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starting to look at trucks

MR_MAC
Explorer
Explorer
I'm in no hurry, but looking at used (2016 and up) F150's, looking at eng. size and wondering what would be best a 3.5 Ecoboost or a 5.0 L V8 . to pull a 7000lb trailer (TT) I think I"m leaning towards the V8, to pull over hills in Maine.

Thanks Rob
ROBERT L MC INTYRE
55 REPLIES 55

valhalla360
Nomad III
Nomad III
Terryallan wrote:
valhalla360 wrote:
Terryallan wrote:


so you are saying. They should only make ONE rear gear ratio? Wonder why they still make lower gears, and rate them to tow so much more? It's a puzzle.


Not sure how you came up with that?

The 10speed means you have a gear ratio available that matches what the rig needs to what the engine produces.

With the old 3 speed transmissions, you often wound up having to drop down to a gear that was too deep, so the engine would be lightly loaded but screaming at high RPM when towing. A deeper rear-end could allow you to run in the higher gear and keep the engine better loaded at lower RPM. (This assumes you are within ratings with either rear-end...no one is suggesting towing beyond the ratings). Of course when not towing, the truck winds up running higher RPM and less efficient. And even with the deeper rear-end, it still didn't always match up well to power needs.

With the 10speed, those issues largely go away. For a given situation, the truck may pick a different gear if the rear-end is changed out but the overall gear ratio will be nearly identical.

Only reason you might need a deeper rear-end is to boost the ultimate towing capability but the discussion presumes he isn't over the tow rating and it is about drive-ability.


I just go by the rating for the different gears. and YES they make a huge difference, Especially up, and down mountains, and starting from a stop. that is one of the reason for the lower gears. Another is keeping the engine in it's power band. Still a puzzle.

If you had ever seen the difference in gear ratios as they run. you would better understand the difference, between a 3.73, and a 3.05. I see it every day. It is what I do.


Nope, I'm familiar...and in the old days of 3 speed transmissions (even the 4 speed to a lesser extent) it made a world of difference for driveability...with 10 speed, just not a big deal.

Again, the ratings are about maxing out the capability...if you exceed the rating for the 3.05...of course it will have issues and going to a lower gear is an option to solve that...but if the trailer is within the 3.05's ratings, no you won't gain much with a modern transmission by swapping out the rear-end.
Tammy & Mike
Ford F250 V10
2021 Gray Wolf
Gemini Catamaran 34'
Full Time spliting time between boat and RV

Terryallan
Explorer II
Explorer II
valhalla360 wrote:
Terryallan wrote:


so you are saying. They should only make ONE rear gear ratio? Wonder why they still make lower gears, and rate them to tow so much more? It's a puzzle.


Not sure how you came up with that?

The 10speed means you have a gear ratio available that matches what the rig needs to what the engine produces.

With the old 3 speed transmissions, you often wound up having to drop down to a gear that was too deep, so the engine would be lightly loaded but screaming at high RPM when towing. A deeper rear-end could allow you to run in the higher gear and keep the engine better loaded at lower RPM. (This assumes you are within ratings with either rear-end...no one is suggesting towing beyond the ratings). Of course when not towing, the truck winds up running higher RPM and less efficient. And even with the deeper rear-end, it still didn't always match up well to power needs.

With the 10speed, those issues largely go away. For a given situation, the truck may pick a different gear if the rear-end is changed out but the overall gear ratio will be nearly identical.

Only reason you might need a deeper rear-end is to boost the ultimate towing capability but the discussion presumes he isn't over the tow rating and it is about drive-ability.


I just go by the rating for the different gears. and YES they make a huge difference, Especially up, and down mountains, and starting from a stop. that is one of the reason for the lower gears. Another is keeping the engine in it's power band. Still a puzzle.

If you had ever seen the difference in gear ratios as they run. you would better understand the difference, between a 3.73, and a 3.05. I see it every day. It is what I do.
Terry & Shay
Coachman Apex 288BH.
2013 F150 XLT Off Road
5.0, 3.73
Lazy Campers

TurnThePage
Explorer
Explorer
Based on the Ram forums I frequent, the 8 speed transmission made the axle ratio much less important. I think the various ratios Ford offers with the 10 speed (mated to nearly 400HP) are probably mostly a sales gimmick.
2015 Ram 1500
2022 Grand Design Imagine XLS 22RBE

valhalla360
Nomad III
Nomad III
Terryallan wrote:


so you are saying. They should only make ONE rear gear ratio? Wonder why they still make lower gears, and rate them to tow so much more? It's a puzzle.


Not sure how you came up with that?

The 10speed means you have a gear ratio available that matches what the rig needs to what the engine produces.

