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
4x4ord wrote:
Does your reasoning work on engines?
1. Reducing the number of cylinders in an engine increases the stress on the engine components.
2. Increasing stress increases wear.
3. Therefore a 6 cylinder will wear out faster than an 8 cylinder.
Yes this fact does work on engines, but not in the way you are talking about. High load at too low of an rpm (aka lugging) puts a lot of stress on engine internals similar to how a high load at a low rpm puts more stress in the driveline.
All three pickup truck diesel engine manufacturers found this out the hard way when they switched from fixed geometry turbos to VG turbos. Ever notice how all three had head gasket issues the first few years after having a VG turbo? GM with the LLY, Ford with the 6.0L and Cummins with the 6.7l. Too much timing, fuel and boost at low rpms creates a lot of cylinder pressure which equals blown headgaskets or even worse bent rods.
This generally does not happen as easily on a fixed geometry turbos at low rpms because it is not creating a lot of drive pressure or boost like VG turbos do. All three had to reconfigure their fuel mapping(tuning) to decreasing timing along with turbo boost modification at low rpms and/or increase the head bolt and gasket strength to solve the issue. Same makes had it worst than others.
