2.2L Automatic S-10

I am going to purchase a 98 2.2L automatic s-10 from my friend, but I have a question about the ECU. Now I want to change the shift points(for example, the truck shifts into the next gear at 3500RPM's and I want it to go higher like 4000RPM's) so my question is,are ther any chips that you plug into the ECU that will higher the shift points.I know the hypertech computer can but they only have it for the 6 cylinder but there are Jet chips and venom chips that you plug into the ECU.

got this from http://store.summitracing.com/default.asp?target=egnsearch.asp&Ntk=KeywordSearch&Ntt=JET-20002S+Jet+Performance+Stage+2+computer+chip%2C+ea ch&x=22&y=13

JET-20002S

Make CHEVROLET
Model S10 PICKUP
Beginning Year 1996 Ending Year 2002
Engine Type L4 Liter 2.2 CID 134 Engine Size 2.2L/134
Engine Family GM 4-cylinder
Transmission Automatic Drivetrain 2WD
Make GMC Model SONOMA
Beginning Year 1996 Ending Year 2002
Engine Type L4 Liter 2.2 CID 134 Engine Size 2.2L/134
Engine Family GM 4-cylinder
Transmission Automatic Drivetrain 2WD