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Old 10-15-2007, 11:19 PM   #15
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Make sure you have tow/haul activated. I think that's the single best advise you've been given so far. Yes synthetics take more abuse and I would suggest a good Dextron compatible fluid at your next opportunity to change it out.

I tow about 6300lbs...not as much as your 27', but close. You're Caddy is a half ton. You really should have a 3/4 ton for the 27'.

That said, I have yet to hit 200 degrees on my 4L80e on grade at 90 degrees outside ambient air temp (Caddy gets a 4L60e, which is less stout).

From what I have seen, there is not much difference between the 1ton and 3/4 ton trans cooler. Additionally, I have gone this route by adding a second trans cooler on my Chevy sedan. It did help, but the results were marginal at best. The comment that someone said about yanking the trans lines from the radiator is just plain wrong. Why? I did testing doing this...here were my results.

160 degree stat installed. Engine at 185 degrees. Trans temp 175.

Stock 180 degree stat. Engine at 200 degree, Trans temp 175 degrees, same run, same grade. The heat does NOT transfer as much as one might think. The heat is basically there for winter temps.

With my 3/4 ton burb, trans temps stay mostly around 175 to 185 degrees, regardless of outside temp or being connected to the radiator which the truck says is at 210.

Bottom line, make sure you are in tow/haul mode. There are many mods you can do for the Caddys 4L60e trans, most won't solve the issue, may help slightly. I personally think you have the wrong setup for that 27' Classic. You really should be looking at a 3/4 ton with that size and weight...it also could be part of the problem. The truck has 3.42 gears, and is rated at about 78 or 79 hundred lbs. The 27' Classic has a GVWR of 9000lb if the carry capacity is maxed out. Even if it isn't you and say you are at 2000lbs less NCC...you are still way too close to the max that truck is rated at, once you take into consideration passengers, fuel and any cargo. IMHO, you may have a $60K Caddy Albatros, when the $50k GMC or Chevy might hav served you better in 3/4 ton.

As you can tell the 6.2L 400+hp engine isn't the issue.......more than enough power...but gettin' that power to the ground without stress (those 3.42s are not enough) is a whole nuther story.
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Old 10-15-2007, 11:28 PM   #16
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Twink, say it's not so! That big Caddy has the same 4L60E (I'm pretty sure that's what I had - it was a 1/2 ton tranny) that was in my Astro so many years ago? Yeah, I would say that they're not the strongest tranny out there - the V6's would tax them... as did my 350 V8 transplant I did.
Hope they made them stronger from when I had them!

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Old 10-15-2007, 11:32 PM   #17
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Quote:
Originally Posted by Silvertwinkie

I tow about 6300lbs...not as much as your 27', but close. You're Caddy is a half ton. You really should have a 3/4 ton for the 27'.

.
The Cadillace ESV has a towing capacity of 7800lbs. Well within the 5800lb UBW of a 27' CCD FB. Should be safe, easy towing with properly setup WD/swaybars.


........Scott
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Old 10-15-2007, 11:34 PM   #18
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Been there and done that with a 1996 Impala SS with a heavily modded 350 LT1 and the 4L60e, which I also played with. The 3.73s did the trick compared to the granny gears that it came with, but the bottom line was that the trans on paper could handle something like 13k in weight. The 4L80e was rated higher. Problem is when you are yanking a heavy wide body load with less than 3.73s, the trans gets unhappy and you can get what this user is describing....had the same issue. Messing with the pumpkin (which I did) is not for the timid or faint of heart. It's major open heart surg. You either need to know someone who knows what they are doing or try to swap the gears yourself. Even then, you still run the risk of issues. Something about a factory built pumpkin (differential) just seems to be the right way to go after my exp and many I've spoken with.

Caddy is a great truck, no question and the engine is a monster...but like I said, getting those horsies to the ground, is a whole nuther issue when you have a 8000-9000lb paperweight behind it.
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Old 10-15-2007, 11:35 PM   #19
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Quote:
Originally Posted by Wayward
The Cadillace ESV has a towing capacity of 7800lbs. Well within the 5800lb UBW of a 27' CCD FB.

........Scott
...and what happens when he fills it up?

My point is that the issue is bigger as he moves forward. Is he always going to tow it empty?
I gave the suggestion of tow/haul for his empty tow, but when he fills it, he is for sure going to go beyond the rated specs, without question which is ill advised by GM.
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Old 10-15-2007, 11:40 PM   #20
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Quote:
Originally Posted by 3Ms75Argosy
Twink, say it's not so! That big Caddy has the same 4L60E (I'm pretty sure that's what I had - it was a 1/2 ton tranny) that was in my Astro so many years ago? Yeah, I would say that they're not the strongest tranny out there - the V6's would tax them... as did my 350 V8 transplant I did.
Hope they made them stronger from when I had them!