With the old 3 speed transmissions, you often wound up having to drop down to a gear that was too deep, so the engine would be lightly loaded but screaming at high RPM when towing. A deeper rear-end could allow you to run in the higher gear and keep the engine better loaded at lower RPM. (This assumes you are within ratings with either rear-end...no one is suggesting towing beyond the ratings). Of course when not towing, the truck winds up running higher RPM and less efficient. And even with the deeper rear-end, it still didn't always match up well to power needs.

With the 10speed, those issues largely go away. For a given situation, the truck may pick a different gear if the rear-end is changed out but the overall gear ratio will be nearly identical.

Only reason you might need a deeper rear-end is to boost the ultimate towing capability but the discussion presumes he isn't over the tow rating and it is about drive-ability.
Tammy & Mike
Ford F250 V10
2021 Gray Wolf
Gemini Catamaran 34'
Full Time spliting time between boat and RV

Terryallan
Explorer II
Explorer II
valhalla360 wrote:
Terryallan wrote:

Kind of proved my point. The lower rear gear gets you to the needed RPM for max torque.

As for the other statement about the 10 speed. Ford's engineers determined the tow capacity is always higher with the lower geared rear. No matter how many gears it has. A truck will NEVER be rated for max tow, with a 3.15 rear gear. It's in the book, and is no more than physics.


If it's rated to tow north of 7k lb, the Ford Engineers have determined, it's fine.

This is different from the old days of 3 speed transmissions where there often wasn't a good gear to match engine output, so you really needed the deep rear end if you wanted to tow much of anything otherwise you lived in 1st gear with the engine near redline if you wanted to go more than 35mph. The 10speed allows the truck to pick a gear that matches the engine output, so unless you are pushing over the tow limits, the rear end isn't a big deal.


so you are saying. They should only make ONE rear gear ratio? Wonder why they still make lower gears, and rate them to tow so much more? It's a puzzle.
Terry & Shay
Coachman Apex 288BH.
2013 F150 XLT Off Road
5.0, 3.73
Lazy Campers

Snomas
Explorer
Explorer
I just started towing w/my f150 5.0L 10 speed and it is easy to keep the rpm's up w/ the 10 speed. Our truck is also a daily driver at home and of course on the road. My TT gvwr is 6500 and I have no problem towing 55 to 60 MPH on long grades and I keep the RPM's up to 3-4K. The engine runs cool w/ the bigger radiator. I get 10.3 towing and 23 w/ out at 75MPH. Love my 1/2 ton for daily driving and that's why I didn't get a rougher riding 3/4 ton.
2006 WINNEBAGO ASPECT 29H Ford E450 Super Duty
2018 F150 Lariat Crew Cab, Coyote 5.0 L RWD

librty02
Explorer
Explorer
MR MAC wrote:
I'm in no hurry, but looking at used (2016 and up) F150's, looking at eng. size and wondering what would be best a 3.5 Ecoboost or a 5.0 L V8 . to pull a 7000lb trailer (TT) I think I"m leaning towards the V8, to pull over hills in Maine.

Thanks Rob


Rob,
Is the trailer you're going to pull 7k empty or 7k loaded ready to hit the road?
If 7k empty I would look for a 3/4 ton...if 7k loaded the F150 would be my choice. The trailer I have is 30ft 7k loaded and its a perfect match for my truck....would I go heavier and bigger with it no I would go 3/4 ton then. I've put over 40000 towing miles on my 2 ecoboosts and they are the best mountain towing gasoline engine you can get IMO. I had an 11 5.0 for 3 months after a couple pulls with that thing I wanted to dump it fast as that Naturally Aspirated engine screamed and sucked the fuel at 8mpg on a great day. The same route with the 3.5 Eco I get 10.5 on a great day and 9.5 on the worst day. In 40k I have yet to tow my 7k trailer and get below 9.5 mpgs with either of my 3.5 Eco's. On 1200 mile trips I avg between 10 and 10.5. Would I ever own a 5.0 V8 again...NEVER...It's either 7500lbs or less with an 3.5 Eco or I'm stepping into the 3/4 or 1 ton with anything over 7500k. Oh and btw my 18 Eco is spec'd to tow 13000lbs too. Payload is your limiting factor with any vehicle.
2011 FORD F-150 FX4 CREW CAB ECO...
2018 Ford F-150 Max Tow Crew 6.5 3.5 Eco...
2013 Keystone Passport 2650BH, EQUAL-I-ZER 1K/10K

Jebby14
Explorer
Explorer
I love my f150. its a 2016 XLT super crew, 4x4, 5.0 bought new at the start of 2017 for a killer price (I was looking for a newish used it ended up being cheaper) Minimal bells and whistles but lots of what I needed. get the most payload you can it will be your limiting factor. Both the coyote and the 3.5 Eco boost are very capable motors and will do fine. One thing I don't like is my 331 rear end. would rather 355 but I do get great mileage. real world differences are minimal between the 2 motors. the eco gets slightly better mileage and makes a bit more power (under boost)but has more moving parts..... I would buy another of my truck in an instant. As a comparison I bought my wife's explorer a year later and it doesn't meat my f150 at anything. It burns more fuel, costs more to buy and insure, has less room and the 7th seatbelt it comes with is seldom used. The ONLY reason it wasn't another f150 is because the lot where she works makes the truck cumbersome.
Q: Whats brown and sticky???

