On a 99 chevy z71 the four wheel drive selector buttons lights are on all of them . this affects the transmission shifting. What is the problem?

2wd or 4wd?
learn this first
4l60e is not full spec part number ever, it is ONLY a series class only.
read the ATSG manuals on this box it tells you that in chapter 1.
the list of tranny swaps are endless, (HUGE)
learn that the gear ratio's most be the the same or the TCM will go MAD (chaos)

1. fits bell.mount to engine,
2. same length or 4wd fit up or tail shaft.
3. mounts that same
4. same gear ratios'/
5. same solenoid shift patterns and TCC lockup.
6. and more lots more. really what could be harder to match?????

ask your transmission re-builder this. they have an expensive data base access that answers all this that most never want to disclose. after all why help you buy elsewhere./??? Realty 101

the transmission has sub codes on the side label
THOSE MATTER TOO

If after driving a little bit the 4wd light starts blinking then I believe one (or both) of your HALL sensors are bad or have picked up some metal filings.

I believe the light is blinking because your GEM computer doesn't think both driveshafts are going the same speed.

I think one of your HALL sensors is fooling the GEM into thinking one of the driveshafts is stopped all the time

When you are stopped the computer thinks everything is OK (because the other driveshaft is stopped also)

When you are moving the GEM tries to get both driveshaft spinning the same speed but the sensor isn't responding

It takes 5 minutes to change the rear sensor (you have to cut the old one off and splice in the new one. Sealing the splice with liquid electrical tape)

The front sensor is hardr becasue you have to remove the shift motor on the transfer case

also for the 4wd system there is a TOD(torque on demand relay) that might be bad

Sounds like your transfer case in neutral. You have to engage the transfer case back into gear then shift selector to drive or reverse. When your transfer is in neutral the transmission will not operate. Good luck.

the first thing is to check all your fuses, if fuses are good then you may have a bad switch or a bad selector motor,

the solinoid that opens the and closes the 4 wheel drive is eather stuck or broken

Do you have the push button selector switches or the handle on the floor?

sometimes you have to reverse for it to kick out of four wheel drive. Make sure you put the truck into neutral before you switch out of four wheel drive into two wheel drive. If that doesn't work, your transmission might be sticking.

Sounds like the electronic switch or plunger is going out.

Your blazer is equipped with a shift on the fly four wheel drive. That means that at speeds less than fifteen miles per hour you can shift into or out of four wheel drive by simply pushing the four wheel high button. If you wish to shift into four wheel low. Stop, put the transmission into park or neutral, and push the four wheel low button. Same procedure for shifting back out. Never shift into or out of four wheel low while moving. And be careful in four wheel low. At full throttle your still barely moving, you don't want to blow your engine up!

I had the same problem with my 98 z71, I put the floor shifter in neutral, and let the truck roll backwards a little bit, BE CAREFUL, with the floor shifter in neutral the truck will roll, regardless if the shifter on the steering column is in Park, use caution, make sure there is no one around your truck and you are inside of it and out of the path of doors and tires,