ok well doing stand still burny's is rather boring anyway but what ever gets your jollys off.

yes there are ways to change the shift ponts of an automatic tranny. it also depends on the tranny. if it is a 350 or 400 than you will be looking for a stage 2 kit. i had one in my 91 suburban and that thing shifted so hard i s-bent my rear leaf packs and stretched a u-bolt almost 2 inches. than again i also had 4.71's, posi, and 35's.

now what was awsome about that kit is that it would stay in the gear i selected until it hit a certain rpm and than it would shift up to protect the motor from floating the valves to much. that shift point on mine was set to shift about 100 rpm before redline.

so to answer you question yes there are shift kits out there, but atleast be somewhat intellegent and have a safety for yourself, it will save the $500-$800 tranny rebuild bill.

But that is not saying something might be worng and the tranny is shifting way to early anyway. its really hard to tell from just a forum post so....

BTW- the tranny in the burban was a th400, one of the strongest tranny's i have ever seen for an automatic.

nick