Need to change the transmission fluid in my 98 corvette

To change your tranny fluid and filter is relativily easy i will tell you step by step here.
1. raise the vehicle and support it with jack stands
2. get a large drain pan
3. locate the transmission oil pand and losen all the bolts removing the rear half of the bolts only and just losening the other bolts to keep the pan held up but allowing it to sag on the rear.
4 be carefull because in this step your likely to get a bath in tranny fluid. insert a flat srewdriver in the back of the pan and carefully pry it lose. now trany fluid is going to pour out of the pan.
5. remove the rest of the bolts be carefull because the trany pan still has a lot of fluid in it.
6. grab ahold of the filter and pull it down.
7. insert the new filter but make sure the rubber gasket came offf with the old filter they have a tendency to stick in the transmission.
8 replace oil pan and torque down evenly
9 refill with correct fluid to the correct level
10 take for a drive and recheck the fluid level and check for transmission fluid leaks
ps when the pan is off clean the inside of it out with brake cleaner really good
If there are no leaks after you get done congratulate your self on a job well done

hope this helps you
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Thank you

You should take it to a shop and have it pressure cleaned with the propper equipment, 1998 corvetts do not have a dip stick to check, unless you have a leak or you just feel it is time to change the trans oil, it is a sealed unit and requires service by a shop or you could get the equipment and open up a shop.