A: A Stick....

valhalla360
Nomad III
Nomad III
Terryallan wrote:

Kind of proved my point. The lower rear gear gets you to the needed RPM for max torque.

As for the other statement about the 10 speed. Ford's engineers determined the tow capacity is always higher with the lower geared rear. No matter how many gears it has. A truck will NEVER be rated for max tow, with a 3.15 rear gear. It's in the book, and is no more than physics.


If it's rated to tow north of 7k lb, the Ford Engineers have determined, it's fine.

This is different from the old days of 3 speed transmissions where there often wasn't a good gear to match engine output, so you really needed the deep rear end if you wanted to tow much of anything otherwise you lived in 1st gear with the engine near redline if you wanted to go more than 35mph. The 10speed allows the truck to pick a gear that matches the engine output, so unless you are pushing over the tow limits, the rear end isn't a big deal.
Tammy & Mike
Ford F250 V10
2021 Gray Wolf
Gemini Catamaran 34'
Full Time spliting time between boat and RV

Grodyman
Explorer
Explorer
Well, I have a 2017 F150 3.5 Eco/3.55 rear. I pull a Keystone Passport Ultra Light 153ML, weights no more than 5K lbs. fully loaded. 3.5 Eco gets about 7-8 MPG towing. No better than my SuperDuty dually with 6.2/4.30 combo I sold. What it is good at is empty MPG.

Gman
2017 F150 CC/5.5' 4x4 3.5 Ecoboost/3.55
2018 Passport Ultra-Lite 153ML

Terryallan
Explorer II
Explorer II
bartlettj wrote:
I think 8k pounds for a F150 is a bit heavy as you are going to be light on truck payload if you plan to take passengers in the cab. There's not much of a price premium on used 3/4 ton trucks unless you go diesel.


which leads to the question. Is that 7000 loaded, or 7000lb dry? An important thing to know.
Terry & Shay
Coachman Apex 288BH.
2013 F150 XLT Off Road
5.0, 3.73
Lazy Campers

OleManOleCan
Explorer
Explorer
bartlettj wrote:
I think 8k pounds for a F150 is a bit heavy as you are going to be light on truck payload if you plan to take passengers in the cab. There's not much of a price premium on used 3/4 ton trucks unless you go diesel.


I've towed with the 3/4 ton F-250 6.4 Turbo Diesel. It was a beast. I loved it.
I've towed with the 6 cyl. 3.5 Ecoboost. Also a beast if it's geared to tow.

The 3/4 ton 6.4 Ford Diesel is my all time favorite.
Towing 8500 lbs, I had to check my rear view Elephant Ear Mirrors to see if my trailer was still behind me.

My EB is good. but it's not a big Turbo Diesel... I still like to drive the EB.

bartlettj
Explorer
Explorer
I think 8k pounds for a F150 is a bit heavy as you are going to be light on truck payload if you plan to take passengers in the cab. There's not much of a price premium on used 3/4 ton trucks unless you go diesel.

BC4277
Explorer
Explorer
Go to ytube and look up "Fast Lane Trucks". They do a lot of towing & mileage test on most trucks. I think they did a comparison test with the EB vs the 5.0. While they are not very scientific, they are consistent in there testing and fun to watch.
2017 Freedom Express 192RBS
Fastway E2 Trunion Hitch
2003 Tundra 4.7

Where ever I am,
is where I'm supposed to be

Terryallan
Explorer II
Explorer II
valhalla360 wrote:


I wouldn't get too hung up on rear-end ratios...with the newer 10speed transmissions, the truck can select an appropriate gear to convert HP to torque at the wheels.

PS: If you do want to look at torque, you need to look at the torque curve not just the peak number. A slightly bigger maximum torque doesn't prove anything if the engine can't get up to the RPM where it generates the max.


Kind of proved my point. The lower rear gear gets you to the needed RPM for max torque.

As for the other statement about the 10 speed. Ford's engineers determined the tow capacity is always higher with the lower geared rear. No matter how many gears it has. A truck will NEVER be rated for max tow, with a 3.15 rear gear. It's in the book, and is no more than physics.
Terry & Shay
Coachman Apex 288BH.
2013 F150 XLT Off Road
5.0, 3.73
Lazy Campers