No 4wd high range

Hey Gilbert ,it should be easy sitting in drivers seat all the way forward is 2wd down one is 4wd high next one down is netural and last one down is 4wd low on older cars you may have to roll a little forward and roll a little in reverse to get it to in gauge , the sane when taking it out of 4wd
hope this helped you , good luck
Woody

You shouldn't have to use 4wd to tow a boat out of the water. Does your truck have a 2wd button or just the 4high and 4low button? If you have a 2wd button, put tranny in neutral and then hit the 2wd button. If you just have the 4high and 4low button, put the tranny into neutral then press the 4high button twice (Once to get back into 4high, then again to get out of 4high and back to 2wd).

To Remove:

1. Open the glove compartment.
2. Lift the tab to allow the glove compartment to swing down.
3. Use a flat bladed tool to release the flasher from the harness connector.
4. Remove the flasher.

To Install:

1. Connect the harness connector to the flasher.
2. Secure the flasher with the retainer.
3. Swing the glove box up to the normal position.

For the 1991 Chevrolet S10 Blazer 4.3 V6, Both: 2WD AND 4WD:

Firing Order:
1-6-5-4-3-2

Cylinders:
.......(back).......
|..6..|.......|..5..|
|..4..|.......|..3..|
|..2..|.......|..1..|
......(front)

Distributor:
....(back)
(+).4...3
5...........2
..6...1..(+)-screw
.....(front)

Let me know if this helped, or if you have additional information or questions. Feel Free to contact me at FixYa.com!

this sytem is shift on the fly!! you can engage and disengage from 2wd to 4wd at speeds up to 45-50mph, 4wd lo you need to be a complete stop some cars need to be in neutral with parking brake on and some need to be in gear there all different, consult your owner manual for correct shifting pattern to 4wd lo range

try seeing if the cable going to the front differental is pulling in to engage the front axle?

I had this on my 2002 blazer (4wd 4dr 6cyl) about a year and a half ago. I found two things out. First, have to try shifting out of 4lo while in neutral with foot on the break. It seemed to work better while on a small incline (like waiting to put the boat into the water, not on the ramp but the somewhere shortly before ramp).
I finally decided to try to replace the neutral safety switch after much reading online. It worked and has worked perfectly since then. The shops I took it to told me to put in a whole new motor for about $600. I think I got the safety neutral switch for about 50ish. I have a pit in the garage so it was pretty easy to get under the truck to the transmission and remove the existing switch board. I then just attached the new one and plugged 'er in.
Hope it helps, good luck.

My 4by4 doesn't engage,both lights 4hi and 4low blink for few seconds and then goes back to 2wd and that's it, won't engage 4wd...what should I do?

It should tell you on the Shifter whether or not that you can Shift on the Fly. Check the Manual first if there is one in the Truck. Some Models had this and some Did not. Was an Extra from Factory Option.

Push button 4WD has no neutral option. It is either in 2wd, 4hi, or 4low.