Downshifting Question

The isx-12 I was in shifted really quickly. After I got used to it I really liked it. Then switching back to slow shifting macks took some getting used to.

 

We have all been where you are at. That's why most of us like to help. Somebody helped us. You will help someone also.

 

When you are upshifting, what RPM are you at when you pull it out of gear, and what RPM is it at when you put it into the next gear? Just use those same RPMs when you downshift.

Unless you have a really low gear in the differential, 1400 is probably too high to start the downshift (especially with the wide gear ratios in an 8LL). Try letting your RPMs drop to just above the engine's torque peak, then bring the RPMs up 400-600 as you slide it into the next gear.

 

Why is it bad to coast in neutral? Sometimes I’ll do it if I’m coming to a stop, or coming down a ramp at a low speed (<20). Are there mechanical dangers to this?

 

Its just considered not being in control of the truck. As to the mechanical aspect, as long as the engine is running and the clutch is released, the countershafts are turning and the oil will be getting thrown around the case/oil pump will be driven.

That's why they pull axles or driveshafts when towing a truck because the countershafts will not spin with the engine off in neutral. It won't get properly lubricated and can take out a transmission pretty quick.

 

What @AModelCat said. Plus. How easy is it to find a gear and get it back into a gear when in neutral if you have to? You may have to come to a complete stop to do so. If you are in a gear already it is much easier to find another one. If rolling to a stop and you must coast just Leave in gear and just release clutch but not touch the clutch brake. As you get closer to stop just put shifter in a gear you need to be in to go.