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
ShinerBock wrote:
Is this driver error? There are arguments for both sides, but I, like the OP, choose to change the gears myself based on what I am pulling. However, there are many out there that don't and just let computer do all the work. These are the people will generally have transmission clutch issues later on.
I'd call that design error - the input side of the transmission should always be sized for the max tq output of the engine.
Here're some charts I made a while back, 45 mph grade @ near full throttle. The 3.31 truck does it in 4th, the 4.30 truck does it in 6th:
The tq input with both gears are the same. In fact, the 3.31 is a bit lower, purely a fluke of course. At another speed the 4.30 might be a hair lower.
Point is, rear end ratio makes zero difference in RV application. In a commercial under-speed case, it may be difference because they're purposely lugging the engine down to 1100 rpm cruise. Whereas we're agreeing to lock out 9th/10th so both trucks cruise the same.
