3.31 gears at 40,000 lbs gross.
Just to give a bit of a feel for how different gear ratios would behave while towing I locked out 10 then 10th and 9th then added them back again while travelling on a straight stretch of road w...
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BTW, didn't watch the video until just now. Love the Ford dash setup!
But what stood out was it appears that either 9th or 10th gear is effectively useless at the speed you were driving (about 63-64mph).
Less than 100rpm split between gears at almost "highway" speeds doesn't really have nay practical benefit IMO. That calcs to about a 200rpm split at around 80mph, still not enough to write home about except to say you have the "most" gears!
I'm not one to bash on the "more is better" theory when it comes to trans gears, but unless there is a benefit down lower in the ratios somewhere that the 10th gear could have a greater benefit, seems like 9, or even 8 speeds is about all that is practical for a light duty diesel truck.
And in other news, your 34" tires have about a 33" effective rolling diameter. Based on a known final drive ratio, known trans gear ratios and the rpms and speed observed in the video. Not that it matters, just an observation.
Common thing really. My "37s" roll at approx effective diameter of 35" and the half worn "35s" I have on another truck roll closer to 33" (with low/no load, "comfortable" pressure in the tires for both trucks).
But what stood out was it appears that either 9th or 10th gear is effectively useless at the speed you were driving (about 63-64mph).
Less than 100rpm split between gears at almost "highway" speeds doesn't really have nay practical benefit IMO. That calcs to about a 200rpm split at around 80mph, still not enough to write home about except to say you have the "most" gears!
I'm not one to bash on the "more is better" theory when it comes to trans gears, but unless there is a benefit down lower in the ratios somewhere that the 10th gear could have a greater benefit, seems like 9, or even 8 speeds is about all that is practical for a light duty diesel truck.
And in other news, your 34" tires have about a 33" effective rolling diameter. Based on a known final drive ratio, known trans gear ratios and the rpms and speed observed in the video. Not that it matters, just an observation.
Common thing really. My "37s" roll at approx effective diameter of 35" and the half worn "35s" I have on another truck roll closer to 33" (with low/no load, "comfortable" pressure in the tires for both trucks).
