1999 Chevrolet 1500 Pickup Questions

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My rear bumper is rusted. Anyone know are the newer models interchangeable?
service engine light on and blinks every now and then
Speedometer is not working now. Transfer case is 246 gm. Engine is a 5.3. Had code for vss,502 I believe, replaced sensor and cleared code. Need help thanks.

I changed the oil pan gasket and the low oil level lights comes on and the antifreeze looks brown now.
I checked fuses bought new relays replaced switch
My battery light comes on and my security system blinks and it wont start. I have tried the open/close door and turn signal up/down then start, worked once, Lock/unlock door twice, worked once. When I unlock/Lock/Unlock it activates the security system then wont start. The system started blinking while I was driving, it would stop and start again when I hit a bump. Dont know what to do.
My 4x4 switch says I'm in 4 wheel low, I am not. It's in 2 wheel. I've changed the actuator motor twice now, both salvage parts. I've changed the 4x4 switch on the dash board. It still says I'm in 4 wheel low. I've jacked the tuck up, only rear wheels spin, and it goes full speed. Any ideas on where to go from here?
Every so often a loud clanking noise will happen but it's not constant. I have noticed a power loss when goin down the road. could a push rod or a valve cause that?
Before replacing steering column, truck would start just fine. Now I can get any gas to the carburator
as the warning lights come on the tach, speedometer,and guages go down to the bottom. they go to normal quickly. truck keeps running normally. sometimes they flash alot sometimes not at all
almost impossible to get it back out. usually the lights on switch wont work.
Loseing water out the reserve tank. Having to add water every day. No visiable leaks. Replaced the pump and new seal. I do have heat when its turned on. Was told the Heater control valve could be closed shut.but no leaks inside or outside the truck
i also drained about two gal of waterout of my oil pan
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