JRed78

I know you've answered this question many times for the newer blazers but mine is a 1990 and doesn't have the electrical buttons to shift to 4x4. My fluid level is fine but it won't go into 4 high... What can I do?

the87hyper

Will it go into 4L and or 4H when in neutral?

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1999 BLAZER ZR2
KENWOOD HEADUNIT KDC-415S
KENWOOD PS-150 AMP
JL AUDIO 10W6
BOSE SPEAKERS 6X9, 4X6
PARNELLI JONES DIRT GRIP 31 X 10.5 X 15
K&N FIPK COLD AIR INTAKE
APC CARBON FIBER TAIL LIGHTS

JRed78

It doesn't go into 4L or 4H at any time. Not in nuetral either.

mrfirebird

i'd start by checking the vacume actuator under the battery,
i just replaced mine today, the transfer case shifted ,but the front wheels didn't enguage. also take a look at the vacume lines going from the servo to the transmission then the switch then the encoder motor.good luck
my bet is on the actuator, make sure it holds a vacume.

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01 F150 Supercrew 4X4
01 F150 4x4 regular cab
67 Honda Superhawk CB77
07 Honda Civic

Rmbodie

I have an 89 , so I know what you are talking about . Can you move the shifter rod , but the light does not glow ? My bulb was blown . My vacuum line was cracked. My actuater was loose under the battery . My switch was wrong on the transfer case . Many things could be off . give me more info please . Rob