[BiGG T33]

Does the 400 rpm bump appply to all or most trucks when downshifting?

another way of saying this....can i use this in all trucks?

[golfhobo]

Originally Posted by Sp33dbump

Does the 400 rpm bump appply to all or most trucks when downshifting?

another way of saying this....can i use this in all trucks?

Well, I haven't driven all that many "trannys," but I would say it is about the same. Point is.... you can't "nail" a 400 rpm bump perfectly every time anyway!

The trick is to NOTICE what the top end of your RPM's are when upshifting (in any truck) and then BUMP to that point as a general rule when downshifting.

If you are going a bit fast in road speed, you may need to EXCEED that point in order to downshift. If you are just cruisin' up to a light, it will take much LESS!

You have to LISTEN to the engine, and you have to "relieve" the tranny of the LOAD!

Another way of saying this is, yeah.... the PRINCIPLE is the same for all tranny's. (that I know of)

[kc0iv]

Originally Posted by Sp33dbump

Does the 400 rpm bump appply to all or most trucks when downshifting?

another way of saying this....can i use this in all trucks?

The simple answer is NO.

Even driving the same truck shift point will change moment to moment. While you might determine a 400 RPM bump is normal such things as how heavy your load is, are you going up hill/down hill or what gear you are in all effects your shift point.

Now change trucks and you have different set of variables.

Shifting be it up-shifting or down-shifting only comes by doing it. There isn't such a thing as one thing that meets all variables.

kc0iv

[mudpuddle]

The 400 rpm bump will be for a specific truck setup. A nine speed is different from a ten speed is different from a thirteen is different from an eighteen, etc.

If you are going downhill it will be different than level ground. If you are going up hill it will be different. If you are loaded it will vary from empty. When you are bumping the rpm's in a downshift you are matching the road speed to the engine speed and all these things affect that match.

You will quickly learn how to do these things by ear and no longer have to look at the tach. It gets much easier with experience.

[BiGG T33]

Thanks this helps me out!


Be Safe