starting to look at trucks
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 t...
Forum Discussion
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.
