what to do if transmission is kicking into gear in my 93 gmc sierra?

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my transmission is kicking into 2nd gear instead of actually shifting smoothly can any one help me out and tell me whats wrong . the fluid id fine and so is the filter i just changed the tonight
 
my transmission is kicking into 2nd gear instead of actually shifting smoothly can any one help me out and tell me whats wrong . the fluid id fine and so is the filter i just changed the tonight

1-2 shift is delayed and harsh, may not shift into OD: Check TPS (Throttle Position sensor) for smooth and linear electrical response over the entire range of motion. If not, replace. Or your EPC (Electronic Pressure Control) solenoid failed. Easy fix in pan. Fix as soon as possible or hard parts will eventually break.

Put a line pressure gauge (or visit a local trans shop) on the pressure test port and go for a drive to verify proper line pressure. Base pressure at idle in P,N,OD should be around 70psi and around 140psi in R. Max line pressure should be at least 190psi at WOT in 1st or 2nd, 225psi is optimum. If base pressure is low, trans or pump is worn out. If max pressure is low, check EPC solenoid. If reverse is slow to engage, and line pressure does not come up to at least 130psi in reverse, replace the boost valve with a Transgo 0.500" or 0.490"boost valve (easy fix in pan).

Good luck and keep us posted. ;)
 


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