Changing shift points

Seems to me like Nissan designed a Truck for hauling loads, and thus the shift points are set to minimize hardship on the transmission and engine.

If you want a highway cruiser, then you should purchase a car.

So I guess your answer would be that you don't know. Thanks.

Glenn

It's done electronically, yes it can be done if you can find someone who knows how to reprogram the trans computer. I have no idea if the EFI computer and the trans computer are one in the same now or if they have a separate computer like the older cars did. The Xterra trans computer might be "the same" as far as swapping them out? Again no idea on that one either. Nissan does tend to make their highpo cars with automatics shift fairly late for performance reasons, might have something to do with making it live as well? I'm sure the s/c has a different map as far as line pressure etc as well to keep it from burning up. You might be able to fudge it with a throttle switch adjustment, but that affects the EFI and the line pressure etc as well.

IMHO short shifting doesn't always "save gas", you end up with more throttle opening at lower revs to keep the same accelleration rate. Hate to sound like this but a s/c automatic truck isn't a good choice if fuel milage is a concern!

Oh I understnad completely. It's just that the way I drive 90% of the time I feel like there's an extra 1000 RPM where I do not need the power because I'm not on the throttle much at all. My Charger has a manual-shift automatic tranny so I can shift whenever I want of course. I have a prosthetic leg so although I can work a clucth, I am not very good/quick with it so it is not a convenient/safe option for me. The Xterra shift program seems to work better. It shifts pretty early at low throttle pressure and shifts higher as expected with increasing throttle pressure. I just thought my truck should/could behave the same way.

Thanks for a useful answer.

Glenn

I never heard of any modification to make something shift less aggressive. And I doubt that you're wasting that much gas.

My Axxess was shifting late/hard after I installed new injectors. It seems that the cable that goes from the throttle body to the transmission was a little out of adjustment on my re install. It only took a little to get it to a smoother and lower shift point.

Not sure if your Frontier is the same but its worth a look.

Frank

For the same potential fuel savings you might get from an earlier shift point, keep your tire pressures set as per factory all around, check every week. As little as 3PSI low difference in tire pressure leads to increased rolling resistance and thus less fuel economy.