I have a 93 Chevy 1500 2wd ext cab, 350 auto. It is a 4l60e. I was wanting to put 4.11 in it. How to recalibrate trans? Thanks

 

Have to change the little gears in the tailhousing of the transmission.

 

Where do you get the gears and how do you figure out which ones you need and can I do it myself? Thanks.

 

Crap I just relized that you have a 93 model, that is the first year of the 4l60e in the trucks. You can get an electronic speedo calibrator from like summit or something.

 

Here is what you need. Very easy to install.
http://www.ntwonline.com/acb/showdet...=1973&CATID=15

 

Can it not be changed in the chip?

 

There's a local guy doing a drac module service for $20 dollars shipped. You can ship him your old one after you get the adjusted one. This link shows you basically what's done.
http://www.philter.com/cgi-bin/drac.pl

If you can solder you can do it for cheap. Use this
http://www.cascadesurplus.com/catalo...oducts_id/1107
and the tire sizes are almost limitless.