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Old 10-23-2015, 09:06 PM   #81
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The converter is what makes most of the heat unless it is locked up.
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Old 10-24-2015, 08:23 AM   #82
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Quote:
Originally Posted by Learjet View Post
Why would you not want the converter to lock up? That is a good way to overheat your transmission.
I learned something. Also got a little concerned that my 'plan' wouldn't work.

With a 3:31 rear towing my upcoming purchase of a 27' Hyperlite my plan was to barely use 6th gear on the open road.

I was concerned about the constant locking and unlocking of the clutches in the Torque Converter (TC) and about the constant down-shifting from 6th to 5th and back up. Which, in my experience is fairly common on the older trannies and leads to them going up in smoke.

Turns out that --

6R80 Specs & Ratios - F150 Hub
6R80 Specs & Ratios
It features torque converter lockup capabilities in all 6 gears

BT:
Hope that's true because I don't believe I will be able to handle 6th gear lockup with all that resistance behind me
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Old 10-24-2015, 01:05 PM   #83
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ah finally some information that makes sense!
I towed ( yes past tense just bought a 2015 Titan) with a 2002 chev avalanche and pulling a 2011 coachman catalina 24FBS the trans temp was running 210 - 215 across indiana with 85 degree ambient. I was wondering why everyone else is running temps so low. the avalanche of this era had HD cooling for trailering BUT did not have the aux trans cooler it had a bigger cooler in the rad. I also saw that chart and thought I was cooking the trans slowly, now with this discussion i feel a little better about the trailering thing.
I used a scangauge 2 for trans readings cause the stock engine coolant gauge would go up 25 - 35 degree before showing anything on the dash and it freaked me out.
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Old 10-26-2015, 11:25 PM   #84
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Originally Posted by The Big Toe View Post
I learned something. Also got a little concerned that my 'plan' wouldn't work.



With a 3:31 rear towing my upcoming purchase of a 27' Hyperlite my plan was to barely use 6th gear on the open road.



I was concerned about the constant locking and unlocking of the clutches in the Torque Converter (TC) and about the constant down-shifting from 6th to 5th and back up. Which, in my experience is fairly common on the older trannies and leads to them going up in smoke.



Turns out that --



6R80 Specs & Ratios - F150 Hub

6R80 Specs & Ratios

It features torque converter lockup capabilities in all 6 gears



BT:

Hope that's true because I don't believe I will be able to handle 6th gear lockup with all that resistance behind me

It doesn't show what your tv is but I have the 3.31 ratio in my Eco work truck and towed my 9000 pound crossroads with it from BC to Calgary. It had no problem holding 6 th on the flats on cruise control. GCW was 14,900, rated at GCWR15,100. Have to say it towed it better than my 2500 sub with a 7.4 L.


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Old 10-27-2015, 07:15 AM   #85
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it's amazing what these eco's can do...especially with 3:31 gears....seems those pulls on TC1 were long and steep....you dont say how slow you got or how hot and what rpm's....just curious....actually my real question is....do you feel the motor was laboring anywhere.
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Old 10-27-2015, 07:55 AM   #86
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It doesn't show what your tv is but I have the 3.31 ratio in my Eco work truck and towed my 9000 pound crossroads with it from BC to Calgary. It had no problem holding 6 th on the flats on cruise control. GCW was 14,900, rated at GCWR15,100. Have to say it towed it better than my 2500 sub with a 7.4 L.


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I have a 2013 F150 with the V8. I'm putting supersprings and a Hellwig sway bar on it. The Supersprings are already on it. The Sway bar is supposed to be here tomorrow..

Yes, the EcoBoost has some serious oomph but I understand from those that have towed with both that the dropoff is very little in the Coyote V8.

