You will have to get a new intake manifold that will fit a 350 with vortec heads. For the tranny to shift correctly including going into overdrive there is a vacuum kit you can get, but it will only work on some overdrive trannys. A company like Summit should be able to help you with the correct answers. If you can not get a kit for your tranny then you could always locate a 700R out of a earlier model truck.
When was the lasttime you checked your tranny fluid? You might have fried your tranny.
Makes the tranny shift at higher rpms when activated.
a vacum works with the tranny to Shift an automatic vehicle
Inside tranny
i had same problem. what i did is replca the tranny filter and tranny oil, and solve my problem try it. i had same problem. what i did is replca the tranny filter and tranny oil, and solve my problem try it.email me see how you doin -rockandroland117@yahoo.caANSWE ANSWER= shift lockout. some times wheel sensors will go out and the shift lockout will occur to prevent further damage to tranny.
Check your transmission shift solenoids
inside the tranny pan
The tranny slipping
Your band, 1-2, 2-3, and 3-4 shift solenoids are located on the tranny. You have to drain your tranny fluid, remove the pan, and they will be located in the valve body.
the gear shift might just go inside the tranny and shift the gears internally.
If it is on a manual tranny it is the signal for the optimum time for you to shift for best fuel economy.
The shift solenoid on your 1994 Chevrolet Blazer, is located on the top of the transmission. The solenoid will be labeled.