I have a 4L60E looking for solenoid 1-2 are they the same for 3-4 as 1-2 ?

Yes, this is universal for 1-2 and 3-4.

my trailblazer wont shift into 3rd or 4th gear, it kick back to a passing high speed instead, will this fix it ?

There is two of these shift seliniods so I would replace both if it was me and there is a torque converter one also, if you have a engine light I would have that checked it should so a transmission code.

Is this what makes the transmission shift hard from 1 to 2 when it is hot is when i noticed it more

If one of the shift solenoids are out it may not be able to shift into all gears. I did have a problem with hard shifting into second gear I used Lucas Transmission fix and have not had any problems since. If you shift solenoid is out it will kick on your engine check light telling you so and which one.

my transmission on 2 nd gear make a slight slip ! do you think its the solenoide?

Im not 100% sure but the solenoide only changes fulid direction to cause the trans to shift. The operation could be sluggish making you think it is slipping.

Manufacturer	ACDelco
Brand	ACDelco
Model	Transmission Control Solenoid
Product Dimensions	10.41 x 10.41 x 9.14 cm; 68.04 g
Item model number	214-1893
Exterior	Painted
Manufacturer part number	214-1893
OEM Part Number	19139323
Item Weight	68 g

ACDelcoProfessional 214-1893 Automatic Transmission Control Solenoid

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