The easiest way is to drop the car off at a local transmission shop, give them eight hundred dollars and your phone number. If you really need to ask this question the job is over your head.
Check your Automatic Transmission fluid level
according to a local dealer that model has no modulator valve on its automatic transmission sorry !
Drop the pan, replace the filter and gasket, replace the pan and add transmission fluid.
normal atf
700R4
700r4 if its an automatic
should be a C-6
Chrysler torqueflite 727, it is a 3 speed automatic transmission.
If you wish to learn how to rebuild a 1988 Honda Accord automatic transmission, then you should purchase Haynes Repair Manual, 1984 through 1989. You can buy this book at Autozone or www.amazon.com.
Standard or automatic? New or used? With installation? Your location?
There are 4 different options for the type of transmission that came in a 1988 K5 Blazer. They are the 4 speed SM465 manual, the 3 speed TH350 automatic, the 3 speed TH400 automatic and the 4 speed 700R4 automatic.
from the transmission dipstick use some adaptor so you can drop your oild inside.