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John, GMC Technician
Category: GM
Satisfied Customers: 9176
Experience:  ASE MASTER TECHNICIAN/40 years experience
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Why my transmission is kicking between the first and the second gear?

Resolved Question:

why my transmission is kicking between the first and the second gear?
Submitted: 8 years ago.
Category: GM
Expert:  John replied 8 years ago.


Is this a hard shift or is it going back & forth between the gears ?


What is the make,model,year & engine size of your vehicle ?

Customer: replied 8 years ago.

2003,gmc sierra 1500 5,3liters engine z71 model...hard shift between first and second.

the truck kick when the first speed stay engage up to 3000rpm and when she shift to the

second it kick in my back...nothing between 2 and 3 and 3 and 4.

Expert:  John replied 8 years ago.

Usually this condition is caused by a sticking valve in the valve body of the transmission.Here are some more things that can cause it.

Valve Body Assembly (60)

Mislocated valve body to spacer plate checkball or checkballs.
1-2 Shift valve train stuck due to sediment
Gaskets or spacer plate incorrect, mispositioned or damaged
1-2 Accumulator valve stuck or damaged
Face not flat
4-3 sequence valve stuck or damaged
#1 or #8 checkball missing or mis-located
1-2 accumulator valve bushing rotated 180°

2-4 Servo Assembly (13-28)

Apply pin too long or too short
2nd servo apply piston seal missing, cut or damaged
Restricted or missing oil passages
Servo bore in case damaged

2nd Accumulator (55-57, 104)

Porosity in 1-2 accumulator cover or piston
Piston seal or groove damaged
Nicks or burrs in 1-2 accumulator housing
Missing or restricted oil passage
1-2 accumulator piston spring not seated
Rough finish in 1-2 accumulator bore in case
A cracked 1-2 accumulator piston - allowing fluid to leak by

2-4 Band (602)

Worn or mispositioned

Oil Pump Assembly (4) or Case (103)

Faces not flat

Customer: replied 8 years ago.
how to repair ? big job or just changing oil???
Expert:  John replied 8 years ago.
Unless you are familiar I do not suggest you pull the transmission valve body ,find a qualified GM technician.
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