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...
Forum Discussion
RoyJ wrote:blt2ski wrote:
Many of you are also forgetting about the tranny gears.
That should be a sticky for any rear end discussion.
My old Dodge V10 has a 2.45 1st gear ratio, that's nearly as tall as 3rd on a 10R140! I have a 3.54 rear end. It would take a 6.23 rear end to match a modern F350 with 3.31 diffs.
Let's ask ourselves, if you bought an HD pickup 20 years ago, with a 6.23 rear end, would you honestly say: gee, this rear end is way too TALL, I'll burn up the tranny towing with it!?
A 4.30 F350 would be like by old Dodge with 8.10 diffs - heck, do they even make that? Even military Rockwells don't go that short IIRC
Deepest ratio I ever saw was 8.30 gears. If anything, the driver wished he had something deeper.
New F-750s have a 7.17 optional with the V10 and tall tires.
