Yes I can explain that.
You'll need a good rolling floor jack.
So this is C20 2 wheel drive is easier than 4wd.
Is your flexplate cracked or missing teeth?
You will need to get the truck on jack stands at least the front. If you have access to a lift even better.
Make sure to block rear tires before jacking front end up.
Next disconnect the negative battery cable.
remove Drive shaft from rear differential, if two piece drive shaft remove center support bearing from cross member. Tape around the rear ujoint to keep ujoint caps on. I tie the drive shaft to frame, keep it out of my ways and from dragging on the ground.
Remove the inspection cover at lower trans bell housing. 4 bolts.
You will see the flex plate and torque converter. Remove torque converter bolts. You will need to turn engine crank shaft to get to all the bolts. I use a 5/8 deep 1/2" drive socket on the center bolt at front of crank, a long handled rachet. 3 or 6 depending on regular or heavy duty. Reach up and push torque converter into trans, should move about 1/4 inch or less.
9/16" swivel socket 3/8" drive with 24"( or more) 3/8" drive extension.
Remove the upper bell housing bolts 4 ea. Remove the dip stick then from underneath remove dip stick tube. Have a drip pan under tube area fluid may leak.
Trans cooler lines. These are 1/2 flair nuts. They can be damaged fairly easy, maybe already. Give them a good look over, you'll need a short 1/2" wrench, and maybe 1/2 flair fitting crows foot. These lines are the worst part of the job, be patient esp when putting them back. Once disconnected the will drain some fluid.
Disconnect shift linkage.
Ok so now you will need 6" long 3/8" by 16 threads per inch bolts 2 ea.
Remove lower 2 bell housing bolts and use the 6" bolts bottom 2 bell housing holes.
Place floor jack under trans use a flat piece of wood to disperse the load.
Remove rear trans mount and cross member.
Now you can slide the trans back @5 to 6 ".
You may need to lower the tail so the bell housing can clear the fire wall.
Keep an eye on your engine fan and radiator shroud, and distributor cap.
You may need to remove cap an loosen shroud.
When you get the trans slid back, you will be able to get to the flex plate bolts. 11/16" socket, you need to hold the motor from rotating. These bolts have 60 ft pds of torque and thread locker. Once removed you will be able to remove old flex plate and install new one. The flex plate only lines 1 way with holes in crank shaft.
Use blue lock tight on bolts torque to 60 ft pds.
Reverse disassemble to put back together.
Note install torque converter bolts finger tight, then go around again remove apply thread lock and torque to 46 ft pds.
Hope this helps if you have questions feel free to ask.
