3:31 Gearing
Looking into the possibility of a new to me TV. I just looked at a 2012 F250 with a 6.7 and 3:31 gears. What I would like to know is if anyone here tows with this set-up and how it works. I realiz...
Forum Discussion
I'm going to go at this only this one last time. I've got 3.55 gears and 20" wheels. If I'm towing my little rv down the highway at 65 mph I know the engine needs to produce roughly 130 HP.
I have the option of locking out one or both my overdrive gears. So I can run the engine at:
2620 rpm in 4th
1960 rpm in 5th
1525 rpm in 6th
Lower gears are always better so I should have gotten an f450 with 4.30 gears but at least I have the option of locking out both overdrive gears to make things easiest on my truck. How many gears should I lock out?
Say I hit a 4% grade and my truck is holding 65 mph in 4th gear at 2620 rpm. I notice right beside me is an f450 pulling an identical trailer to mine. I do the math and discover he's going up this hill in 5th gear at 2570 rpm.
Now say the hill gets a little steeper oh boy the f450 is starting to loose speed so I back off the accelerator just a touch to slow down with him. At 50 mph the F450 downshifts and his engine revs to 2675 rpm, and he starts to accelerate. I floor it to try to keep up and my truck drops to third gear and I'm running at 2675 rpm....Now we are neck and neck both of us with our foot to the floor. We pass a sign on the side of the highway and it says 7% grade.
Should I say boy I wish I had bought an f450 or does the "best" gear ratio for towing depend on the weight of my trailer?
I have the option of locking out one or both my overdrive gears. So I can run the engine at:
2620 rpm in 4th
1960 rpm in 5th
1525 rpm in 6th
Lower gears are always better so I should have gotten an f450 with 4.30 gears but at least I have the option of locking out both overdrive gears to make things easiest on my truck. How many gears should I lock out?
Say I hit a 4% grade and my truck is holding 65 mph in 4th gear at 2620 rpm. I notice right beside me is an f450 pulling an identical trailer to mine. I do the math and discover he's going up this hill in 5th gear at 2570 rpm.
Now say the hill gets a little steeper oh boy the f450 is starting to loose speed so I back off the accelerator just a touch to slow down with him. At 50 mph the F450 downshifts and his engine revs to 2675 rpm, and he starts to accelerate. I floor it to try to keep up and my truck drops to third gear and I'm running at 2675 rpm....Now we are neck and neck both of us with our foot to the floor. We pass a sign on the side of the highway and it says 7% grade.
Should I say boy I wish I had bought an f450 or does the "best" gear ratio for towing depend on the weight of my trailer?
