spec'ing a shed hauler - axle ratio etc

[Rawze]

(03-06-2025 )jmartin Wrote:  The L9 is now available with a compression release jake, since at least 2021. I agree that an exhaust brake only would barely be worth bothering with.

Based on above advice and running scenarios with a gear ratio calculator, we’re going with 4.33s. Noticing a disadvantage with the Allison is only getting 6 speeds. There are a few scenarios where it would be nice to have a few more choices between 4th and 6th.

Thanks for all the advice.

Unless there is a specific need for it,.. having an auto-s$itter or automatic tranny is a disadvantage in every way vs. a stick on a commercial truck. Lower fuel economy vs. someone who knows how to shift well (as much as 0.7 mpg in most cases), higher long term maintenance costs (xy shifters wearing out, etc.), major repair costs when it wears out, higher engine wear rates (lugging the engine to death in lowest rpm it can use vs. power range), etc.