Derale to keep the fluid 160-180°

 

[KidWgn]

Been toying with how short of gears I want, so I made a little Excel sheet. I'm really thinking 4.11 is going to be the way to go. First gear is going to be a tire-fryer, but that's okay with me

With a 32.1" tall tire (285/45r22), that puts 70 mph in 6th gear at 2018 RPM
With a 30.7" tall tire (275/40r22), that puts 70 mph in 6th gear at 2110 RPM

 

[KidWgn]

It’s been a week. I’ve yet to see 170° on the trans temp, and the ambient temps here have been mid 90’s. Photo is after my 21 mile drive to work, ROMPING on it, trying to see how hot I could get it.

I think it’s safe to say it works! It almost works too well. I think I’d have been okay with a 34k, and probably even a 24k. I went with the 40k because it uses 3/8 inverted flare fittings instead of a brazed-on 3/8 hose barb, meaning I can convert to AN fittings later.

To whomever it was that said that a 3200 stall would produce more heat than "even a 40k" could relieve...

@Foggy

Motor mounts are seperate from trans install... You've got quite the list..
Prob just wait on those.
I highly doubt that they will honor any warranty with an aftermarket HP High Stall
Torque Converter.. 3200 stall (from what I read) is a really high stall for a 6k lb
truck. It will create way more heat than even a true cool can handle (unless you live
where it's always cold/cool)
Unless you are operating in the high rpm range all the time, you'll want something
around a 2000 stall... Factory is 1600 rpm... so use that as comparison.
The thing you want/need in a 6L80e TC is a "better" lockup clutch... That's what fails

 

[KidWgn]

Can’t remember if I posted a side shot on the 22’s yet.