I'm going to find out
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Old 03-03-2020, 10:51 AM   #87
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I assume by drop off you mean speed. I had a coyote and found it was a great engine but around 60 mph / 100 kph it was sluggish particularly on grades and much worse the steeper they got. I have a 3.5 now and find on hills it is much more responsive. I'm not a fast driver but it drives me nuts not to be able to maintain a reasonable speed on hills without winding the engine up to 4500 + rpm.
Otherwise the coyote is a great engine and being a V8 guy all my life it was hard to make the change. By the way my trailer was 5600 lbs dry and empty.
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Old 03-03-2020, 10:54 AM   #88
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Am I correct in thinking the 2019 f150 3.5 has a 3.55 rear end?
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Old 01-11-2021, 07:54 PM   #89
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Depends....not all of them
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Am I correct in thinking the 2019 f150 3.5 has a 3.55 rear end?
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Old 06-07-2021, 09:17 PM   #90
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Depends....not all of them


Mine does but my friends is 3.73
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Old 06-14-2021, 02:30 PM   #91
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I tow with ‘13 Silverado 1500 6 speed. Going up long, steep grades towing my 3000# trailer here in the Sierra mtn’s my tranny hits 215*. Should I put an aux. trans cooler on it?
Also, would a free flowing muffler help? I ask because a local muffler shop said the stock muffler has 12# back pressure and the Magnaflow they recommended has 3# back pressure and it would make a big difference in the tranny temps.
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Old 06-15-2021, 09:59 PM   #92
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Towed 8000+ on hilly curvy 2 lane blacktop with with 6R80 gen 1 3.5 Eco this past week. Coming home ambient temps were 90-93 with 65% humidity. Towed in manual mode, cruise set on 54. Mostly in 4th gear which is slightly lower ratio than 1:1. Shift down to 3rd on hills. 15psi boost at times. Tranny never got over 203.
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Old 06-16-2021, 04:05 PM   #93
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I tow with Ď13 Silverado 1500 6 speed. Going up long, steep grades towing my 3000# trailer here in the Sierra mtnís my tranny hits 215*. Should I put an aux. trans cooler on it?
Also, would a free flowing muffler help? I ask because a local muffler shop said the stock muffler has 12# back pressure and the Magnaflow they recommended has 3# back pressure and it would make a big difference in the tranny temps.
In my opinion, no. I tow with a 2012 Yukon XL Denali and have made significant upgrades to the cooling system, including a fan-forced Derale transmission cooler. I often see temps on steep climbs over the mountains of 235ļF pulling a 7,000 lb camper. Your Silverado already likely has the factory external transmission cooler and 215ļF is perfectly fine for the 6L80E. In my opinion having studied this issue to death, it would be a waste of money in your case.
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Old 06-16-2021, 04:12 PM   #94
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Thanks to all of you. Iím feeling much better about my tranny situation.
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Old 08-22-2021, 05:34 PM   #95
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That chart was wrong 20 years ago and it's wrong today-

(2nd post down)
https://www.silveradosierra.com/tran...ot-t12797.html


That chart does not allow for the vast improvements of base stocks, etc., and other improvements made in the last 20 years.
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Old 08-22-2021, 05:49 PM   #96
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Originally Posted by VR51 View Post
I tow with Ď13 Silverado 1500 6 speed. Going up long, steep grades towing my 3000# trailer here in the Sierra mtnís my tranny hits 215*. Should I put an aux. trans cooler on it?
Also, would a free flowing muffler help? I ask because a local muffler shop said the stock muffler has 12# back pressure and the Magnaflow they recommended has 3# back pressure and it would make a big difference in the tranny temps.
There is no muffler that has any effect what so ever on a transmission.

Furthermore any power increases put into a vehicle of any kind only serve to likely raise the temp of engine and trans. For the most part the efficiency of eternal combustion engines is rather fixed. So adding power generally means adding more fuel so more fuel burned means more heat created.

Too bad the simpletons who say and feel other wise just couldn't use their heads and think.
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Old 08-22-2021, 11:10 PM   #97
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Originally Posted by NJBreeze View Post
There is no muffler that has any effect what so ever on a transmission.

Furthermore any power increases put into a vehicle of any kind only serve to likely raise the temp of engine and trans. For the most part the efficiency of eternal combustion engines is rather fixed. So adding power generally means adding more fuel so more fuel burned means more heat created.

Too bad the simpletons who say and feel other wise just couldn't use their heads and think.
Exactly and well said. A tranny temperature of 215ļ towing over a mountain pass in the summer is just fine and perfectly normal. Today's transmissions and engines are computer montored and will warn you if something gets too hot. Fluids and equipment used today are much better that what was used 20 to 30 years ago.
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