Marc
The ESV specs say: "Hydra-Matic 6L80 heavy-duty 6-speed automatic transmission with electronically controlled shifts plus Driver Shift Control manual mode, Performance Algorithm Shifting (PAS) and tow/haul mode"
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Old 10-15-2007, 11:41 PM   #21
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I think thay I would weight that 27FB, ready to roll. I'll bet she goes
+/- 8,500#. That a good ways out of my comfort zone teamed with a half ton truck. The escalade has the engine juice to do the job, but doesn't have the brakes, wheels/tires, suspension, or frame.
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Old 10-15-2007, 11:43 PM   #22
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Quote:
Originally Posted by Silvertwinkie
...and what happens when he fills it up?

My point is that the issue is bigger as he moves forward. Is he always going to tow it empty?
I gave the suggestion of tow/haul for his empty tow, but when he fills it, he is for sure going to go beyond the rated specs, without question which is ill advised by GM.
Agreed - he should not add on more than 1 ton of gear, fluids and people. And make sure that it is distributed according to the both the CCD's and Caddy's GVWR.
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Old 10-16-2007, 12:22 AM   #23
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Quote:
Originally Posted by evsjr
I was bringing my brand new 27 FB Classic home with low milage 2007 Escalade ESV. Rig was empty and well within 14,000 lb. total weight rating of Escalade. When pulling long uphill at 91 degree temp., transmission temp passed 200 deg F. I pulled over for cooldown. Is this normal and any suggestions on how to acieve better transmission cooling? There is a factory installed trans cooler but does not look very robust. Thanks for any help. evsjr
Hi, I wouldn't worry about the 200 degrees trans temperature. Was that temp in the red on your gauge? What does your owner's manual say about your trans temp gauge? [safe zone] I would be more concerned about going over the limits of your Escalade. Some of us don't carry enough stuff to max out our trailer's GVWR, but other than bringing your new trailer home, I don't think you or anyone else out there tows with an empty, bone dry trailer; Not to mention an unloaded tow vehicle.
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Old 10-16-2007, 12:36 AM   #24
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IMHO, 200 degrees is really the max I would want to see. Also, I re-read this thread and there is a significant difference between fully synthetic and blended synthetic motor oil. I have tried to go fully synthetic where I can and have used Amsoil (and no I don't work for them). In that case, the oil might take more abuse, but the plates, and such in the trans beyond a say 225 degrees won't for long. I basically do it because I think there is a benefit, particularly in shock heat....then I look at my old 1980 Oldsmobeater Delta 88 that I changed fluids in regularly with conventional oils and at 170k, burned no oil and ran like a top......and though it never towed more than 3000lbs, it did tow regularly....of course I replaced the trans at 80k, and starters a number of times.......and water pumps.
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Old 04-26-2008, 10:01 AM   #25
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More escalade issues with a '27?

Hello EVSJR,

I too have a 2007 Escalade esv & am curious regarding your towing experience. Having towed small trailers with the towing mode, I know this greatly influences the drive & makes decelerating and braking that much easier. It seems as though this combo is on the borderline, from what I read in the posts. Were you driving with the tow mode? Did you have any issues with braking? Have you towed much since your home drive?

We are a family of 6 (4 small girls) & we need the largest possible trailer. We would love a newer '27 classic, yet am looking at refurbishing a 1980s model to get to the '30 range as well. We plan on front twins & adding bunks. I will also be towing just occasionally & mainly in Florida -nice & flat. In terms of travelling light, it is absolutely impossible, for I seem to travel at all times with at least one ton of baby wipes!

I know that TVs come & go -as I was reminded on the forum here, yet for everyday use, I really love my escalade & for lots of children, it can't be beat!

Any assistance would be greatly appreciated! Thank you, Helen
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Old 04-26-2008, 10:52 AM   #26
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My .02 cents.
I just had an auxillary tranny cooler and gauge installed.
My transmission mechanic(who runs his own shop) suggests getting the largest tranny cooler possible. He also suggested to keep the tranny temps below 200.

I went with a 20,000 btu cooler and a digital tranny temp gauge. It lowered the tranny temp by about 30-40 degrees. Temps now run about 140-150 without trailer.
I'm anxious to try it out now that camping season is about here.
Don
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Old 04-26-2008, 02:20 PM   #27
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Most of the heat in a tranny is going to come from the torque converter. Having the temp between 150 and 185 is IMHO the sweet spot. You can put synthetic oils in all day long and if you get well beyond 200 degrees, the oil, though still good, won't matter too much cause the trans internals will start to warp and degrade. At the very least trans life will be diminished. In GM land, newer trucks that go over 200 degrees, not sure what the actual cutoff is, the computer will put the truck into "limp mode" until the trans temp drops to a safer temp. The key though is not to allow it to get that high if at all possible.

I would guess that my current trans cooler in my 04 3/4 ton burb is the same or around the same as what is found in the Caddy being talked about here.

Again, using tow/haul mode, locks the torque converters sooner than later and adjust shift point and slows the transmission from hunting gears freq.

I just go back from a trip from the Louisville area where there is a very steep grade that is about a mile long. I had the truck in tow/haul and kept it in 2nd gear as well. I noticed that my trans temp went up about 25 degrees in the uphill tow. Still well below 200, I would guess that if you plan heavy mountain towing that a larger trans cooler or an additional trans cooler, is not a bad idea, regardless if you have a 1/2 ton or larger. Much over 200 degrees is not a good place to be for a trans.
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