Changing Transmission Shift Points

is it possible to change the transmission shift points? ive heard about people doing it to other vehicles and i was wondering if i could do it in my jimmy

If I remember right, the Hypertech Power Programmer III can do it for you...

thanks man!

Be warned, though, if you use the engine tuning that they have, you're going to have to run premium fuel...

The hypertech has a 87 octane formula as well, but I had to run 89 with their programming in my Bravada.  I did keep the programmer and reset it to factory before I traded it in.

Other than a programmer like that, they can be changed with a custom tune as well, but this will require sending your PCM to be programmed, but gains can be higher than the handheld programmers.

According to the website, the programmer for his year, doesn't have the dual octane settings...
 
part # 370202

Ah yeah, mines for 98-00.  That's right.

I bought mine, mainly because I knew I was going to bigger tires (smaller for winter, lol) The engine tuning is just a benefit (and yeah, it runs a lot farther on a tank of gas on mid-grade, than regular... though the current tank I have, I'm at 300km, and 1/4 tank...)

hmmm the premium fuel thing sucks lol
i just wanna change my shift points

I'm 95% sure that you can change the shift points, without adjusting the engine performance, but you might want to shoot them an email just to make sure, and take a look around ebay for that model...

My model #30024 would allow for changes to shift points without using the programming.  Also allow for larger tires, firmer shifts, speed limiter, gear ratio, and...  I can't remember, but I think I missed one or two.

You can go smaller tires, too, lol, but I think you covered pretty much everything... It also doesn't remove the speed limiter, only changes it, same goes for the rev limiter...
 
According to the feature chart, the programmer for the '97 us exactly the same, except for not having dual fuel tuning...

I used my Hypertech (for '96-97s only) to change to performance settings and adjust the tire height.  Since I only use 93 octane in my truck anyway, I saw tremendous gains.  However, I didn't mess with the shift points, because I wasn't sure whether I had to specify the RPMs for the shift changes.  Because I didn't do this, it does feel as though it doesn't shift to 4th gear when cruising.  (Why in the name of Pete did they not put a tachometer in my truck?!?  My wife has one!)

Question:  When you tell it to modify shift points, does it do it automatically?  I tend to take a conservative approach when programming the computer, because I'm paranoid about screwing something up.